HomeMy WebLinkAboutFooting Instalation For New Schult Homes20201030_23424817 TABLE 6b.LOAD ON FRAME PIER FOOTINGS FOR HOMES NOT REQUIRING PERIMETER BLOCKING EXCEPT AT OPENINGS(LBS)
Roof Load Zone and Max.Home Width(12"Max.Sidewall Eave Overhang)
South(20 psf) Middle(30 psf) North(40 psf)
Pier Spacing 10/20 ft 12/24 ft 14/28/42 ft 16/32/48 ft 10/20 ft 12/24 ft 14/28/42 ft 16/32/48 ft 10/20 ft 12/24 ft 14/28/42 ft 16/32/48 ft
Up to 4' 2300 2624 2948 3191 2540 2904 3268 3541 2780 3184 3588 3891
>4'to 6' 3250 3736 4222 4587 3610 4156 4702 5112 3970 4576 5182 5637
>6'to 8' 4200 4848 5496 5757 4680 5408 6136 6682 5160 5968 6776 7382
>8'to 10' 5150 5960 6770 7378 5750 6660 7570 8253 1 6350 7360 8370 9128
TABLE 6c.LOAD ON FRAME PIER FOOTINGS FOR HOMES NOT REQUIRING PERIMETER BLOCKING EXCEPT AT OPENINGS(LBS)
Roof Load Zone and Max.Home Width(24"Max.Sidewall Eave Overhang)
South(20 psf) Middle(30 psf) North(40 psf)
Pier Spacing 20 ft 24 ft 1 28/42 ft 32/48 ft 20 ft 24 ft 1 28/42 ft 32/48 ft 20 ft 1 24 ft 28/42 ft 32/48 ft
Up to 4' 2420 2744 3068 3311 2700 3064 3428 3701 2980 3384 3788 4091
>4'to 6' 3430 3916 4402 4767 3850 4396 4942 5352 4270 4876 5492 5937
>6'to 8-1 4440 5088 S736 6222 5000 5728 6456 7002 SS60 6368 7176 7782
>8'to 10' 5450 6260 7070 1 7678 6150 7060 7970 1 8653 1 6850 7860 8870 9628
Calculate Loads
Use Table 6d to determine the loads on supports below openings in the sidewall when perimeter
blocking is not required. Find the row with the appropriate opening span. Then,find the column
with the appropriate floor width. The number in the intersecting cell is the load.
TABLE 6d.LOAD ON PIER FOOTINGS AT OPENINGS ALONG THE SIDEWALL(LBS)
Roof Load Zone and Max.Home Width(24"Max.Sidewall Eave Overhang)
South(20 psf) South(20 psf)
Pier Spacing 10/20 ft 12/24 ft 14/28/42 ft 16/32/48 ft 18 ft Pler Spacing 10/20 ft 12/24 ft 1 14/28/42 ft 16/32/48 ft 18 ft
Up to 3' 1025 1100 117S 1244 1306 >5'to 6' 1400 1520 1640 1750 1850
>3'to 4' 1150 1240 1330 1413 1488 >6'to 8' 1650 1800 1950 2088 2213
>4'to 5' 1275 1380 148S 1581 1669 >8'to 10' 1900 2080 2260 2425 2575
Middle(30 psf) Middle(30 psf)
Pier Spacing 10/20 ft 12/24 ft 14/28/42 ft 16/32/48 ft 18 ft Pier Spacing 10/20 ft 12/24 ft 14/28/42 ft 16/32/48 It 18 ft
Up to 3' 1200 1300 1400 1492 1S7S 55'to 6' 1680 1840 2000 2147 2280
>8'to 4' 1360 1480 1600 1710 1810 >6'to 8' 2000 2200 2400 2583 2750
>4'to 5' 1520 1660 1800 1928 2045 >8'to 10' 2320 2560 2800 3020 3220
North(40 psf) North(40 psf)
Pier Spacing 10/20 ft 12/24 ft 14/28/42 ft 16/32/48 ft 18 ft Pier Spacing 10/20 ft 12/24 ft 14/28/42 ft 16/32/48 ft 18 ft
Up to 3' 1375 1500 1625 1740 1844 >5'to 6' 1960 2160 2360 2543 2710
>3'to 4' 1570 1720 1870 2008 2133 >6'to 8' 2350 2600 2850 3079 3288
>4'to 5' 1765 1940 2115 2275 2421 >8'to 10'1 2740 1 3040 3340 1 3615 1 3865
STEP 3. DESIGN FRAME AND PERIMETER SUPPORTS (Homes
With Perimeter Blocking)
DETERMINE LOCATIONS �/
Depending on design and location,some homes require regularly spaced perimeter sup-
ports along all of the sidewalls and marriage walls in addition to frame supports. If required,
perimeter support locations will be identified by labels attached along the bottom of the Spacing frame supports.
sidewalls and marriagewalls and noted on the Data Plate.A pier support will be required at There must be a support
Install Footings
Install Footings
This chapter provides instructions for the design and construction of individual footings that transfer the load from a single pier
to the ground.A footing and pier together(discussed in Set the Home)is referred to as a "support".A footing may also be de-
signed to carry the load of multiple piers (often called "strip"footings). The design of strip footings is not covered in this manual.
However, strip footings are acceptable if designed by a registered engineer or registered architect. The foundation systems
described in this manual have not been designed for flood resistance.
Follow the Steps • - •
STEP 1. DESIGN POINT LOAD SUPPORTS (p. 20)
STEP 2.DESIGN FRAME SUPPORTS(Homes Without Perimeter Blocking)(p, 23)
STEP 3. DESIGN FRAME AND PERIMETER SUPPORTS(Homes With Perimeter Blocking)(p.25)
STEP 4. SELECT FOOTING MATERIALS (p. 30)
STEP 5.SIZE FOOTINGS (p. 31)
STEP 6. INSTALL FOOTINGS (p. 33)
STEP 1. DESIGN POINT LOAD SUPPORTS
All homes will need supports, and therefore footings, under the frame, marriage line (for
multi-section homes),exterior wall openings and other heavy point loads.
All pier locations required at the mating line, perimeter and any special pier support locations,
as required by these instructions,will be identified from the factory by a pier tag, label, paint,
or other means and must be visible after the home is installed. The pier designs, support
loads, and footing construction shall be as indicated in the appropriate diagrams,tables, and
instructions herein. Where perimeter piers are required along the exterior wall, alternate pier
spacing may be used in lieu of the factory identified locations provided the instructions of this
manual are satisfied in terms of allowable spacing, pier design, and footing size.
