Legal Documents of Halls

Manufactured house foundations and crawl spaces shall conform to the following:

1804.6.2 - Openings

1804.6.2.1 -Ventilation - Crawl spaces under buildings without basements shall be ventilated by approved mechanical means or by openings in foundation walls. Openings shall be arranged to provide cross ventilation and shall be covered with corrosion-resistant wire mesh of not less than ¼ inch (6.4 mm) nor more than ½ inch (12.7 mm) in any dimension. Openings in foundation walls shall not be less than the following:

1. Where wood floor systems are used, such openings shall have a net area of not less than 1 sq. ft. (0.093 m) for each 150 sq. ft. (14 m) of crawl space.

2. Where other than wood floor systems are used, such openings shall be not less than 1 1/1 sq. ft. (0.14 m) of net opening for each 15 linear feet (4572 mm) or major fraction thereof of exterior wall.

3. Where asphalt saturated felt weighing 55 lb (2.7 kg/m) per square, lapped at least 2 inches (51 mm) at joints, or 4 mil (0.0102 mm) polyethylene lapped at least 4 inches (102 mm) at joints, or other approved vapor retarder is installed over the ground surface, the required net area of openings may be reduced to 10% of that required above. There shall be one ventilation opening within 3 ft. (914 mm) of each corner, and these shall be of equal size totaling a minimum of 50% of required openings.

4. An operable vent louver shall be permitted only where an approved vapor barrier is installed over the ground surface.

5. Where combustion equipment is installed within a crawl space, air for combustion shall be provided in accordance with 705.1.1.4, 2810, and Chapter 7 of the Standard Mechanical Code.

1804.6.2 - Access - Usable crawl spaces under buildings without basements shall be provided a minimum of one access opening not less than 18 x 24 inches (457 x 610 mm). Access openings shall be readily accessible and provided with a door or device that may be easily removed or operated. For access to mechanical equipment installed in underfloor areas see Section 304.5 of the Standard Mechanical Code. (as added by Ord. #98-9, Nov. 1998)