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.
This moisture will eventually cause issues as well.
Irc section r408 1 ventilation.
A house has 1 500 square feet of crawl space area.
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While it may look dry looks are deceiving.
Of course sealing your crawl space vents isn t going to solve all your issues.
The amount of ventilation required is 1 500 150 10 square feet.
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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.
Here is an example.
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.
Vents in the crawl space allow damp humid air to enter the crawl space where it will damage insulation and lead to mold growth.