PLEASE NOTE: The manufacturer will not be responsible for damaged or removed pier tags.
It is the responsibility of the installer to ensure that all piers are properly positioned in accord-
ance with the tables&diagrams contained in these installation instructions.
Create a sketch of the home that includes the exterior walls, the frame I-beams and the
marriage line(s), if a multi-section home. The sketch will be used in this chapter to locate
each support, and note the size of the corresponding footing. Figure 6 is an example of
such a completed support plan.
PERIMETER DOOR PIERS
BLOCKING PIERS
I-BEAM FRAME
MEMBERS Figure 6. Typical point-load
-F- -R- -R- -R- -R- -R- -R-/
support locations
OPTIONAL-- l I I I I I i- 'MARRIAGE
CORNER WALL PIERS
PIERS
$ -B- -S- -6--� � -EI- -- FRAME PIERS
ORC I-BEAM FRAME-j
PORCH POST PIERS
PERIMETER \ I-BEAM FRAME BLOCKING MEMBERS
PIERS
DOOR PIERS—
1
Install Footings
As the location and load for each support is determined, note it on the sketch. When se-
lecting locations for supports, keep in mind that increasing the spacing between supports j
will increase the load on that support and the size of the required footing,
DETERMINE LOCATIONS
Point loads exist where a bearing/structural weight is concentrated and transferred to the
foundation at a specific point. Locate a support under each point load, including the fol-
lowing examples:
• Exterior doors in side walls at both sides of each door(blocking is not required
at exterior doors in end walls supported by the steel header or exterior doors
located in side walls when chassis I-beam spacing is 112"on-center).
• Other exterior wall openings four feet and greater at both sides of each opening
(including multiple windows that total four feet wide or more without intermedi-
ate supports, even if individual windows are less than four feet).
• Marriage line openings four feet or greater at both sides of each opening.
• Locations where through-the-rim crossover ducts penetrate the rim joist at the
marriage line (unless otherwise noted in supplemental documents provided with
the home or unless the home is constructed with a perimeter frame system).
• Marriage line columns.
• Load-bearing porch posts.
• On each side of factory installed fireplaces when located on the exterior side-
walls or marriage walls(except when supported by the steel header).
Adjustable outriggers may be used to replace piers below exterior door or window open-
ings less than 48"and below factory installed fireplaces located on the exterior sidewalls
or marriage walls.Adjustable outriggers may only be substituted if local codes permit the
use of these devices and they are installed according to the manufacturer's installation
instructions. Factory installed outriggers and crossmembers may also replace piers be-
low exterior door or window openings less than 48". Additional factory installed floor
joists may replace piers below openings larger than 48"if noted on other supplemental
documents.
I
Mark the required point load support locations on the sketch. Supports are not required
where the manufacturer has reinforced the floor(such as with additional outriggers or
floor joists)and so noted in the documentation provided with the home.
DOOR OR OPENING LESS
THAN 48 IN.IN WIDTH COMBINED SPAN(A+B)
RIDGEBEAM
1 I T II i COLUMN POST OR WALL I Figure FI 1. T
Il LESS THAN 16 IN.IN WIDTH g ypica point-load
SPAN C ! I >P B SPAN A support locations along the
- marriage line.
IL -fl MAIN
I-BEAM
r__T 4 4 T
FOOTING FOOTING FOOTING FOOTING FOOTING FOOTING
SIZED AND SIZED FOR SIZED AND SIZED FOR SIZED FOR SIZED FOR
SPACED PER SPAN C PER SPACED PER SPAN B PER SPAN A+B SPAN A PER
TABLE 7 TABLE 5 TABLE 7 TABLE 5 PER TABLE 5 TABLE 5
CALCULATE LOADS
Use Tables 5-5c to determine the loads on point load supports(columns). For each support,
find the table with the appropriate section width. Then, find the row with the appropriate roof
load zone and the column corresponding to the span (see Figure 7 for guidance on determin-
ing spans—if a support is shared by spans on both sides, add the respective loads together
to arrive at the total load under that point). The number in the intersecting cell is the load.
Note the required loads next to each point load support on the sketch.
21
II
TABLE Sc.POINT LOAD ON FOOTINGS AT MARRIAGE LINE OPENINGS(LBS)
32 ft Double Section/48 ft Triple Section Max.Home Width
Roof Live Maximum Opening in Marriage Line(ft)
Load(PSF) 4 8 12 14 1 16 18r1711
24 28 32 36 40 44 48
20 1330 2260 3190 3655 4120 4585 5980 6910 7840 8770 9700 10630 11560
30 2880 4120 5360 5980 6600 7220 9080 10320 11560 12800 14040 15280 16520
40 3500 5050 6600 7375 8150 1111 11250 12800 14350 15900 17450 19000 20550
60 4740 6910 9080 10165 11250 12335 13420 15590 17760 19930 22100 24270 26440 28610
80 5980 8770 11560 12955 14350 15745 17140 19930 22720 25510 28300 31090 33880 36670
100 7220 10630 14040 15745 17450 19155 20860 24270 27680 31090 34500 37910 41320 44730
120 8460 12490 16520 18535 20550 22565 24580 28610 32640 36670 40700 44730 48760 52790
• 'w 's• •' m IF • •
STEP 2. DESIGN FRAME SUPPORTS (Homes Without Perimeter
Blocking) /,
DETERMINE LOCATIONS VA
All homes require regularly spaced supports along all main frame 1-beams. Select spacing &*O
between supports and sketch them on the support plan. Keep in mind that frame supports Spacing frame supports.
under homes with 8"deep I-beams may be no more than eight feet apart.Those under There must be a support
homes with 10"or 12"deep I-beams may be no more than 10 feet apart. Generally, greater pier located near the end
distances between supports will require larger footings. Figure 8 shows typical frame sup- of each I-beam such that
port locations, there is no more than 24
inches as measured from
the outside edge of the
floor to the center of the
pier.
