HomeMy WebLinkAbout20-4743 198 South Hills Rd, #43 - Mfd Home City Approved Plans _4
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PROVIDE TIE DOWN, PADS, PIERr ,
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10 HOME INSTALLATION STANDARDS.
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PROVIDE STEPS PER '
IRC CODE. PROVIDE
HANDRAILS IF MORE 0
THAN 4 RISERS.
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Reviewed for Code Compliance
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PLANS MUST BE ON JOB SITE
FOR ALL INSPECTIONS
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03. Elevation. The underside of the floor of all manufactured homes installed in designated 100 year
flood hazard areas shall be a minimum of twelve inches(12") above the flood elevation to resist flotation,
collapse, or lateral movement
04. Underfloor Enclosures. Notwithstanding the requirements of Section 703, manufactured homes
installed in designated flood hazard areas shall have the underfloor enclosure foundation vents located
within twelve inches (12")vertically of the finished grade.
NOTE: The following information on FEMA is not adopted as part of this standard but referenced in this
standard for the convenience of the user.
Federal Emergency Management Agency (FEMA). In addition to the state's minimum standards for
elevating manufactured homes in flood hazard areas,44 CFR, Chapter 1, Section 60.3(c) (6) (iv) of the
Federal Emergency Management Agency (FEMA) regulations, requires all manufactured homes in
designated flood areas to be elevated to resist flotation, collapse, and lateral movement during the base
flood. For additional up-to-date information of FEMA requirements, programs, or insurance contact:
a. State Coordinator
Dept. Of Water Resources
322 E Front St, Boise, ID 83702
(208) 287-4800 CITY APPROVED PLANS
b. Federal Emergency Mgmt. Agency Reviewed for Code Compliance
Federal Regional Center PLANS MUST BE ON JOB SITE
130-228th St. SW
Bothell,Washington 98021-9796 FOR ALL INSPECTIONS
306. EGRESS REQUIREMENTS.
01. Egress. Upon completion of installation, and prior to occupancy, each manufactured home shall
conform with the following requirements:
a. Each egress door on a manufactured home shall be accessible by stairs, a ramp, or a deck.
b. Windows and doors shall be adjusted, secured in place, and made operational to provide
security, egress, and to minimize air leakage and water penetration.
c. Damage to windows and doors which affect their safety features, thermal performance, or
operation shall be repaired or replaced.
d. Each manufactured home shall have an underfloor access provided and constructed according
to Section 704.
02. Inspection Approval. Installations shall not be approved until a means of access has
been provided to each of the two required exit doors on the manufactured home.
03. Stairs. At set-up and prior to occupancy, stairs which meet or exceed the following standard, shall
be provided at each egress door in accordance with the current version of the Idaho Residential Code
as adopted and amended by the Idaho building code board (2012 IRC section R311.7). See Figure 306.1
2S
Page 2 of 17
04. Permanent Construction Requirements. All permanent ramps, steps, stairways, railings, decks,
porches, and landings shall be constructed and installed according to Section 1006.
307. --399. RESERVED.
NOTE:
PROVIDE SECURE ATTACHMENT TO
BUILDING TO PREVENT HORIZONTAL 30" MAX W/O GUARD RAILS
MOVEMENT GUARD RAILS REQ'D OVER 30"
10" MIN TREAD —I 3'-0"
USE REDWOOD OR PRESSURE
TREATED WOOD WITHIN 6" i
OF GRADE 1
r7 3/4" MAX RISER jTYPj
S
r
STAIRS
FIGURE 306.1
CITY APPROVED PLANS
Reviewed for Code Compliance
PLANS MUST BE ON JOB SITE
FOR ALL INSPECTIONS
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Page 3 of 17
CHAPTER 4 CITY APPROVED PLANS
Reviewed for Code Compliance
STANDARD SET INSTALLATION STANDARDS. PLANS MUST BE ON JOB SITE
FOR ALL INSPECTIONS
401. GENERAL.
This Chapter prescribes the installation requirements that specifically apply to standard set homes. See
Figure 301.1.
01. Content: This series of sections prescribes requirements for:
a. The support pier system for standard set manufactured homes; and
b. Tie down anchoring;
02. Frost Line. Manufactured homes on a standard set are not required to have support footings below
the frost line. However, perimeter blocking must be installed in a manner,and skirting or other approved
fascia material must be installed, to minimize the effects of frost.
