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Old 02-27-2010, 10:43 PM   #15
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I'm going with 2" rigid foam spaced from the floor bottom with 1" rigid foam.
Please explain
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Old 02-28-2010, 06:27 AM   #16
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None, insulation is nothing but a magnet for water contributing to floor rotting. Will be adding stainless steel air vent's to belly pan for proper air ventilation.

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Old 02-28-2010, 07:39 AM   #17
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Please explain
1 " foam spacers similar to what Becky did in post #8, except I will be glueing 2" foam to the spacer instead of Prodex.
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Old 03-03-2010, 10:48 AM   #18
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I didn`t use any insulation under the floor,i had so many mouse runs through the floor and walls,i figured i wasn`t going to give them a second chance,,,i ran the belly pans on my 65 caravel to the two main frames and left the center section open...i used 5/8 t&g fir and sealed the whole underside,,,i want to use cork flooring to finnish off the interior of the floor..does any body know if i should seal the top of the floor before i install the cork,,and what should i seal it with? I used a oil based paint for the bottom,,i`m also going to spray shutz the wheel wells and any where else the water might come in
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Old 03-03-2010, 11:56 AM   #19
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What is the purpose of spacing the foam away from the floor?
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Old 03-03-2010, 12:04 PM   #20
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The foam spacers serve two purposes. Create an air space which improves insulation and also allows for ability of any moisture that might get in, to get out.
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Old 03-03-2010, 12:04 PM   #21
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A sealed air gap is a very good insulation and Free. The secret is the space has to be SEALED. Just think back to the wooden old windows in your home if you are over 50. They leaked like a sieve around the edges and offered very little insulation.
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Old 03-03-2010, 12:14 PM   #22
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If moisture can get in or out it is not insulating.

Here is the comparison of foam insulation to most other types commonly used.
Foam insulation typically is more expensive than fiber insulation. But it's very effective in buildings with space limitations and where higher R-values are needed. Foam insulation R-values range from R-4 to R-6.5 per inch of thickness, which is up to 2 times greater than most other insulating materials of the same thickness.
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Old 03-03-2010, 12:29 PM   #23
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If moisture can get in or out it is not insulating.

Here is the comparison of foam insulation to most other types commonly used.
Foam insulation typically is more expensive than fiber insulation. But it's very effective in buildings with space limitations and where higher R-values are needed. Foam insulation R-values range from R-4 to R-6.5 per inch of thickness, which is up to 2 times greater than most other insulating materials of the same thickness.
Well then one reason.
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Old 03-03-2010, 01:30 PM   #24
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Well then one reason.
Actually I was stating 2 reasons.

The first speaks to the fact that air can not be allowed to move through an insulated area.

The second speaks to the effectiveness of foam insulation when evaluated under controlled conditions.

Both question had been noted above and they will not give you adequate instructions to achieve results at the Big Box Store
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Old 03-03-2010, 08:06 PM   #25
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A sealed air gap is a very good insulation and Free. The secret is the space has to be SEALED. Just think back to the wooden old windows in your home if you are over 50. They leaked like a sieve around the edges and offered very little insulation.
So, are you saying that the insulating job that Airstream did on all of our trailers was in vain? The belly pans all have holes in them. Should they be completely sealed? What have you done with your trailer? What do you suggest for those of us who use our trailers in cold weather? Just curious, not being a smart***.
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Old 03-03-2010, 08:33 PM   #26
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I have done nothing.

The insulation installed at the factory is within accepted standards. It is laid over the frame and the floor dropped down on it. This produces an uninterrupted, Sealed Area. The best that manufacturing cost considerations will allow. Not the best science would suggest.

My comments about sealed air pockets and sealing the perimeter of any solid insulation were just to inform anyone considering that type of insulation that there were installation considerations that would normally not be adhered to and thus discount the complete installation. Solid types of insulation are generally 2 to 4 times better than the pink stuff but those results are obtained under controlled installations that insure an effect installation.

If you want to do the best job you would use cork. Cork has the higher rating than Styrofoam but it stinks for a year or 2 after installation.
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Old 03-03-2010, 09:18 PM   #27
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Best to do nothing or have rigid board with a air gaps or what? SO, not sure what to do.
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Old 03-03-2010, 09:22 PM   #28
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I'm confused too. There must be at least 20 different opinions on how to do the insulation under the floor. I'm in the middle of doing mine (after reading all of the opinions) and am now hoping I've chosen the right one!
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