Attic Crawl Space Ventilation

The first paragraph of irc section 408 provides the standard requirement for ventilating crawl spaces.

Attic crawl space ventilation.

The irc prescriptions for venting crawl spaces are contained in section r408 in several paragraphs. Encapsulating a crawl space eliminates these problems by bringing the crawl space into the building envelope and creating a dry healthy space. To convert to square inches multiply by 144. Irc section r408 1 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. Here is an example. Shop 37 roof attic crawl space ventilation at northern tool equipment. Set your store.

Set your store to see local availability add to cart. The dirt ground that makes up the floor of your crawl space is full of moisture. While it may look dry looks are deceiving. The amount of ventilation required is 1 500 150 10 square feet.

The minimum net area of ventilation opening must not be less than 1 square foot for each 150 square feet of under floor space area. Vents in the crawl space allow damp humid air to enter the crawl space where it will damage insulation and lead to mold growth. A house has 1 500 square feet of crawl space area. This moisture will eventually cause issues as well.

Silver galvanized steel crawl space fan vent model v2d 146 32 146 32.