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Old 08-17-2010, 08:19 AM   #15
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Prodex - fit spacers, cut, tape into place.
fiberglass - dress well, cut, fit into place, shower, itch for a week anyway.
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Old 08-20-2010, 07:13 PM   #16
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the insulation debate and spray foam....

I'm in the process of insulating the floor of my 1979 Argosy right now. I dropped the bannana wraps and belly pan. I'm not sorry that I did. The insulation was in such bad shape due to water intrusion it was essentially not there.

I decided to insulate with a rigid commercial grade polyisocyanurate insulation underneath the flat areas of the floor (R-18) and with a high density (R-15) fibergalss insulation in the bannana wraps. The poly iso was done in two layers layed in opposing directions and was tightly fit between the frame members and then run the opposite direction. The fiberglass was cut to fit and then slipped into the cavity between the sheetmetal and the bottom of the floor.

I applied a rubberized undercoating to the entire underside of the floor. I closed off the penetrations that were open with expansive foam, and I caulked all of the connections between the frame and the subfloor to control the movement of air from one area to another and to keep out bugs etc...

I also worked extensively to keep the water and out of the subfloor in the future. As a builder it makes absolutely no sense to talk about insulating a climate controlled space with the supporting floor full of moisture, the insulation full of water, and openings that permit the out door air into the area beneath the floor.

Hope this helps the debate. Please don't bomb me with info regarding combustability of poly iso. If you can fit into the belly pan to have a smoke, it's probably time to quit anyway!
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Old 03-31-2011, 11:45 AM   #17
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I had a quick question that I figured I would tack on here. I've read from numerous sources that it's a good idea to put foam/felt/something insulating strip between the ribs and the interior walls.

I'm working on a '48 Boles Aero and will have wood interior panels. Is that necessary in this application? Thanks.
-Blake
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Old 03-31-2011, 06:22 PM   #18
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Could you be talking about a vapor barrier by chance?
That is exactly a good place to put a vapor barrier I gather
Vapor Barrier What Is It and How It Works | Home Insulation | Home Insulation Info
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Old 03-31-2011, 06:46 PM   #19
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Nawsir, he's talking about hearing people wanting a thermal break to keep the aluminum interior panels-to-ribs from conducting heat madly as they do.

If I were attaching wood to the ribs I think I'd be exploring a tough painted coating over the rib contact area to keep the heat cycle heave & shrink and vibration from producing black aluminum oxide dust - one, its unsightly if it infiltrates the interior and two, it would be a squeak maker deluxe if there is any relative movement between the surfaces. Think Duck hunting call.
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Old 03-31-2011, 07:31 PM   #20
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Ceramic thermal coatings. A spin off from NASA.
All About Ceramic Insulation
Powder of ceramic air balls that you mix with paint.
Awesome.
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Old 03-31-2011, 07:39 PM   #21
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ThermaBlok, another interesting NASA insulation spinoff. Aerogel.
Residential Construction
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