Crawl Space Ventilation - General Discussion - Contractor Talk

Crawl Space Ventilation

 
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Old 01-25-2019, 10:22 PM   #1
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Crawl Space Ventilation


I have a client who has had her house raised due to flooding issues. The contractor filled in around the slab to prevent water and vermin from gaining access. Now we have moisture vapor coming up into the house. What does the building code say about ventilating crawl spaces.
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Old 01-25-2019, 11:35 PM   #2
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Re: Crawl Space Ventilation


Kind of an either/or.

Either ventilated with a vent for every 150 sq ft. or totally encapsulated from the soil with a heavy poly barrier with sealed seams.


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Old 01-25-2019, 11:36 PM   #3
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Re: Crawl Space Ventilation


Of course this varies somewhat with region.


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Old 01-25-2019, 11:56 PM   #4
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Re: Crawl Space Ventilation


I'm confused. Your trade is "concrete"? Does that mean you're the contractor who filled in around the slab? How else would the client be your client?

As a contractor, particularly in concrete, shouldn't you already be somewhat familiar with the relevant codes?
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Old 01-26-2019, 01:27 AM   #5
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Re: Crawl Space Ventilation


Mechanical ventilation, while not optimal, is permissible also, at least out here, need to follow the code.
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Old 01-26-2019, 07:32 AM   #6
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Re: Crawl Space Ventilation


My question is "what are the code requirements for ventilation under house in a situation like this". The 150 sq.-ft. advice is on track. This is not a structural issue. Raising houses is a little out of the ordinary but I think this would be common in a pier and beam or house set on blocks, both of which are older methods in my area. I am trying to help a widowed friend solve some of her problems and am a little out of my purview. I hope to be able to have the city force the foundation contractor to provide the ventilation, as he should have done in the beginning, or barring that, I am open to suggestions on how to accomplish this myself.
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Old 01-26-2019, 09:06 AM   #7
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Re: Crawl Space Ventilation


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