DOOR PIERS Figure 8. Typical support
F---- BEAM locations for homes not re-
quiring regularly spaced
� MEMBERS perimeter supports
MARRIAGE WALL PIERS
REQUIRED AT OPENINGS
-- 4 FEET AND LARGER
\\\"'p�V I N I>�,�'
-� -� -0 _E; FRAME PIERS e•'.ee• �,�,�/=
ORC I-BEAM FRAME- � Yo��•F�� �tiCl
ACRICU, URi.,
I-BEAM +
PORCH POST PIERS- FRAME
a v
MEMBERS ,. •ee .nlfr � r��, ,,:.,
DOOR PIERS
I o he. `tom
Install Footings
each of the label locations. Additionally, perimeter support locations may be identified by a pier located near the end
white stripe or mark beneath the home on the bottom board material. Perimeter blocking of each I-beam such that
supports must be placed no further than 8 feet on-center. there is no more than 24
If required, perimeter supports are only needed on bearing walls. For 20 psf roof live load, inches as measured from
perimeter support is only required at exterior doors and other openings 48"and larger, un- the outside edge of the
less noted otherwise. Supports may be added at each corner of each endwall for leveling floor to the center of the
pier.
purposes, but are not required. Bearing walls are those walls that support the ends of roof
trusses or rafters(typically sidewalls and marriage walls but not end walls of main units or
sidewalls of tag units).
To minimize the number of required perimeter supports, space them evenly between point
load supports as shown in Figure 9 and Figure 10(but not under open spans). These fig-
ures identify typical support locations for homes requiring perimeter supports
PERIMETER --DOOR PIERS Figure 9. Typical support lo-
BLOCKING PIERS I-BEAM cations for homes requiring
—r--z---3i� Q---.-�—
FRAME MEMBERS perimeter supports
OPTIONAL— -MARRIAGE
CORNER f" "} is } WALL PIERS
PIERS
r j n n r n n n rl\ FRAME PIERS
ORC I-BEAM FRAME }
B -E- -9-'-E_ -:3-
1 PERIMETER -I-BEAM
PORCH POST PIERS BLOCKING FRAME
PIERS MEMBERS
DOOR PIERS
DOOR OR OPENING LESS
Figure 10. Typical marriage
u ort lc
THAN 48 IN.IN WIDTH COMBINED SPAN A+B line s
homes support for
portrequ locring ations
RIDGEBEAM supports
Ili.,i �� __- ----- -
-COLUMN POST OR WALL,
LESS THAN 16 IN.IN WIDTH
p I SPAN C I ! II SPAN B I SPAN A
_ -MAIN
I I-BEAM -
FOOTING FOOTING FOOTING FOOTING FOOTING FOOTING
SIZED AND SIZED FOR SIZED AND SIZED FOR SIZED FOR SIZED FOR
SPACED PER SPAN C PER SPACED PER SPAN B PER SPAN A+B SPAN A PER
TABLE 7 TABLE 5 TABLE 7 TABLE 5 PER TABLE 5 TABLE 5
CALCULATE LOADS
Use Tables 7-7c to determine the loads on frame and perimeter supports for homes requir-
ing perimeter blocking. Find the chart with the appropriate sidewali eave overhang. Then,
find the column with the appropriate roof load and section width. Find the group of rows cor- A perimeter support must be
responding to the selected support spacing. The values in the intersecting cells are the installed within 4 feet of col-
loads for the frame, perimeter and marriage line supports respectively. umn supports and the corner
of the home when the home is
Loads on supports of a given type(frame, perimeter or marriage) can be assumed to be designated for perimeter
equal if support spacing is equal. However, if different support spacings are used then each blocking. The loads listed in
support with a different spacing should be calculated separately. Tables 5 for homes greater
Loads for piers installed at 5, 7 and 9 feet on-center can be estimated by adding the loads than 20 psf roof load include
w.
w
for the higher and lower spacing and dividing in half(eg. the load for frame piers the additional 4 foot span,
installed at 7 feet on-center for a 16 wide with a 1-1/2"overhang in a 20 psf Roof Load
Zone would be: 2823 Ibs + 3630 Ibs=6453 Ibs/2= 3227 Ibs).
Note the location and load required of each support on the sketch.
(Width listed in each column of the following charts is the overall width of the home. Eg. 16 ft
is a single section, 32 ft is a double section and 48 ft is a triple section).
TABLE 7.LOAD ON FRAME AND PERIMETER PIER FOOTINGS FOR HOMES REQUIRING PERIMETER BLOCKING(LBS)
Roof Load Zone and Max.Home Width 11-1/2"Max.Sidewall Eave Overhang)
Pier South(20 psf) Middle(30 psf) North(40 psf) North(60 psf)
Spacing Location 10 ft 12 ft 1 14 ft 16 ft 1 18ft 30 ft 1 12 ft 1 14 ft 16 ft 1 18ft 10 ft 1 12 ft 1 14 ft 16 ft I is ft 10 ft 12 ft 1 14 ft i 16 ft is ft
Up to 4' Frame 1420 1624 1828 2015 2185 1420 1624 1828 2015 2185 1420 1624 1828 2015 218S 1420 1624 1828 2015 2185
Up to 4' Sidewall 1175 1295 1415 1525 1625 1380 1540 1700 1847 1980 1585 1785 1985 2168 2335 1995 2275 2555 2812 3045
>4'to 6' Frame 1930 2236 2542 2823 3078 1930 2236 2542 2823 3078 1930 2236 2542 2823 3078 1930 2236 2542 2823 3078
