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Old 04-15-2004, 01:25 PM   #1
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Replacement Insulation

I am in the middle of replacing all of my Black/Grey tank plumbing under the trailer. Well the fiberglass insulation looks pretty bad and I was thinking how it might be an improvement to replace it with "Spray in Polyurethane Foam".
I was wondering if anyone has any experience with this change. I could get an R value of about 6.7 per inch of foam. This would be loads better than the scanty 2" glass batting. I was also thinking that it would improve the strength of the ABS plumbing, sort of encapsulate it and keep it from rattling on dirt roads.
Thoughts?
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Old 04-15-2004, 01:38 PM   #2
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Gary:

It'd be a booger to tear out should you ever need to access the plumbing lines it (the foam) would surround.
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Old 04-15-2004, 01:45 PM   #3
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Quote:
Originally Posted by 87MH
It'd be a booger to tear out should you ever need to access the plumbing lines it (the foam) would surround.
I hadn't thought of that, maybe spray it just as thick as 1/4 to 1/2 of the pipe in thickness. That would give me about 2" to 3" or about R-13 to 18.
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Old 04-15-2004, 01:50 PM   #4
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Dennis

I agree with a lot of what you say but disagree this time. I inuslated all my walls with spray foam. All the small openings were covered with masking tape, the wiring and vents were plumbing vents were sprayed. Removal is as simple as cutting with a sharp serrated knife, the insulation sticks to the aluminum but peels off as a plug. I would do it again.

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Old 04-15-2004, 01:50 PM   #5
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I'm wondering how the original batts were held in place?? or were they at all?
also wondering if its worth the effort for a "fair-weather" camper. how about those hermetically sealed fiberglass batts? so you don't git all itchy, and stuff? don't know what the r-value is, though...I seem to remember "R-11" being printed on the side of some 2" rigid foam boards that I have in my basement (different project ).

might be doing similar work this season. take pictures!!
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Old 04-15-2004, 02:51 PM   #6
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Quote:
Originally Posted by chuck
I'm wondering how the original batts were held in place?? or were they at all?
also wondering if its worth the effort for a "fair-weather" camper. how about those hermetically sealed fiberglass batts? so you don't git all itchy, and stuff? don't know what the r-value is, though...I seem to remember "R-11" being printed on the side of some 2" rigid foam boards that I have in my basement (different project ).

might be doing similar work this season. take pictures!!
Chuck

The fiberglass was a bare batt. It was one piece being held in place by just the pipes. No stick em or tape, no nothing. I thought it was a pretty cheesy way of doing it, it crushed the batt to less than 1/2" thick under the pipes.
I looked at the web site for the spray foam and they listed R 6.7 per inch thickness.
Good ideaon the pics, I'll take some pictures before I seal it back up.
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Old 04-15-2004, 03:18 PM   #7
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so when you drop the belly pan, be prepared for this stuff to drop right out in your face with it, eh?

does sound "cheesy". and the R-value only holds true if the stuff is allowed to fluff to its intended thickness. doesn't apply if you squish it up. so perhaps I have an indirect answer to my question: it ain't doing anything, except perhaps providing the mice w/ cozy accomidations.

I guess there's not really much place for it to go, though...only needs to stay in place long enough for them to re-attach the belly pan.
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Old 04-15-2004, 04:30 PM   #8
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I just dropped the belly pan in my 72' and the insulation was fairly thin (about 3"), in very good shape, and sandwiched between the beams and the plywood which is what was holding it in. Surprisingly enough, no signs of rodents, a spider or two, and no snake skins.
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Old 04-15-2004, 06:20 PM   #9
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"Stealth Post"This is really Gary. I found 4 Wasp nests and a lot of Black Widow egg sacs. All clean now. Ya, the insulation they used is for the birds or Wasps or what ever. I'm going to use the spray foam to do away with all that.
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Old 04-15-2004, 07:15 PM   #10
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How well does foam hold/attract moisture? The bottom area of the trailer must "breathe" otherwise rot sets in the floor. It is for that reason I just take the insulation out and leave it out. To me its just a big sponge - I've also been told you don't want to tight seal the belly - it must breathe.

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Old 04-15-2004, 09:10 PM   #11
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Thinking out loud,
Wouldn't the vibration from towing the trailer just rattle the spray foam to dust?? Over time that is...... like a few years/ thousnad or more miles of towing
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Old 04-15-2004, 09:29 PM   #12
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Originally Posted by till
Thinking out loud,
Wouldn't the vibration from towing the trailer just rattle the spray foam to dust??
Several people on these forums have mentioned replacing the insulation in the walls with foam, and I had always feared the same problem. However, I recently saw an Avion in a salvage yard that had foam insulation in the walls. I was impressed by two things: 1) How well the foam had remained intact; and 2) How many voids it had in it.

There may be more movement underneath, however. Airstream frames are rather "springy".

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Old 04-15-2004, 09:32 PM   #13
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I think Andy from Inland RV said that Airstream tried the Foam insulation but had trouble with it. I know that the GMC Motorhomes used it without much trouble, and now with this Avion info. I wonder what was the main issue? John, I know you used it. it will be interesting to see how it holds up over time.

Who knows, maybe they tried an early version of it?
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Old 04-15-2004, 11:11 PM   #14
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Whats the name of the spray in foam stuff? had not thought of that but sounds like a great idea......
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