402. APPROVED INSTALLATION MATERIALS AND COMPONENTS.
01. Footings. Pier support footings shall be a minimum of two hundred fifty-six (256) square inches and
not less than the width of the pier being supported. Ridge beam column support footings shall be sized
according to Subsection 403.03.b. Footings shall be any one of the following, except where specifically
stated otherwise.
a. Precast Pads. One (1) or more precast concrete pads with a nominal size of sixteen inches
by sixteen inches (16" x 16") by four inches (4") thick or two (2) or more pads with a nominal
size of eight inches by sixteen inches (8" x 16") by four inches (4") thick. Eight inch by sixteen
inch (8" x 16") pads may be used only with concrete block piers. The pier blocks shall be
perpendicular to the joint of the pad. See Figure 402.1.
b. Poured Concrete Pads. Nominal four inch (4") or thicker poured-in-place individual concrete
pads, either square or round. See Figure 402.2.
c. Lumber or Polymer Stacked Pads. Pads of two (2) to four (4) layers of two inch (2") nominal
size thick foundation grade lumber, pressure treated on all six sides, or pads of two to four layers
of two inch (2") nominal size thick polymer composite. Each layer shall be laid perpendicular to
the layer below it. See Figure 402.3.
d. Lumber Pads. Pads of one layer of two inch (2") nominal size thick foundation grade lumber
pressure treated on all six sides. If used with concrete piers, the grain shall be parallel with the
long side of the block with no more than one inch (1") of wood exposed beyond the long sides
of the block. See Figure 402.4.
e. Plywood Pads. Pads of one (1) piece of one and one-quarter inch (1-1/4") thick plywood
pressure treated on all six sides or pads of two stacked pieces of three-quarter inch (3/4") thick
plywood pressure treated on all six sides. See Figure 402.5.
27
Page 4 of 17
f. Runners. Continuous concrete runners with a thickness of six inches (6") and not less than
eighteen inches (18") wide [twenty inches (20") wide under the marriage line] with two (2)
continuous three-eighths inch diameter (#3) reinforcing bars. The reinforcing bars shall be
centered vertically in the runner, ten inches (10") apart and shall not be closer than three inches
(3")from the edge.The runner shall be centered beneath the mainframe. See Figure 402.6.
These runners may be poured wide enough to include the outer mainframe and perimeter
supports,or the inner mainframes and marriage line supports, on the same runner. If runners are
poured wide enough to include two or more rows of supports two (2) continuous three-eighths
inch diameter (#3) reinforcing bars shall be used for each row of supports. The reinforcing bars
shall be centered vertically in the runner, spaced equidistant apart, and shall not be closer than
three inches (3") nor farther than six inches (6")from the edge.
g. Other. Prefabricated pads or other equivalent materials when tested, listed, and labeled by
a nationally recognized testing and listing laboratory, or designed by an Idaho Licensed
Professional Engineer.
02. Block Piers. Concrete block piers shall be placed on approved minimum two hundred fifty-six (256)
square inch (or sized as required for ridge beam column supports) footings and shall not exceed the size
of the footing. Block piers shall be capped and shimmed with approved components. Piers shall be:
a. Concrete block. The blocks shall be either open or closed cell precast lightweight concrete of
nominal size of eight inches by eight inches by sixteen inches (8" x 8"x 16"). Open cell blocks shall
be positioned vertically. See Figure 402.7. Cinder or pumice blocks shall not be used.
(1) Single Stack. Block piers up to thirty-six inches (36") high under the main frame or
marriage line and forty-eight inches (48") high under the perimeter walls may be single
stacked. Single stacked block piers shall be placed perpendicular to the main frame and
marriage line and parallel at the perimeter wall. Single stack piers shall be placed
perpendicular to the joint of two(2)eight inch by sixteen inch (8"x 16") nominal size concrete
pads. See Figure 402.1.
(2) Double Stack. Block piers over thirty-six inches (36") high under the main frame and
marriage line, and over forty-eight inches (48") high under the perimeter walls, shall be
double stacked with blocks interlocking. See Figure 402.8.
(3) Maximum Height. No concrete block piers shall be constructed over eighty inches (80")
in height unless designed by an Idaho Licensed Professional engineer.
(4) Capacity. Single stack block piers shall be used for loads not to exceed five thousand
(5,000) pounds. Double stack block piers shall be used for loads not to exceed sixteen
thousand (16,000) pounds. Double and single piers may be combined for higher loads.
03. Block Pier Caps. Each block pier shall be capped with a pier cap equal in area to the pier blocking(i.e.,
8"x 16"or 16"x 16").See Figures 402.7,402.8,and 402.9. Pier caps shall be one or more of the following.
a. Precast Block.A solid concrete block with a nominal thickness of four inches (4").