>4'to 6' Sidewall 1563 1743 1923 2088 2238 1870 2110 2350 2570 2770 2178 2478 2778 3053 3303 2793 3213 3633 4018 4368
>6'to 8' Frame 2440 2848 3256 3630 3970 2440 2848 3256 3630 3970 2440 2848 3256 3630 3970 2440 2848 3256 3630 3970
>6'to 8' Sidewall 1950 2190 2430 2650 2850 2360 2680 3000 3293 3560 2770 3170 3570 3937 4270 3590 4150 4710 5223 5690
>8'to 10' Frame 2950 3460 3970 4438 4863 2950 3460 3970 4438 4863 2950 3460 3970 4438 4863 2950 3460 39701 4438 4863
Pier North(80 psf) North(100 psf) North(120 psf)
Spacing Location 10 ft 12 ft 14 ft 16 ft 18 ft 30 ft 12 ft 14 ft 16 ft I 18 ft 10 ft 12 ft 1 14 ft 16 ft I 18 ft
Up to 4' Frame 1420 1624 1828 2015 2185 1420 1624 1828 2015 2185 1420 1624 1828 2015 2185
1—upto 4' Sidewall 2405 2765 3125 3455 3755 2815 3255 3695 4098 4465 3225 3745 4265 4742 5175
>4'to 6' Frame 1130 2236 2542 2823 3078 1930 2236 2542 2823 3078 1930 2236 2542 2823 3078
>4'to 6' Sidewall 3408 3948 4488 4983 5433 4023 4683 5343 5948 6498 4638 5418 6198 6913 7563
>6'to 8' Frame 2440 2848 3256 3630 3970 2440 2848 3256 3630 3970 2440 2848 3256 3630 3970
>6'to 8' SidewallJ29SO
4410 5130 5850 6510 7110 5230 6110 6990 7797 8530 6050 7090 8130 9083 9950
>8'to 10' Frame 3460 3970 4438 4863 2950 3460 3970 4438 4863 29SO 3460 3970 4438 4863
IN
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TABLE 7a.LOAD ON FRAME AND PERIMETER PIER FOOTINGS FOR HOMES REQUIRING PERIMETER BLOCKING(LBS)
Roof Load Zone and Max.Home Width(6"Max.Sidewall Eave Overhang)
Pier South(20 psf) Middle(30 psf) North(40 psf) North(60 psf)
Spacing Location 10 ft 1 12ft 1 14ft 16ft 1 18ft 10 ft 12ft 1 14ft 16ft 1 18ft 10 ft 12ft I 14ft 16ft 1 18ft 10 ft 12ft 14ft 26ft I 18ft
Up to 4' Frame 1420 1624 1828 2015 2185 1420 1624 1828 2015 2185 1420 1624 1828 2015 2185 1420 1624 1121 2015 2185
Up to 4' Sidewall 1220 1340 1460 1570 1670 1440 1600 1760 1907 2040 1660 1860 2060 2243 2410 2100 2380 2660 2917 3150
>4'to 6' Frame 1930 2236 2542 2823 3078 1930 2236 2542 2823 3078 1930 2236 2542 2823 3078 1930 2236 2542 2823 3078
>4'to 6' Sidewall 1630 1810 1990 2155 2305 1960 2200 2440 2660 2860 2290 2590 2890 3165 3415 2950 3370 3790 4175 4525
>6'to 8' Frame 2440 2848 3256 3630 3970 2440 2848 3256 3630 3970 2440 2848 3256 3630 3970 2440 2848 3256 3630 3970
>6'to 8' Sidewall 2040 2280 2520 2740 2940 2480 2800 3120 3413 3680 2920 3320 3720 4087 4420 3800 4360 4920 5433 5900
>8'to 10' Frame 29501 3460 1 3970 14438 1 4863 29501 34601 39701 44381 4863 29501 34601 3970 4438 4863 2950 3460 3970 4438 4863
Pier North(80 psf) North(100 psf) North(120 psf)
Spacing Location 10 ft 12 ft 14ft 16 ft 1 18 ft 10 ft 12 ft 1 14 ft 16ft 1 18 ft 10 ft 12ft 1 14 ft 16 ft I 18 ft
Up to 4' Frame 1420 1624 1828 2015 2185 1420 1624 1828 201S 2185 1420 1624 1828 2015 2185
Up to 4' Sidewall 2540 2900 3260 3590 3890 2990 3420 3860 4263 4630 3420 3940 4460 4937 5370
>4'to 6' Frame 1930 2236 2542 2823 3078 1930 2236 2542 2823 3078 1930 2236 2S42 2823 3078
>4'to 6' Sidewall 3610 4150 4690 5185 5635 4270 4930 5590 6195 6745 4930 5710 6490 7205 7855
>6'to 8' Frame 2440 2848 3256 3630 3970 2440 2848 3256 3630 3970 2440 2848 3256 3630 3970
>6'to 8' Sidewall 4680 5400 6120 6780 7380 5560 6440 7320 8127 8860 6440 7480 8520 9473 10340
>8'to 10' Frame 2950 3460 3970 4438 4863 2950 3460 3970 4438 4863 2950 3460 3970 4438 4863
ill! :
IN M,q`
A,111CUg uR
i ��"11,, 'n;ff,�rG�
1
TABLE 7b.LOAD ON FRAME AND PERIMETER PIER FOOTINGS FOR HOMES REQUIRING PERIMETER BLOCKING(LBS)
Roof Load Zone and Max.Home Width(12"Max.Sidewall Eave Overhang)
Pier South(20 psf) Middle(30 psf) North(40 psf) North(60 psf)
Spacing Location 20 ft 24/36 ft 28/42 ft 32/48 ft 20 ft 24/36 ft 28/42 ft 32/48 ft 20 ft 24/36 ft 28/42 ft 32/48 ft 20 It 24/35 ft 28/42 ft 32/48 ft
Up to 4' Frame 1420 1624 1828 1981 1420 1624 1828 1981 1420 1624 1828 1981 1420 1624 1828 1981
Up to 4' Sidewall 1280 1400 1520 1610 1520 1680 1840 1960 1760 1960 2160 2310 2240 2520 2800 3010
Up to 4' Marriagewall 1760 2000 2240 2420 2160 2480 2800 3040 2560 2960 3360 3660 3360 3920 4480 4900
>4'to 6' Frame 1930 2236 2542 2772 1930 2236 2542 2772 1 1930 2236 2542 2772 1930 2236 2542 2772
>4'to 6' Sidewall 1720 1900 2080 2215 2080 2320 2560 2740 2440 2740 3040 3265 3160 3580 4000 4315
>4'to 6' Marriagewall 2440 2800 3160 3430 3040 3520 4000 4360 3640 4240 4840 5290 4840 5680 6520 7150
>6'to 8' Frame 2440 2848 3256 3562 2440 2848 3256 3562 2440 1 2848 3256 3562 2440 2848 3256 3562
>6'to 8' Sidewall 2160 2400 2640 2820 2640 2960 3280 3520 3120 3520 3920 4220 4080 4640 1200 1620
