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Old 05-28-2014, 07:07 PM   #1
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Spray foam insulation

My Damon Intruder has standard fiberglass batts in the overhead area of the front cap. I feel some dampness between the insulation and the fiberglass cap material. I don't believe it's a leak but rather condensation due to cool air inside coming against the hit cap material. I should mention the fiberglass insulation isn't attached but simply shoved into the area behind the overhead cabinets above the windshield. Now, this area gets pretty darn hit due both the sun and the electrical equipment I mounted in the old tv cabinet.

My question is. ... Can one use spray foam insulation directly on the underside of front cap? I'd like to remove all the fiberglass batt insulation and spray a couple of inches of the foam stuff. Plus I will install some low voltage super silent fans to move the air in the compartment.

Any thoughts?
Thanks!
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Old 05-28-2014, 07:13 PM   #2
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That stuff is hard to control, and it takes much experience to learn how much expansion you are going to get. Also I'm not sure if that would solve your moisture problem. Do you have a moisture barrier over your fiberglass insulation? And maybe you just have too much moisture inside your RV?
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Old 05-28-2014, 07:31 PM   #3
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Spray foam can be a bear to remove at some later time, and it's hard to spray in sheet form, it's more for filling voids. Why not use spray adhesive and glue the fiberglas bats to the inside of the cap?
Also, unless air is circulating up there moisture shouldn't condense in that area. Check your clearance lights, antenna, and any other thing coming through the roof in that area.
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Old 05-29-2014, 10:24 AM   #4
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Judy. .. there is no moisture barrier. The batts aren't even paper backed.
BFlinn. .. air is circulating now since I removed the crt tv and installed other electronics in the cavity. Plus I removed blank panels at either end of the overhead to facilitate wire runs. Considering when I was in the southwest the problem didn't exist and now I'm in an area with dew points hovering around 70 I'm pretty sure it's simple condensation.
I may need to try the spray adhesive.
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Old 05-29-2014, 07:57 PM   #5
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While spray foam insulates very well, it makes water leaks next to impossible to locate.
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