CITY APPROVED PLANS
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PLANS MUST BE ON JOB SITE
Page 5 of 17 FOR ALL INSPECTIONS
I
PLACE BLOCK PERPENDICULAR
TO JOINT ON(2)4 X 16 PADS TYPICAL PIER BLOCK
/ 3 5/8"MIN
21 bier
' 1"MAX TYPICAL 2"X 10"X 28"
MIN 256 SQ.INCH CONCRETE (NOMINAL 1-1/2"X 9-1/4"X 27-5/8")
BLOCK FOOTING[(2)8"X 16"X 4"(NOMINAL) MINIMUM 256 SQUARE INCH SINGLE
OR(1)16"X 16"X 4"ATSM G90-96 LAYER WOOD FOOTING PRESSURE
TREATED ON ALL SIX SIDES
PRECAST CONCRETE PIER PAD SINGLE LAYER WOOD PIER PAD
FIGURE 402.1 FIGURE 402.4
i
MINIMUM 256 SQUARE I i
INCH POURED IN PLACEJI
CONCRETE FOOTING 1-1/4"MIN
2".MINIMUM ABOVE GRADE /
OPT.USE(2)LAYERS
- EQUAL TO 1-12"MIN
E:�>INIMUM 256 SQUARE INCH PLYWOOD FOOTING
MIN PRESSURE TREATED ON ALL SIX SIDES
NOTE:FIELD TREATMENT OF CUT EDGES
IS NOT ACCEPTABLE
POURED CONCRETE PIER PAD WOOD PIER PAD
FIGURE 4022 FIGURE 402.5
TYPICAL PIER BLOC
I 18"MIN
20"MIN.@ M.L.
/ 3"MIN 10"MIN 3"MIN
1 1/2" 1 12"
/ MIN MIN REB
, MIIa MINIMUM
6'MI 6 N,�N 2"MINIMUM v v v a
ABOVE GRADE CONTINUOUS POURED IN PLACE
MIN 256 SQUARE INCH TWO LAYER WOOD FOOTING WITH MINIMUM 2500 PSI
FOOTING WITH LAYERS PERPENDICULAR TO IN 28 DAYS
EACH OTHER AND PRESSURE TREATED ON
ALL SIX SIDES OR MAY BE SUBSTITUTED
WITH WOOD-POLYMER COMPOSITE
DOUBLE LAYER WOOD PIER PAD CONTINUOUS CONCRETE FOOTING
FIGURE 402.3 FIGURE 402.6
CITY APPROVED PLANS
Reviewed for Code Compliance 29
PLANS MUST BE ON JOB SITE
Page 6 of 17 FOR ALL INSPECTIONS
1"X4"X8"
WOOD WEDGES
SHOWN
-ALTERNATE
` DIRECTION
8"X8"X16"
OPEN CELL
4"X16"X16"
PRECAST
CONCRETE
PIER CAP
SHOWN
8"X8"X16"
PRECAST DOUBLE
INTERLOCKED
PIER BLOCKS
SINGLE 4"X 16"X 16"PRECAST
CONCRETE FOOTINGS OR OTHER TYPICAL 256 SQUARE INCH
APPROVED FOOTINGS MATERIAL PRECAST CONCRETE FOOTING
(TYPICAL) TYPICAL DOUBLE
STACK
TYPICAL CONCRETE BLOCK PIER C(_)NCRETE BLOCK PIER
FIGURE 402.7 FIGURE 402-8
TYPICAL MAIN
1"X 4"X 8" FRAME TYPICAL PAAIN
WOOD WEDGES i FRAME
SHOWN
-ALTERNATE i
2"X 6"X 16"
DIRECTION It
i WOOD SHIMS
SHOWN
4"X 16"X 16" ADJUSTABLE
PRECAST TYPICAL _
CONCRETE PIER SCREW
RE FABRICATED PIER i
CAP SHOWN SHALL NOT BE
PIER BLOCK -TESTED,LISTED, OVER-EXTENDED
(TYPICAL AND LABELED (SEE PIER
(12 MIN MINIMUM 4000 LBS
8"X 8""X 16" INSTRUCTIONS)"
36"MAX PRECAST CAPACITY)
- CONCRETE PIER TYPICAL
BLOCKS SHOWN) CONCRETE
4"X 16"X 16" FOOTING
SHOWN
PRECAST
CONCRETE
FOOTING SHOWN
TYPICAL BLOCK PIER DETAIL TYPICAL PREFABRICATED PIER
FIGURE 402.9 FIGURE 402-10
CITY APPROVED PLANS
Reviewed for Code Compliance 30
PLANS MUST BE ON JOB SITE
Page 7 of FOR ALL INSPECTIONS
b. Plywood. One (1) piece of one and one-quarter inch (1-1/4") thick plywood, or two (2)
pieces of three-quarter inch (3/4")thick plywood.