>6'to 8' Marriagewall 3120 3600 4080 444D 3920 4560 5200 5680 4720 5520 6320 6920 6320 7440 8560 9400
>8'to 10' Frame 2950 3460 3970 4353 2950 3460 3970 4353 2950 3460 3970 4353 2950 3460 3970 4353
Pier North(80 psf) North(100 psf) North(120 psf)
Spacing Location 20 ft I 24 ft 28/42 ft 32/49 ft 20 ft 24 ft 28/42 ft 32/48 ft 20 ft 24 ft 28/42 ft 32/48 ft
Up to 4' Frame 1420 1624 1828 1981 1420 1624 1828 1981 1420 1624 1828 1981
Up to 4' Sidewall 2720 3080 3440 3710 3200 3640 4080 4410 3680 4200 4720 5110
Up to 4' Marriagewall 4160 4880 5600 6140 4960 5840 6720 7380 5760 6800 7840 8620
>4'to 6' Frame 1930 2236 2542 2772 1930 2236 2542 2772 1930 2236 2542 2772
>4'to 6' Sidewall 3880 4420 4960 5365 4600 5260 5920 6415 5320 6100 6880 7465
>4'to 6' Marriagewall 6040 7120 8200 9010 7240 8560 9880 10870 8440 10000 11560 12730
>6'to 8' Frame 2440 2848 3256 3562 2440 2848 3256 3562 2440 2848 3256 3562
>6,to 8' Sidewall 5040 5760 1 6480 7020 6000 6880 7760 8420 6960 8000 1 9040 1 9820
>6'to 8' Marriagewall 7920 9360 10800 11880 9520 11280 13040 14360 11120 13200 15280 16840
>8'to 10' Frame 2950 3460 3970 4353 2950 3460 3970 4353 2950 3460 3970 4353
IN M'
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Install Footings JA
TABLE 7c.LOAD ON FRAME AND PERIMTER PIER FOOTINGS FOR HOMES REQUIRING PERIMETER BLOCKING(LBS)
Roof load Zone and Max,Home Width(24"Max.Sidewall Eave Overhang)
Pier South(20 psf) Middle(30 psf) North 140 psf) North(60 psf)
Spacing Location 20 ft 24/36 ft 28/42 ft 32/48 ft 20 ft 24/36 ft 28/42 ft 32/48 ft 20 ft 24/36 ft 28/42 ft 32/48 ft 20 ft 24/36 ft 28/42 ft 1 32/49 ft
Up to 4' Frame 1420 1624 1828 1981 1420 1624 1828 1981 1420 1624 1828 1981 1420 1624 1828 1981
Up to 4' Sidewall 1400 1520 1640 1730 1680 1840 2000 2120 1960 2160 2360 2510 2520 2800 3080 3290
Up to 4' Marriagewall 1760 2000 2240 2420 2160 2480 2800 3040 2560 2960 336D 3660 3360 3920 4480 4900
>4'to 6' Frame 1930 2236 2542 2772 1930 2236 2542 2772 1930 2236 2542 2772 1930 2236 2542 2772
>4'to 6' Sidewall 1900 2080 2260 2395 2320 2560 2800 2980 274D 3040 3340 3565 3580 4000 4420 4735
>4'to6' Marriagewall 2440 2800 3160 3430 3040 3520 4000 4360 3640 4240 4840 5290 4840 5680 6520 7150
>6'to 8' Frame 2440 2848 3256 3562 2440 2848 3256 3562 2440 2848 3256 3562 2440 2848 3256 3562
>6'to 8' Sidewall 2400 2640 2880 3060 2960 3280 3600 3840 3S20 3920 4320 4620 4640 5200 5760 6180
>6'to 8' Marriagewall 3120 3600 4080 4440 3920 4560 5200 5680 4720 5520 6320 6920 6320 7440 8560 9400
>8'to 10' Frame 2950 3460 3970 4353 1 29501 3460 3970 4353 1 2950 1 3460 3970 4353 1 2950 3460 1 3970 4353
Pier North(80 psf) North(100 psf) North(120 psf)
Spacing Location 20 ft 24 ft 29/42 ft 32/48 ft 20 ft 24 ft 28/42 ft 32/48 ft 20 ft 24 ft 28/42 ft 32/48 ft
Up to 4' Frame 1420 1624 1828 1981 1420 1624 1828 1981 1420 1624 1828 1981
Up to 4' Sidewall 3080 3440 3800 4070 3640 4080 4520 4850 4200 4720 5240 5630
Up to 4' Marriagewall 4160 4880 5600 6140 4960 5840 6720 7380 5760 6800 7840 8620
>4'to 6' Frame 1930 2236 2542 2772 1930 2236 2542 2772 1930 2236 2542 2772
>4'to 6' Sidewall 4420 4960 5500 5905 5260 5920 6580 7075 6100 6880 7660 8245
>4'to 6' Marrlagewall 6040 7120 8200 9010 7240 8560 9880 10870 8440 10000 11560 12730
>6'to 8' Frame 2440 2848 3256 3562 2440 2848 3256 3562 2440 2848 3256 3562
>6'to 8' Sidewall 5760 6480 7200 7740 6880 7760 8640 9300 8000 9040 10080 10860
>6'to 8' Marriagewall 7920 9360 10800 11880 9520 11280 13040 14360 11120 13200 15280 16840
>8'to 10' Frame 2950 3460 1 3970 1 4353 1 2950 3460 3970 4353 2950 1 3460 1 3970 4353
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STEP 4. SELECT FOOTING MATERIAL '/i •�.00 •� .-.0•\,```.
Select one of the products and materials from Table 8 for the footings. OFl. l `\��
TABLE 8. FOOTING MATERIALS
Material Appropriate Use Specification
Minimum 6"thick poured-in-place concrete pads,slabs,or ribbons with at least a
Poured concrete All soil types 28 day compressive strength of 3,000 psi.Cast-in-place concrete footings may also
require reinforcing steel based on acceptable engineering practice,the design
loads,and site specific soil conditions.
Minimum 4"thick nominal precast concrete pads meeting or exceeding ASTM C
Pre-cast concrete All soil types 90-02a, Standard Specification for Load Bearing Concrete Masonry Units,without
reinforcement,with at least a 28 day compressive strength of 1,200 psi
Per Pad Manufacturer's Use in accordance with the pad manufacturer's instructions.Must be certified for
ABS plastic Instructions use in the soil classification at the site,listed or labeled for the required load capac-
ity. May be placed directly on soil or concrete.
