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My house (about 10 years old) was built with very few vents for the under-floor area. I would like to add some, and have plenty of space between the floor and the top of the foundation wall. The question is: How do I cut these into the stucco wall, and once that is
done, how do I ensure no moisture gets in through the vent opening and into the plywood wall that backs up the stucco?
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Why do you feel like you need more vents? Is there a specific reason or are you just speculating that what you have is not enough?
There is a lot of controversy over attic ventilation/nonventilation, but non vented crawl spaces are becoming widely accepted. A crawl space is little more than a short basement. Presuming you don't have a radon problem, you could block you existing vents insulate the walls and cover the floor with poly.
If you insist on venting, first consider making a louvered access door.
You can saw cut holes in the stucco with a masonry or diamond blade and put in screened vents. Careful caulking should take care of any potential leakage problem.
*> Why do you feel like you need more vents? Is there a specific reason or are you just speculating that what you have is not enough? The ground under the house remains damp even at the end of summer--I'm concerned that this will attract termites, cause mildew, etc.