c. Lumber. One (1)two inch (2") nominally thick Number 2 (#2) or better grade lumber.
d. Polymer. One (1)two inch (2") nominally thick wood polymer composite.
e. Other. Listed or equivalent materials when tested, listed,and labeled by a nationally recognized
testing and listing laboratory, or designed by an Idaho Licensed Professional Engineer.
04. Block Pier Shims. Where shim material is used between the top of the pier cap and the bottom of
the main frame,the shimming material shall not exceed five inches (5") vertically. See Figure 402.9. Pier
shims, when used, shall be one or more of the following;
a. Precast Concrete. Two inch (2")thick solid concrete blocks equal in area to the pier cap;
b. Plywood.Three-quarter inch (3/4") or thicker plywood equal in area to the pier cap;
c. Lumber. Two inch (2") nominally thick Number Two (#2) or better grade lumber not less than
five and one-half inches (5-1/2") in width and sixteen inches (16") long;
d. Polymer. One and one-quarter inch (1-1/4") minimum thickness wood polymer not less than
five and one-half inches (5-1/2") in width and sixteen inches (16") long; or
05. Block Pier Wedges. No more than two sets of wedges three-quarter inch (3/4") thick or one set of
wedges one and one-half inches (1-1/2") thick by three and one-half inches (3-1/2") wide by eight
inches (8") to sixteen inches (16") long may be used. They must be fitted perpendicular with, and driven
tight to, the bottom of the main frame or floor to transfer loads uniformly to the pier. See
Figures 402.8 and 402.9.
06. Prefabricated Piers. Prefabricated piers shall be placed on approved footings and shall not exceed
the size of the footing. See Figure 402.10. Piers shall be:
a. Tested and Listed. All prefabricated piers shall be tested, listed, and labeled for a capacity of
not less than four thousand (4,000) pounds. See Subsection 303.02.
b. Instructions. The installation of the piers shall be in compliance with pier manufacturers'
instructions which shall be left with the home.
c. Shims. No shims shall be used with a prefabricated pier.
d. Adjustable Heads. All piers shall be of the type fitted with an adjustable head and nut. The
adjustment shall not exceed that permitted by the manufacturer's instructions.
07. Other piers. Other piers may be used when tested, listed, and labeled by a nationally recognized
testing and listing laboratory, or designed by an Idaho Licensed Professional Engineer.
CITY APPROVED PLANS
Reviewed for Code Compliance
PLANS MUST BE ON JOB SITE
Page 8 of 1m,I
FOR ALL INSPECTIONS
403. INSTALLATION SUPPORT REQUIREMENTS.
01. Main Frame Supports. The main frame of all standard set manufactured home installations shall be
supported as prescribed in the following Subsections. See Figure 403.1. All materials and components
shall comply with the requirements of Section 402.
PERIMETER ---
0 0 0 0 0 0 0
Ly
MAIN FRAME SUPPORTS '
RIDGE BEAM COLUMN SUPPORTS
MARRIAGE LINE RINI
JOIST SUPPORTS
PLRINiLTER SUPPORTS
0 0 0 0 0 0 0
LOCATED WITHIN 6 INCHES OF CORNER AND 8 FT O.C.
0 PERIMETER FOR ROOF LOAD UP TO 30 PSF;6 FT O.C. FOR 40 PSF;
SUPPORTS 4 FT O.C. FOR 80 PSF; FOUNDATIONS FOR 100 PSF AND OVER
® MAIN FRAME LOCATED WITHIN 12 INCHES OF EACH END
SUPPORTS AND 6 FT O.C. FOR ALL ROOF LOADS
❑❑ RIDGE BEAM LOCATED WITHIN 6 INCHES OF EACH END
SUPPORTS AND AS REQUIRED AND MARKED BY THE MANUFACTURER
MARRIAGE LINE LOCATED 8 FT O.C. FOR ALL ROOF LOADS 30 PSF AND GREATER
® RIM JOIST EXCEPT WHEREVER THERE IS A WALL ABOVE THE MARRIAGE LINE
SUPPORTS THEN SUPPORTS SHALL BE LOCATED 6 FT O.C. FOR 40 PSF:4 FT O.C.