Proprietary systems Consult system manufac- Consult system manufacturer
turer
;�J
_
i
TYPICAL FLIFLOOR
Figure 12. Perimeter sup-
JOIST —
F� Fir ports
EXTERIOR
WALL-`
WOOD WEDGES
' PRESSURE TREATED
HARDWOOD 4x4 OR T
CAP BLOCK 2x4's NAILED TOGETH
ON EDGE.MUST SPAN
FLOOR RIM—� MINIMUM OF TWO FLO
JOIST JOISTS.--—-
10"MAXIM
SETBACK
EDGE OF
BLOCKS PARALLEL WITH EDGE OF FLOOR BLOCKS PARALLEL AND RECESSED BACK
FROM EDGE OF FLOOR
• If footings are rectangular, orient them so that the long side is perpendicular to
the home's I-beam.
• Place the bottom of footings on undisturbed soil or fill compacted to at least
90%of its maximum relative density. Excavation. If
• In freezing climates protect footings from the effects of frost heave in accord- excavation is required, mark
ance with any LAHJ requirements (see Prepare the Site, p. 15). Place the bot- the footing locations on the
tom of the footings below the frost line. Insulated foundations or other frost pro- ground with stakes before
tection options are acceptable when designed by a registered engineer or reg- beginning to dig.
istered architect. Monolithic slabs are allowed above frost depth when de-
signed by a registered engineer or registered architect to resist the effects of
frost heave. Anchorage requirements must be included with each registered
engineer or registered architect design when the anchorage requirements
listed in this manual cannot be accommodated. Prior to obtaining an alternative
design contact the home building facility for available approved alternative de-
signs or instructions for submitting an alternative design.
• Make sure the top surface of the footing is level, flat and smooth.
- -
TABLE 10. FOOTING DIMENSIONS Note:
Pier Soil Bearing Capacity(PSF) Round To calculate a square or rectan-
Capacity Required FootingArea(square inches Footer aular footer:
Ibs 1000 1500 2000 2500 3000 4000 Diameter
1000 144 _ 128 _ _ 128_ izg izs 128 Length(in)x Width(in)=Area
1200 173 128 128 128 128_ 128
140_0 202 134 128 128 128 128 Example:
1600 230 154 128 128 128 128
1800 259 173 130 128 128 128 16 in x 20 in=320 sq. inches
2000 J432
192 144 128_ 128_ 128
2200 �211 158 _128 128 128 To calculate a round footer:
2400 230 173 _138 _128 128
2600 250 187 150 128 129
2800 269 202 161 134 128 3.14 x.25 x Diameter(in)x Di-
3000 288 216 173 144 128 ameter(in)=Area
3100 446 298 223 179
3200 461 307 230 �184 154 128 Example: For a 22"diameter
3300 __475 317 238 _19_0_ _ 158 128 _ footing
3400 490 326 245 196 163 128
3500 504 336 252 202 168 129 3.14 x.25 x 22 in x 22 in=380
3600 518_ 346 259 _207 173 130 sq. inches
3700 _ 533_ 355 266 213 _ 178 _ 133 1
3800 547 365 1 274 219 182 137 8
3900 562 374 281 225 187 140
4000 576 384 288 230 192 144 i
4100 _590 394 295 236 197 _148 n
4200 605 403 302 242 202 251 c
4300 619 423 310 248 206 155 _ h
4400 634 422 317_ 253 211 158
4500 648 432 324 259 216 162
4600 662 442 331 265 221 166
4700 677 451 338 271 226 169
4800 691 461 346 276 230 173
4900 706 _470 353 282 235 _ 176 _
5000 720 480 360 288 240 1 ^180
5200 749 499 374 300 250 187_
5400 778 518 389 311 259 _ 194
5600 806 538 403 323 269 202_
_ 5800 835 557 418 334 278 209
6000 864 576 432 346 288 216
6200 893 595 446 1 357 298 223
6400 922 614 _4_61 369 307 230__
6600 950 634 _49475__ 380 317 __238
6800 979 653_ 0_ 392 326 _ 24_5_
7000 1008 1 672 504 403 336 _ 252 1
7200 1037 1 691 ___518__ 415 346 259 U�N MM�
7400 1066 710 533 426 355 266 G :.••4
7600 1094 730 547 438 365 274 `��\ .• (Z � F `'•
7800 1123 749 562 , 449 374 281 2 `� •5 C/
8000 1152 768 576_ _461 384 288 m
8500 1224 816 612 490 408 306 4
9000 1296 864 _648 _5_18 �432 324 ; AGRICU t
9500 1368 912 _ 684 __547 _456 342
48
10000 1440 960 720 576 _ 0 360 n . O'er•�2" !! wW
10500 1512 1008 756 605 504 378 c
11000 1584 1056 792 634 528 396 h '/��`• (� �a •° ��'
12000 1728 1152 864 691 _576_ 432
12500 1800 1200 900 720 600 450 7�1;;t; ' , �1�•
13000 1872 1248 936 749 624 _ 468
13500 1944 1296 972 778_ 648 486 3
14000 2016 1344 1008 806 672 504 0
14500 2088 1 1392 1044 835_ 696 522 I
15000 2160 1440 1080 864 720 540
MOO2232 1488 1116 893 744 558 n
11010 2314 1536 1152 922 768 576
InsI .
Will i
I
footingsbeconcrete?
1110- YES, •. . STEP 5, SIZE FOOTING,
0, NO, see footing systen, manufacturers instructions, then go to Set
STEP 5. SIZE FOOTINGS
Once the load on the footing and the soil bearing capacity are known, calculate the size
of each footing as follows:
1. From Table 9 determine if the pier is to be of single stack blocks (8 inch x16
inch)or double stack blocks (16 inch x 16 inch).
2. Locate the group of columns in Table 10 with the soil bearing capacity deter-
mined in Prepare the Site, STEP 5. DETERMINE SOIL BEARING CAPACITY
AND FROST LINE (p. 17). Use the next lowest value if the exact value does
not appear.
3. Find the row corresponding to the pier capacity required by Tables 5, 6 or 7.
Then, read across the table to determine the minimum required footing area for
the corresponding pier capacity and soil bearing capacity.
4. The required footing size and pier capacity may be changed by selecting differ-
ent support spacing.
TABLE 9. PIER CONFIGURATION
Pier Con- Maximum load(Ibs)
figuration Height Configuration Without With
Mortar Mortar
Single Single stack blocks with long side
Stack Less than 36 in* perpendicular to frame I-beam or 6,500 7,680
parallel to perimeter rail(rim joist)
Double 67"Max. Double,interlocked blocks 13,000 15,36D
Stack
Triple Stack 67"Max. Triple,interlocked blocks 19,500 23,034
Double 108"Max.** Double,interlocked blocks NA 39,500
Reinforced
*Single stack piers may be constructed up to 54"max. height only when installed as pe-
rimeter and marriage line support piers.
