Camp crawl spaces- question on sealing? - The Outdoor Community
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post #1 of 4 (permalink) Old 03-08-2015, 06:23 PM Thread Starter
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Camp crawl spaces- question on sealing?

I've been doing a lot of researching on buildings with crawl spaces. I see that a lot of homes with crawl spaces are closing off traditional block wall vents, adding vapor barriers to the walls, over the dirt floors, even insulating between the floor joists at the sill plate. Any thoughts on this as it relates to camps, that are only seasonally heated and used?

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post #2 of 4 (permalink) Old 03-08-2015, 08:36 PM
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Re: Camp crawl spaces- question on sealing?

We put plastic on the ground topped with gravel then insulated the floor joists and covered that with osb. Was a pain but helps keep the floor from feeling like a popsicle.

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post #3 of 4 (permalink) Old 03-08-2015, 09:01 PM
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Re: Camp crawl spaces- question on sealing?

6 mil vapor barrier for floor covered with limestone, insulate joist space with unfaced R-30 to R-38 fiberglass batt insulation and cover all of that with fsk vapor barrier. Keep vents in wall sufficient in size to meet code and install in one or two of them a muffin fan to turn the air in the crawlspace over quickly.
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post #4 of 4 (permalink) Old 03-09-2015, 09:05 PM
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Re: Camp crawl spaces- question on sealing?

First of all, I hate crawl spaces. I do a lot of insurance investigations of rotted framing over insufficiently vented crawl spaces. The code requires one square foot of net free venting area (NFVA) for every 150 square foot of crawl space. Vents should be located to provide cross flow and one vent within 3 feet of each corner. A typical 8 x 16 louvered block vent provides about 64 square inches of NFVA each. The venting requirement can be reduced to 1 square foot for every 1500 square foot of crawl space if you use a vapor retarder with sealed seams and sealing of the barrier to the stem walls. You also need a drainage system to prevent the accumulation of water. I also recommend insulation around the perimeter to prevent warmer air from condensing on the cold exterior walls. As mentioned above, mechanical venting is an option, but if used, should run continuously. Did I already mention that I hate crawl spaces?
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