FOR 60 PSF . 3 FT O.C. FOR 80 PSF.2 FT O.C. FOR 100 PSF OR OVER.
STANDARD SET SUPPORT SYSTEM
FIGURE 403.1
a. Footings for Standard Sets. The footings for the support piers under the main frames of a
standard set manufactured home shall be any of the footings in Subsection 402.01.The minimum
size shall be two hundred fifty-six(256) square inches.
b. Piers. The piers for the support of main frames in standard sets shall be any of
piers in Subsections 402.02, 402.06, or 402.07. When block piers are used they shall be placed
perpendicular to the main frame. Open cells shall be vertical.
CITY APPROVED PLANS
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32
PLANS MUST BE ON JOB SITE
Page 9 of 01 FOR ALL INSPECTIONS
c. Location of Supports. The footings and pier stands under the main frame shall be placed not
more than twelve inches (12") from the ends of the frames. The footings and pier stands shall
continue to be set six feet (6) on center the full length of the frame. A six inch (6") variance is
allowable to clear obstructions. This spacing shall be maintained in all roof loads up to and
including one hundred twenty pounds per square foot (120 psf).
d. Piers. The piers for the support of main frames in standard sets shall be any of the piers in
Subsections 402.02, 402.06, or 402.07. When block piers are used they shall be placed
perpendicular to the main frame.
e. Location of Supports. The footings and pier stands under the main frame shall be placed not
more than twelve inches (12") from the ends of the frames. The footings and pier stands shall
continue to be set six feet (6) on center the full length of the frame. A six inch (6") variance is
allowable to clear obstructions. This spacing shall be maintained in all roof loads up to and
including one hundred twenty pounds per square foot (120 psf).
02. Perimeter Supports. The perimeter side walls of all manufactured homes sections over twelve feet
(12')in width shall be supported as prescribed in the following Subsections.See Figure 403.1. All materials
and components shall comply with the requirements of Section 402.
a. Perimeter Footings for Standard Sets. The footings for the support piers under the perimeter
side walls of a standard set manufactured home shall be any of the footings in Subsection 402.01.
The minimum footing size shall be two hundred fifty-six (256) square inches. Footings shall not
extend beyond the exterior perimeter walls of the manufactured home.
b. Perimeter Piers for Standard Sets.The piers for the support under the perimeter side walls of
a standard set manufactured home shall be any of the piers in Subsections 402.02, 402.06, or
402.07.(1) All piers must be installed on approved footings which meet the requirements of
Subsection 402.01. Perimeter blocking can be parallel. Where double stacks are used check with
manufacturer's specifications or refer to Figures 402.8 and 402.9.
(1) Block piers are required if the footing is constructed of eight inch by sixteen inch
by four inch (8" x 16"x 4") precast pads.The pier blocks must be placed perpendicular to
the joint of the pads. See Figure 402.1.
(2) When it is not possible to install a perimeter pier directly under the exterior sidewall,
the floor shall be supported by a four inch (4") wide by six inch (6") high nominal size or
equal horizontal Number Two (#2) or better grade wood beam, spanning a minimum of
three floor joists and supported by an approved pier recessed not more than ten inches
(10")from the perimeter.See Figures 403.2 and 403.3.When wood wedges are used with
the beams, they shall be installed at each end of the block pier between the top of
the pier and the bottom of the beam. Block piers shall be placed perpendicular to the
floor joists.
(a) Exception: In homes with longitudinal joists and where the third joist is above
or inside the main frame beam, the pier support beam shall span a minimum of
two joists.
