N.H. Admin. Code § Inst 603.02 - Site Preparation Systems
(a) This section
prescribes standards for siting, design and installation of manufactured house
support systems. It shall be applicable to all new and relocated manufactured
houses when and wherever newly installed at a house site.
(b) The house shall be designed to meet the
New Hampshire wind, snow roof loads, and climatic conditions as described on
the manufactured house data plate. Houses that are designated on the
manufacturer's data plate in a low pounds per square foot (PSF) snow zone,
which includes 30 PSF shall not be installed in a higher roof load
zone.
(c) The house shall be able
to be safely moved to the site, which should be free of branches, holes in the
ground and hanging wires to prevent any preliminary damage to the
house.
(d) A manufactured house
support system shall be constructed in accordance with one of the following:
(1) Manufacturer's installation manual
instructions;
(2) Foundation design
by a New Hampshire licensed professional engineer or architect; or
(3) This chapter.
(e) Site preparation shall be in accordance
with general residential construction practices.
(f) Houses shall not be constructed in any
naturally occurring seasonal drainage swale. In order to prevent moisture under
the house, which can cause settling of the support system and deterioration to
the house, water shall not be able to accumulate or stand under the
house.
(g) Gravel or concrete slab
under the house shall be crowned 1 to 2 % along the longitudinal center line of
the house.
(h) All drainage shall
be diverted away from the home and must slope a minimum of one-half inch per
foot away from the foundation for the first 10 feet. Where property lines,
walls, slopes, or other physical conditions prohibit the slope, the site shall
be provided with drains or swales or otherwise graded to drain water away from
the perimeter of the house.
(i) A
vapor retarder shall be used above the gravel or below the concreteif the house
is enclosed by skirting to keep ground moisture out. If overlap of the
polyethylene is required, it shall be at least 12 inches at all
joints.
(j) The fire separation
distance shall be provided, as the state and local authority
requires.
Notes
#8494, eff 12-24-05; ss by #10155, eff 4-14-12
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