Code of Maine Rules › 02 - DEPARTMENT OF PROFESSIONAL AND FINANCIAL REGULATION › 385 - MANUFACTURED HOUSING BOARD › Chapter 900 - USED MANUFACTURED HOME INSTALLATION STANDARD › Appendix 385-900-D - Ground Level Installation of Used Manufactured Homes (Floor at Grade)

Current through 2024-29, July 17, 2024
I. Site Preparation Detail I
A. This detail may be used on any foundation site
				  that:
1. Does not contain any mud, organic silt or uncontrolled
				  fill; and
2. The highest ground water table is more than 24" below the
				  finish grade.
B. Refer to Appendix A(III) Installation Zones to determine
				  the required compacted fill depth under the footings or slab.
C. Construction may be placed on naturally occurring soils
				  after all organic material has been removed from the construction site.
D. Compacted fill may be placed below the original site grade
				  only if a drainage system is installed in the fill to prevent the accumulation
				  of water within 24" of the bottom of the footing.
E. Finish grade shall be loamed and seeded with grass or
				  otherwise finished to prevent erosion of compacted fill.
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II. Site Preparation Detail II
A. This detail may be used on any foundation site
				  that:
1. Does not contain any mud, organic silt or uncontrolled
				  fill; and
2. The highest ground water table is within 24" of the finish
				  grade
B. If a concrete slab is to be constructed on this site,
				  crushed rock must be installed under the entire concrete slab.
C. A drainage swale at least 6" deep and within 10' of the
				  sidewalls of the home must be constructed around the home.The swale shall have
				  an unobstructed discharge allowing water to flow away continuously from the
				  perimeter of the home.
D. The 4" drainage system shall provide for free flow of
				  water from the rock pads and shall prevent the accumulation of any
				  water.
E. Finish grade shall be loamed and seeded with grass or
				  otherwise finished to prevent erosion of compacted fill.
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III. Footing Detail I
A. Concrete shall have a minimum compressive strength of 3000
				  psi at 28 days
B. Concrete shall be protected from freezing for the first 7
				  days after it has been cast.
C. Footing pads may be cast on site or precast and delivered
				  to the site for placing.
D. Footing pads which are precast for later placement shall
				  be cured at least 7 days prior to handling.
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IV Footing Detail II
A. This detail is of a wood isolated footing to be placed on
				  a prepared site.This detail may be used when pier height does not exceed
				  30".
B. Wood used in this detail must be southern yellow pine, #2,
				  pressuretreated with water-borne preservatives in accordance with AWPA Standard
				  U1 to the requirements of UC4, ground contact applications.
C. Pier concrete blocks shall be centered on the wood footing
				  with the 16" dimension parallel to the (3) 2" x 8" pressure-treated
				  boards.
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V. Pier Detail
A. This detail applies to piers which are a maximum of 24"
				  high from the top of the footing.
B. Masonry units in this detail shall comply with ASTM
				  C90.
C. Wood block shall be of a structurally graded lumber with
				  the 12" dimension centered under the main frame.No more than 2 wood blocks may
				  be stacked.
D. Shims shall provide contact between the main frame and the
				  2" x 10" for at least 6".
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VI. Concrete Slab Detail
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VII. Support Location Detail I
A. This detail may be used for home support locations
				  when:
1. The manufacturer's installation instructions are not
				  available; and
2. The home's floor frame is constructed with 2" x 8" or
				  wider floor joists; or
3. The home's floor frame is 12' or less wide
B. Support locations are required within 2' of the end of
				  the main frame and at no more than 8' o.c. under the main frame.
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VIII. Support Location Detail II
A. This detail may be used for home support locations
				  when:
1. The manufacturer's installation instructions are not
				  available; and
2. The home's floor frame is constructed with 2" x 4" or 2"
				  x 6" floor joists; or
3. The home's floor frame is more than 12' wide
B. Support locations are required within 2' of the end of
				  the main frame and at no more than 8' o.c. under the main frame.Continuous
				  perimeter support is required under side walls of the unit.See Exception
				  below.
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IX. Continuous Perimeter Blocking Detail
A. This detail applies where continuous perimeter blocking or
				  support is required.
B. Ventilation openings shall be provided through sheathing
				  as required by Subchapter B(VII) to this Chapter.
C. Accessopenings shall be provided to the underside of the
				  home as required by Subchapter B(VII)(E) to this Chapter.
D. Pressure-treated lumber shall be treated in accordance
				  with AWPA Standard U1 to the requirements of UC3, above ground
				  applications.
E. Sheathing shall be provided with protection against
				  weather deterioration.
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