CITY APPROVED PLANS
Reviewed for Code Compliance
PLANS MUST BE ON JOB SITE 13
Page 10 of 11
FOR ALL INSPECTIONS
NOTE: NOTE:
WHEN WOOD WEDGES ARE USED WITH WOOD WHEN WOOD WEDGES ARE USED WITH WOOD
SUPPORT BEAMS THEY SHALL BE INSTALLED SUPPORT BEAMS THEY SHALL BE INSTALLED
AT EACH END BETWEEN THE TOP OF THE AT EACH END BETWEEN THE TOP OF THE
PIER SHIM AND THE BOTTOM OF THE PIER SHIM AND THE BOTTOM OF THE
HORIZONTAL BEAM HORIZONTAL BEAM SUPPORT BEAM SHALL SPAN
3 JOISTS MIN.AND SHALL BE
TYPICAL SKIRTING SUPPORT BEAM SHALL SPAN TYPICAL SKIRTING OF#2 OR BETTER GRADE
WALL INSTALLED 3 JOISTS MIN.AND SHALL BE WALL INSTALLED LUMBER(2)2"X 6"OR
PER MFR. OF#2 OR BETTER GRADE PER MFR. (1)4"X 6"
RECOMMENDATIONS LUMBER(2)2"X 6"OR RECOMMENDATIO _WEDGES FROM 1"X 4"X 8"
(1)4"X 6" ALTERNATE WEDGE DIRECTION
\ l t
\ 4"X 8"X 16" PRECA T
CONCRETE PIER CAP
10"MAX 8"X 8"X 16" PRECAST 10"MAX 4"X 8"X 16"PRECAST
CONCRETE PIER BLOCKS CONCRETE PIER CAP
"X 8"X 16"PRECAST
CONCRETE PIER BLOCKS
PRESSURE 4"X 16"X 16" 4"X 16"X 16"
TREATE CONCRETE FOOTING CONCRETE FOOTING
PLATE ^ /2
PRESSURE TREATED PLATE
PERIMETER PIER PERIMETER PIER
W/TRANSVERSE JOISTS W/ LONGITUDINAL JOISTS
FIGURE 403-2 FIGURE 403.3
TYPICAL 4"X 16"X 16" ,,
PAD SPANNING PADS
BELOW
TYPICAL 4"X 16"X 16"
PAD SPANNING PADS
BELOW
TYPICAL 4"X 16"X 16" `
FOOTING PADS
TYPICAL 4"X 16"X 16"
FOOTING PADS
512 SO IN PIER PAD 1024 SO IN PIER PAD
(5000 POUND CAPACITY.) (11,000 POUND CAPACITY)
FIGURE 403.4 FIGURE 403.5
CITY APPROVED PLANS
Reviewed for Code Compliance
PLANS MUST BE ON JOB SITE 34
Page 11 of 01
FOR ALL INSPECTIONS
(3) Where a manufactured home has cantilevered portions and expanded rooms,these protrusions shall
be supported by piers at each corner and along the cantilevered portion of the sidewall perimeter.
c. Location of Supports. Footings and pier stands under the perimeter side walls shall be located
as prescribed below.
(1) Six inches (6") or less from each corner.
(2) Eight feet(8')on center maximum for roof loads from thirty to forty pounds per square
foot(30 to 40 psf)or per original manufacturers standards.Thirty pounds per square foot
is the minimum permissible snow load rating in Idaho. Exception — Open floor not
carrying weight.
(3) Six feet (6') on center maximum for roof loads over forty and up to sixty pounds per
square foot(41 to 60 psf).
(4) Four feet (4') on center maximum for roof loads over sixty and up to eighty pounds
per square foot (61 to 80 psf).
(5)A sixteen inch (16")variance is allowable to clear obstructions.
03. Marriage Line Supports. The marriage line rim joists and ridge beam columns of all standard set
multi-section manufactured homes shall be supported as prescribed in the following Subsections. See
Figure 403.1. All materials and components shall comply with the requirements of Section 402.
a. Marriage Line Rim Joist Supports.The entire marriage line shall be supported by minimum two
hundred fifty-six (256) square inch footings and piers. See Subsections 402.01, 402.02, 402.06,
or 402.07.
b. Ridge Beam Column Supports. Marriage line roof ridge beam column supports shall comply
with the requirements prescribed in the following subsections.
(1) The manufacturer shall identify in a diagram the load on, and the location of, each
column. The diagram shall be provided to the homeowner, and upon request, to the
dealer, installer, and local authority having jurisdiction.
(2) The manufacturer shall clearly mark the location of each column.These markings shall
remain visible for inspection after the installation is completed.
(3) The installer shall use the manufacturer's diagram and markings to determine
locations and loads of column supports.
(4) The installer shall use Table 400-A to determine the size of footing required for each
column load.
(5) Footings for marriage line roof ridge beam support columns shall be constructed
according to any one of the following four methods.
CITY APPROVED PLANS (a) Multilayered sixteen inch by sixteen inch by four inch (16" x 16" x 4") precast
concrete pads placed in a pyramid shape to distribute the load from the pier to the
Reviewed for Code Compliance
PLANS MUST BE ON JOB SITE 35
FOR ALL INSPECTIONS
Page 12 of 17
base. See Figures 403.4 and 403.5. Each layer of blocks shall span at least fifty percent
(50%) of each block in the layer beneath.
(b) Poured in place concrete pads a minimum of eight inches (8") nominal thickness
with two (2)three-eighths inch diameter(#3) reinforcing bars in each direction.
