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Attic crawl space ventilation.
The first paragraph of irc section 408 provides the standard requirement for ventilating crawl spaces.
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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.
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.
The dirt ground that makes up the floor of your crawl space is full of moisture.
To convert to square inches multiply by 144.
The irc prescriptions for venting crawl spaces are contained in section r408 in several paragraphs.
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.
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While it may look dry looks are deceiving.
This moisture will eventually cause issues as well.
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Irc section r408 1 ventilation.