** Cross reference maximum allowable pier height with maximum floor height listed in
frame tiedown charts. If maximum height listed in frame tiedown charts is exceeded then
designs must be provided by a registered professional engineer or registered architect.
s • �
S AGRlC E
� e �
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'' .010 °it•� ��
//r�/0lllt�l ;�\``
Design footings to comply with the following additional requirements:
• To keep footings directly under I-beams and other support points, size them
slightly larger than the minimum required area to allow slight adjustment of the
pier location during home installation.
• Design footings with a footing extension (projection beyond the base of the
pier) no greater than the footing thickness(Figure 11). Increase footing thick-
ness if necessary.
Figure 11. Maximum footing
_ extensions
18"BLOCK
- I- i —L---- 4" I
FOOTING EXTENDS' EXTENDS BY TYP1 18' 4" 118' NO
YES BY ITS THICKNESS NO MORE THAN ITS 12W' 18"
OR LESS THICKNESS YES- 45
18"BLOCK
4"
4" TYP i 124" 45
SPLIT FOOTING SPLIT FOOTING TYP: 32
YES EXTENDS LESS NO EXTENDS MORE PRECAST OR POURED FOOTER
THAN ONE THIRD THAN ONE THIRD WHICH EXTENDS PAST ALLOWABLE
ITS WIDTH ITS WIDTH PROJECTION MAY NOT BE
INCLUDED IN FOOTER AREA
• The footing sizes shown are for square pads and are based on the surface ar-
ea (square inches) Design non-square footings such that the area and thick-
ness is equal to or greater than the area of the square footing shown in Table
10 and the distance from the edge of the pier to the edge of the footing is not
more than the thickness of the footing. Footers may be either 4-inch precast or
poured or a combination of both with a combined thickness complying with the
requirements of Table 10A.
TABLE 10A. FOOTER THICKNESS
Poured in Place Footing for Poured in Place Footing for !`�.� RQ fi "•..• `'i•,�
Single Stack Pier Double Stack Pier ;r.` •Gj „-XyP �C/
Min.Footer Max Footer Min.Footer Max Footer ,_;
A
Max.
hickness Dimension Max. Area
ax.Area . BICU UR'
Thickness Dimension .''
(in) (in x in) (sq.in) (in) (in x in) (sq.in)
6 28 x 20 560 6 28 x 28 784
8 32 x 24 768 $ 32 X 32 1024Iz-
�'' •+• '�� i1f'�' r,C.. la°� w
10 36 x 28 1008 10 36 x 36 1296 �i, �" Cr"�°U•::.� \��
12 40 x 32 1280 12 40 x 40 1600
14 44 x 44 1936
16 48 x 48 2304
STEP 6. INSTALL FOOTINGS
Construct the footings as follows:
• Maintain the distance between adjacent piers to within 10% of the tabulated
spacing and so the average distance between piers is equal to or less than the Placing Concrete anchors.
tabulated spacing. If anchors will be placed in
• Whenever possible, place pier supports directly under the required locations. If concrete follow instructions
plumbing, electrical or mechanical equipment interferes, place supports no in Install Stabilizing Sys-
more than 6 inches in either direction of the support point. tem (p. 74)to determine
• Recess perimeter pier supports no more than 10 inches from the edge of the anchor layout. Either place
floor with added support as shown in Figure 12. anchors immediately after
the concrete has been
poured or drill them in after
the concrete has set.
O FETiERAI M1AWK At 1tW-A D
(.)WXJSW C0NSTW TVA4'U
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Q 07
m _
7/25/2008
4 Foundation System
Installation In tns for Wind Zone 1, E
By Tie Dow
Updoted:sreio
• Easy installation 1- p
o� F o
• Stabilizer plates and diagonal frame tie :
are not required in most set-ups
• Longitudinal stabilization is easily added Q
with Tie Down's LSD strut kit.
• Heavy galvanized coating* on bracket - ...
and struts. ~�
REQUIREMENTS V
• Install in any type of soil,
4B(175-275 lbs.) or better.
• Maximum vertical projection at sidewall
is 9'. Higher walls may be used when the r-
design loads are adjusted accordingly. w "
• Main rail spacing must he 75.5" - 99.5" y.
• Additional vertical anchor ties that are Xi2
unique to a home's design may be required
by the home manufacturer. These locations Ground Oystetn y ,
may include shear walls, marriage line ridge (For Block or Steel Pier)
beam support posts, and rim plates. The
longitudinal component of the Xi2 system
replaces end frame ties. Check manufacturers
set-up requirements. =
• Maximum pier height is 48". _ -.,:, .
• Systems must be placed as evenly as
possible, no more than 10'from end of home.
• Additional systems may be needed for roof r"^
slopes greater than 20 degrees, (4.37"in 12'
Pitch ) See Page 4. Xi2 Ground System
• Two systems designed to work in conjunction with Longitudinal Stabilization
with each other. (One Strut for Wind Zone l
• Wind Zones 11 &III requires sidewall anchors. Two Struts for Wind Zones rl&in)
Check manufacturers requirements.
Xi2 components exceed HUD code 3280.307g 'Anchoring equipment exposed to weathering shall have a
resistance to weather deterioration at least equivalent to that provided by a coating of zinc on steel of not
less than 0.30 ounces per square foot of surface coating...."