(c) A poured concrete footing runner a minimum of eight inches (8") nominal
thickness by twenty inches (20") wide with two properly positioned three-eighths
inch (#3) reinforcing bars. See Subsection 402.01.f.
CITY APPROVED PLANS
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PLANS MUST BE ON JOB SITE
FOR ALL INSPECTIONS
Table 400-A
Footing Size Capacity Footing Size Capacity
(Inches) (Pounds) (Inches) (Pounds)
15 x 15 2,500 29 x 29 8,500
17 x 17 3,000 30 x 30 9,000
18 x 18 3,500 31 x 31 10,000
20 x 20 4,000 32 x 32 11,000
21 x 21 4,500 34 x 34 12,000
22 x 22 5,000 35 x 35 13,000
23 x 23 5,500 37 x 37 14,000
24 x 24 6,000 38 x 38 15,000
25 x 25 6,500 39 x 39 16,000
26 x 26 7,000 40 x 40 17,000
27 x 27 7,500 42 x 42 18,000
28 x 28 8,000 43 x 43 19,000
The footing sizes shown are for square pads and are based on the area (square inches) required for the
load. Other footing configurations, such as a rectangular configuration, may be used, provided the area
(square inches) is equal to or greater than the area of the square footing shown in the table. For
example, a 12-inch x 22-inch (264-square-inch) footing may be used in place of a 16-inch x 16-inch (256-
square-inch) footing. Also,two 12-inch x 24-inch pads may be used in place of one 24-inch x 24-inch
pad.
(d) Pads of two to four layers of minimum two inch by ten inch (2"x10") nominal size
lumber pressure treated on all six sides.The length of the pad shall not exceed double
the width. The boards in each layer shall be laid crosswise to the boards in the layer
beneath.
c. Piers. Marriage line piers shall be concrete block or listed prefabricated piers.See Subsections
402.02 and 402.06. All ridge beam columns with a load in excess of five thousand pounds (5,000
36
Page 13 of 17
lbs. shall have multiple blocked concrete piers or prefabricated piers listed and labeled to support
the load either by itself or in combination with another pier.
d. Location of Supports. Marriage line supports shall be located as prescribed below. See Figure
403.1.
(1) On a standard set the first support will be the first ridge beam column support,which
shall be within six inches (6") of each end.
(2) Ridge beam column supports shall be sized and located per the diagrams supplied by
the manufacturer for each home and Table 400-A.
(3) Marriage line rim joist supports shall be located along the entire length of the
marriage line as prescribed below.
(a) Eight feet (8') on center maximum for roof loads from thirty to forty pounds per
square foot (30 to 40 psf) or per original manufacturer's standards wherever there is
a bearing wall above the marriage line.Thirty pounds per square foot is the minimum
permissible snow load rating in Idaho.
Exception—Open floor not carrying weight
(b) Six feet (6') on center maximum for roof loads over forty and up to sixty pounds
per square foot (41 to 60 psf) wherever there is a bearing wall above the marriage
line.
(c) Four feet(4')on center maximum for roof loads over sixty and up to eighty pounds
per square foot (61 to 80 psf) wherever there is a bearing wall above the marriage
line.
(d) Three feet (3') on center maximum for roof loads over eighty and up to one
hundred pounds per square foot (81 to 100 psf) wherever there is a bearing wall
above the marriage line.
(e) Two feet (2') on center maximum for roof loads over one hundred pounds per
square foot (100 psf)wherever there is a bearing wall above the marriage line.
(f) As an alternate support system to that specified in (d) and (e) above, a marriage
line pony wall may be constructed of minimum two inch by six inch (2" x 6") nominal
size studs, twenty-four inches (24") on center, with double top and single (treated)
bottom plates to support the marriage line. A four inch by six inch (4" x 6") nominal
size post shall be placed in this pony wall at all ridge beam support locations identified
by the manufacturer.All wood shall have a structural rating equal to,or greater than,
#2 SPF.
(g) Ridge beam column supports may be considered to be rim joist supports as long
as the maximum allowable spacing between supports is not exceeded.
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04. Height of Installation. No more than twenty-five percent(25%) of the main frame pier supports of a
manufactured home shall exceed thirty-six inches (36") in height without prior approval of the local
authority having jurisdiction. Pier heights shall be measured from the top of the footing to the bottom
of the frame. See Figure 402.9. Maximum pier height shall not exceed eighty inches (80"). See Figure
402.8.
404. ANCHORING.
01. Anchoring. To resist lateral movement from high winds,earthquakes,and flooding,all manufactured
homes shall be anchored down.
