The following items shall be completed during
the interconnection of multisection homes when the manufacturer's
installation instructions are not available.
A.
Provide an air infiltration barrier on the matting
edges of the floor, end walls and ceilings.
B.
If accessible, fasten the roof at the ridge with No.
10 by four-inch wood screws, at a minimum, at twelve-inch, on center,
staggered intervals. If the ridge is not accessible use .027 minimum
thickness metal straps across the ridge to connect each of the opposing
structural members.
C.
Secure end walls with No. 10 by four-inch wood screws,
at a minimum, at six-inch, on center, staggered intervals. Fasten
floors together at the mating line with No. 10 by four-inch wood screws,
at a minimum, at twelve-inch, on center, staggered intervals.
D.
Mating walls shall be firestopped in accordance with
the MHCSS.
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Normal Home Installations
(Single or Multisection Homes)
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|---|---|---|
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Types of Foundation Systems - Main Components
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Piers-Ground anchors: The manufactured
home rests on piers of concrete block; formed-in-place concrete; permanent
wood; or steel pedestals on permanent wood, crushed stone or concrete
footers. The ground anchors in the soil are angled to the resist straps
or embedded in dead-men in the soil. Straps are tied to the frame,
with or without over-the-top straps.
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Concrete slab or continuous footings: The manufactured home rests on a concrete slab or ribbons of concrete.
The straps are tied between the frame and the perimeter footers or
concrete slab.
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Pile/post system: The manufactured
home rests on piles or posts placed sufficiently deep in the ground
to resist all wind, snow and earthquake forces. Straps fasten the
home to the piles or posts or to caps placed thereon.
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Concrete, concrete block or wood foundation,
load-bearing, perimeter walls: The manufactured home rest on
exterior load-bearing walls that sit on concrete or gravel footings.
Straps fasten the home to the walls to resist all external forces.
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After blocking and leveling, the installer should
secure the manufactured home against the wind. The type of installation
is the determining factor in deciding how this should be done, as
is described in the following sections.
A.
Normal installations. Section 156-16 summarizes and defines the types of normal installations. The pier-and-ground-anchor system, as provided in this chapter, is most common. When using another type of installation, consult a registered engineer. (NOTE: The anchoring or foundation system shall be capable of meeting the loads required by the MHCSS.)
(1)
Number and location of anchors. The number and location
of straps and anchors is determined by the size of the home. The anchors
shall be spaced not more than two feet zero inches from each end of
the home and not more than 11 feet zero inches apart unless the anchor
manufacturer specifies a greater spacing. Use either the single- or
the double-strap method. Use only approved ground anchors capable
of resisting at least 4,725 pounds.
(2)
Installation of anchors. The following is one example:
Install the anchors at the locations selected from Figure 5-2[1] when the home manufacturer's installation instructions
are not available. Follow the anchor manufacturer's instructions.
Use single-headed anchors at all "frame-tie-only" locations when using
the single-strap method, and double-headed anchors when employing
the double-strap method. Install single- or double-headed anchors
at all over-the-roof-tie locations. When using a single strap, line
up the shaft of each anchor with its strap (see Figure 5-3[2]). When connecting more than one strap to a single anchor,
line the shaft of the anchor with the results achieved by calculating
the combined forces (see Figure 5-4[3]). The ground anchors must be sized for the direction of
the load and the type of soil. (See Figures 5-3 and 5-4 for additional
information of the installation of anchors and tiedowns.)
[1]
Editor's Note: Figure 5-2 is included at the end of this chapter.
[2]
Editor's Note: Figure 5-3 is included at the end of this chapter.
[3]
Editor's Note: Figure 5-4 is included at the end of this chapter.
B.
Over-the-roof straps. If over-the-roof straps are
provided with the home, they must be installed.
C.
Severe climatic conditions.
(1)
Freezing. Be sure anchor augers are installed below
24 inches below grade. During periods of frost heave, be prepared
to lessen tension on the straps.
(2)
Areas prone to flooding. Foundation considerations are discussed in § 156-15A and the FEMA document referenced in Appendix A. Unconventional anchorage and tie-downs often are needed in designing and constructing and special elevated foundations required in areas prone to flooding. Consult an engineer and the Kent County Department of Inspections and Enforcement for guidance.
Site-constructed porches must be constructed
and inspected according to the CABO Building Code adopted by Kent
County.
A.
Steps and stairways.
(1)
When risers are closed, all treads may have a uniform
projection not more than 1 1/2 inches.
(2)
The greatest riser height within any flight of stairs
shall not exceed the smallest by more than 3/8 inch. The greatest
tread run within any flight of stairs shall not exceed the smallest
by more than 3/8 inch.
(3)
Stairways shall not be less than three feet in clear
width, with a maximum rise of 8 1/4 inches and a minimum tread
run of nine inches.
B.
Handrails and guardrails.
(1)
Handrails. Handrails having minimum and maximum heights
of 30 inches and 38 inches, respectively, measured vertically from
the nosing of the treads, shall be on at least one side of stairs
of three or more risers. The handgrip portion of the handrails shall
not be more than 2 5/8 inches in cross-sectional dimension, or
the shape shall provide an equivalent gripping surface. The handgrip
portion of the handrails shall have a smooth surface with no sharp
corners. Handrails projecting from a wall shall have not less than
1 1/2 inches between the wall and the handrail.
(2)
Guardrails. Porches or decks located more than 30
inches above the floor or grade below shall have guardrails not less
than 36 inches in height. Open sides of stairways with a total rise
of more than 30 inches above the floor or grade below shall have guardrails
not less than 34 inches in height measured vertically from the nosing
of the treads. Required guardrails on open sides of stairways, raised
floor areas, porches and decks shall have intermediate rails or ornamental
enclosures which will not allow the passage of an object six inches
or more in diameter.
Install expanding rooms in accordance with the
manufacturer's instructions. When the manufacturer's instructions
are not available, perimeter blocking shall be installed in accordance
with Table 4-1; ground anchors shall be installed in accordance with
Figure 5-2.[1]
[1]
Editor's Note: Table 4-1 and Figure 5-2 are
included at the end of this chapter.