TIE r •WN ENGINEERING * 5901 WheatonDrive r
www.tiedown.comI rrlr r r 1 TI
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Installation of Lateral System a Of m
1 Identify the number of systems to be used on the home using the chart above. 7/25/2008
2. Identify the location where the lateral systems will be installed.
3. Clear all organic matter and debris from the pad site.
4. Place pad centered under beam with the lateral strut bracket towards the inside of the home.
5. Press or drive pan into ground until level and flush with prepared surface.
6. Build pier according to State, Local or Home Manufacturers guidelines.(Figure 1)
7. Attach the end of the smaller tube to the inside of pan using Ubolt& nuts provided
8. Attach the flag end of the larger tube to the opposite I-beam using the "J" bolt over the top of the I-beam
with the nut & washer provided. (Figure 2)
9. Install a minimum of four(#12 x 1"tek screws) self-tapping screws into the holes provided in the lateral strut so
that the two tubes are connected together. (Figure 1)
1-3/4"Tube J-801t Nut A Washer
\ c
Figure 1 \, Lateral Strut& ,C
. Strut
1-1/2"Tube (flag end)
4.#12 x I"
Tek Screw.,
U•Boit d mounting I-Beam
Bracket -`i_ % Figure 2
Xi2 Lateral Stabilization Pier Placement
30' • •
Anchor'
a 1 I
Xi?■—"
Placement 1
1 � I
3rd Svs—tern" • • 1 R 1 n
1 I
for Placement
Single Section Home-WZ 1& II Double Section Home-WZ I& 11 Triple Section Home-WZ I& II
0-76'Box 2 Xi2 Systems 0-76'Box 2 X12 Systems 0-76 Box 2 Xi2 Systems
Over 76'Box 3 Xi2 Systems Over 76'Box 3 Xi2 Systems Over 16'Box 3 Xi2 Systems
.................................... ....... ._....... .__.. ...... .. .. . . ...... ... ............. ..........................................................................I...........
Single Section Home-WZ III Double Section Home-WZ III Triple Section Home-WZ III
0-64'Box 2 Xi2 Systems 0-64'Box 2 Xi2 Systems 0-64'Box 2 Xi2 Systems
Over 64 Box 3 Xi2 Systems Over 64'Box 3 Xi2 Systems Over 64'Box 3 Xi2 Systems
For Wind Zone I.30"anchor w/ve►fical strap or frame tie w/stabilizer plate, within 10'of end of home on single sections.
NOTE: Diagram represents single section up to 16'v.idth.double section up to 32'width.
and triple section homes up to 48'width
TIE n�
Ch
I •WN ENGINEERING - 5901 WheatonI30336
www.tiedown.comf / 111 1 • I . 1 / l
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Installation of Longitudinal Struts w 7/2-5/2008
Longitudinal stabilization can be combined economically with the Xi2 Lateral System.Combining LSD struts with
the pad for the lateral system saves time and material costs. When combining the lateral and longitudinal systems,
use the placement directions for the lateral system.
Installation of Longitudinal Struts
mg 1. Identify the number of systems to be used on the
d °f N° home using the chart below,
Clear all organic matter and debris from the pad site.
3. Place u-bolt though holes provided. Attach lock
washers on u-bolt, on the top side of pan
4. Press or drive pan into ground until level and flush
with prepared surface.
;r 5. Build pier according to State. local or Home
w": Manufacturers guidelines.
o! 6. Install frame bracket clamps to I-beam on in
side of block/pier. Do not tighten nuts at this time.
7 Insert u-bolt through mount bracket, attach with nut
and bolt. Do not tighten at this time.
rj 8. Insert strut in the frame bracket clamp, attach with
��— nut and bolt. Do not tighten at this time.
9. Pull the frame bracket clamp with the fastened strut
kk outward to remove any slack,
`-' 10.Tighten all nuts and bolts on the struts and
beam clamps.
Xi2 Longitudinal Pier Placement
■ r r � r
XI2 System
Placement
a
r r r
Use One Strut(per end)
For WZ I
Single Section Double Section Triple Section
7r Up to 16' Nominal Up to 32' Nominal up to 48' Nominal
Use Two Struts(per end)
For W2 II & III When pier with LSD struts is used only as longitudinal stabilization, systems must be
as evenly spaced as possible, no more than 10'from the end of the home.
TIE DO5901 Wheaton Drive - Atlanta GA, 30336 '.
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Number of Xi2 Systems Required for Roof Pitches r;r.
Higher than 20 degrees /
712� 20()R
Module Wind Zone I Wind Zone II Wind Zone III
Length
(Feet) 5:12 6:12 7:12 9:12 5:12 6:12 7:12 9:12 5:12 6:12 7:12 9:12
34 2 2 2 2 2 2 2 2 2 2 3 3
36 2 2 2 2 2 2 2 3 2 2 3 3
38 2 2 2 3 2 2 2 3 2 3 3 3
40 2 2 2 3 2 2 2 3 3 3 3 3
42 2 2 3 3 2 2 3 3 3 3 3 3
44 2. 2 3 3 2 2 3 3 3 3 3 3
46 2 3_ 3 3 2. 3 3 3 3 3 3 4
48 2 3 3 3 3 3 3 3 3 3 3 4
50 3 3 3 3 3 3 3 3 3 3 3 4
52 3 3 3 3 3 3 3 3 3 3 4 4
54 3 3 3 3 3 3 3 3 3 3 4 4
56 3 3 3 3 3 3 3 3 3 3 4 4
58 3 3 3 3 3 3 3 3 3 3 4 4
60 3 3 3 3 3 3 3 3 3 3 4 5
62 3 3 3 3 3 3 3 3 4 4 4 5
64 3 3 4 4 3 3 4 4 4 4 4 b
66_ 3 3. 4 4 3 3 4 4 4 4 4 5
as 3 4 4 4 3 4 4 4 4 4 5 5
70 3 4 4 4 3 4 4 4 4 4 5 5
72 3 4 4 4 4 4 4 5 4 4 5 5
74 4 4 4 5 4 4 4 5 4 5 5 5
76 4 4 4 5 4 4 4 5 4 5 5 6
78 4 4 4 5 4 4 4 5 4 5 5 6
80 4 4 4 5 4 4 4 5 4 5 5 6
Xi2 Ground System
Part z�59306 00
Includes: 5'Strut, pad & hard,.^pare. Lp O
Longitudinal Stabilization Hardware Kit -
Part r,59331 .3
Includes: 2 I-beam brackets& 2 U-bolts
with all nuts and bolts. Xi2 Ground System
Part�59306
Struts for Longitudinal Stabilization
Part No. Strut Length Pier Height Up To: o C
59330-30 30" 2 Blocks or 18" P fL J+
59330-39 39" 3 Blocks or 24" Longitudinal
•
59330-44 44" 4 Blocks or 32' • Stabilization
59330-53 53" 5 Blocks or 40' , '�' -.--�� Hardware Kit
59330-65 65" 6 Blocks or 48' � _ � i Part59331
:t
TIE DOWN ENGINEERING - 5901 Wheaton Drive Atlanta GA, 30336 j L;
www.fiedown.com r . . . 0rrr r . I40 II a.
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