02. Loads. Anchoring equipment including all anchors, straps, and tension devices used to secure a
manufactured home when installed, shall be capable of resisting an allowable working load at least equal
to or exceeding three thousand one hundred-fifty pounds (3,150 lbs.) and shall be capable of
withstanding fifty percent (50%) overload (4,725 lbs.) without failure of either the anchoring equipment
or the attachment point to the manufactured home. When the stabilizing system is designed by a
qualified Idaho Licensed Engineer, alternate working loads may be used, provided the anchoring
equipment is capable of withstanding a fifty percent (50%) overload. Each type of anchor suitable for the
purpose of this standard shall meet the following criteria.
a. Each anchor shall be certified and listed as to its resistance against pulling based on the
maximum angle of diagonal or vertical tie loading and the angle of anchor installation and the
type of soil in which the anchor is to be installed.
b. Anchors designed for the connection of multiple ties shall be certified and listed as being
capable of resisting the combined working load and overload consistent with the intent expressed
herein; and shall be installed to resist resultant forces.
c. Each anchor shall be selected based on the soil class at the depth where the anchor will be
installed.
d. Each anchor shall, at a minimum, be installed to the full depth shown in the anchor
manufacturer's installation instructions. The retainer or stabilizer plates shall be installed to
achieve the required ground anchor resistance capacity. See Figure 406.1.
e. The load carrying portion of the anchor shall extend below the frost line.
03. Installation Instructions.Anchor manufacturers shall provide manufacturer's installation instructions
for all listed and approved anchoring systems sold in Idaho. Anchor manufacturer's installation
instructions shall be consistent with the product listing and approval. One copy of the anchor
manufacturer's instructions must be made available to the inspectors of the local authority having
jurisdiction.
a. Caution: Before installing ground anchors, the site shall be checked for marked and
unmarked underground utilities.
04. Testing.Anchoring devices shall be tested to one and one-half(1.5)times the horizontal wind load of
fifteen pounds per square foot (15 psf) and a roof uplift of nine pounds per square foot (9 psf) using the
test procedures in the current version of ASTM D-3953.
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MAIN FRAME BEAM ANCHOR STRAP 7 �— FLOOR JOIST
TIE DOWN—,
STRAP
4"X 16"X 16" TO ANCHOR
1 PRECAST
CONCRETE —MAIN FRAME
6"MAX IN
PIER CAP SHOWN STRA FROM EDGE BUCKLE
PIER
OF FLOOR t7zy, L
CONCRETE NOTE:
FOOTING STRAPPING
DE
\//\ //\\IV\/ STEEL WITH ZIiNC COATING APPLIED IAT
\ ALTERNATE GROUND
.80 OZ. PER FOOT AS PER ASTM 03953-87
/
WITHANCH SOTABILIZER PLATE R LOCATION
ALTERNATE STRAPPING SYSTEM MAY
\\�\\\�\\� BE USED UPON PRIOR APPROVAL BY
�9 A►�� �/�i THE DIVISION OF BUILDING SAFETY
HAIN FRAME TIE-DOWN
FRArJE TIE DOWN DETAIL STRAP CONNECTION
FIGURE 406, 1 FIGURE 406.2
05. Ties.All tie strapping shall be fastened to anchors and drawn tight with adjustable tensioning devices
supplied with the anchor.
a. Tie strapping shall be certified and listed to be capable of resisting an allowable working
load of three thousand one hundred-fifty pounds(3,150 lbs.)with no more than two percent(2%)
elongation and shall withstand a fifty percent (50%) overload.
b. Ties shall connect the anchor to the main frame I-beams which run lengthwise under the
manufactured home. Ties shall not connect to steel outrigger or cross member beams which
fasten to, and intersect with, the main frame I-beams.
c. Tie materials shall be designed to prevent self-disconnection when ties are slack. See Figure
406.2 &3.
06. Spacing. Unless otherwise specified in the anchoring equipment manufacturer's installation
instructions, anchoring devices shall be installed on both sides of the manufactured home with a
maximum spacing of eleven feet(11') on center and no more than two feet (2') from each end.
07. Certification. Anchoring equipment is certified when tested, listed, and labeled by a nationally
recognized testing and listing laboratory, or designed by an Idaho Licensed Professional Engineer.
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08. Alternate anchoring systems. Alternate anchoring systems may be used when tested, listed, and
labeled by a nationally recognized testing and listing laboratory, or designed by an Idaho Licensed
Professional Engineer.
09. Used anchor systems. Used anchor system may be used if meeting manufacturers specifications and
in combination with new straps.
405. --499. RESERVED.
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