Did you know the 2015 International Residential Code (IRC) has certain requirements for crawl space, under-floor, ventilation? This information is covered in IRC, section R408.1, titled Ventilation.
"The under-floor space between the bottom of the floor joists and the earth under any building (except space occupied by a basement) shall have ventilation openings through foundation walls or exterior walls. The minimum net area of ventilation openings shall be not less than 1 square foot for each 150 square feet of under-floor space area., unless the ground surface is covered by Class 1 vapor retarder material. Where a Class 1 vapor retarder material is used, the minimum net area of ventilation openings shall be not less than 1 square foot for each 1,500 square feet of under-floor space area. One such ventilating opening shall be within 3 feet of each corner of the building."
Crawl Space Door System, Inc. specializes in crawl space preservation. We design products such as, crawl space doors, air vents, fans and vent covers. Please contact us if you have any questions about crawl space preservation or crawl space code requirements. Our phone number is 757-363-0005 and our email is firstname.lastname@example.org.
Written by William G. Sykes