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Old 06-10-2016, 03:57 PM   #1
Jmolan
 
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Default Spray in foam now warp drive

I need to do a follow up on our insulation. Last Dec. we had spray in done by experienced contractors. They used two kinds of foam as they explained the slower expansion in the tight spots could prevent sheet metal oil canning.
The first few months I was very happy with it, no warpage, no problems. Quiet warm in the winter/cool in the heat etc.
We went to Mexico in March/April and the van skin slowly warped in a number of places. From the heat? It is actually a difficult thing to photograph as the reflection and lighting have to be just so.
It is most notable on the top panel full length, the lower back doors, and some on the lower panel.
I had previously posted how happy I was with great insulation/sound and no warpage. I need to retract that and apologize if anyone has had similar results from my posting. I still really like the insulation, and most times I do not see the oil canning, but it is there, and I will live with it.
IMG_3220.jpg

IMG_2731.jpg

IMG_2729.jpg

IMG_2723.jpg
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Old 06-10-2016, 04:19 PM   #2
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Default Re: Spray in foam now warp drive

I wonder if its from the thermal expansion coefficient of the foam? I suspect the steel is much lower coefficient, so when the foam expands the metal warps inward, and when it contracts the metal warps outward.

I have 1-1.5" of tigerfoam on my T1N, and no warping even in the summer sun.

Can you share the brand/type and thickness of your foam? Is it 100% coverage? did you have them fill the voids in the pillars and structure tubes?
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Last edited by Midwestdrifter; 06-10-2016 at 05:16 PM.
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Old 06-10-2016, 04:27 PM   #3
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Default Re: Spray in foam now warp drive

It may ~revert~ return to its previous state.

Thanks for the pictures
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Old 06-10-2016, 04:34 PM   #4
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Default Re: Spray in foam now warp drive

This is what came out of the roof fan section. I could find out what kind of foam, I know it is two different kinds.

I have had it between 90 degree and under freezing now, and it looks to be set and not changing.

IMG_2080.jpg

IMG_2084.jpg
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Old 06-10-2016, 04:36 PM   #5
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Default Re: Spray in foam now warp drive

Quote:
Originally Posted by Midwestdrifter View Post
I wonder if it from the thermal expansion coefficient of the foam? I suspect the steel is much lower coefficient, so when the foam expands the metal warps inward, and when it contracts the metal warps outward.

I have 1-1.5" of tigerfoam on my T1N, and no warping even in the summer sun.

Can you share the brand/type and thickness of your foam? Is it 100% coverage? did you have them fill the voids in the pillars and structure tubes?
Yes it bumps out at the frames it looks like, and oil cans in between
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Old 06-10-2016, 04:39 PM   #6
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Default Re: Spray in foam now warp drive

Here is a somewhat off the wall idea. Taking a knife and cutting the foam at 2-3 inch intervals in a grid pattern may allow it to flex. This might relieve the stress and prevent the warping? Just a thought. It wouldn't impact insulation value much either way.
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Old 06-10-2016, 04:46 PM   #7
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Default Re: Spray in foam now warp drive

That is weird. It looks like it's bowed inwards between the frames. I'd have thought it would bow outwards with the expansion due to heat or the foam curing.

Thanks for the update.
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Old 06-10-2016, 05:08 PM   #8
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Default Re: Spray in foam now warp drive

Sorry to see this occur. Thank you for sharing with all of us.
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Old 06-10-2016, 06:06 PM   #9
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Default Re: Spray in foam now warp drive

Sorry about your problem. Did they use 2 types of foams on your van or they had 2 options? If they used 2 types in layers each one could have a different coefficients of expansion causing “bimetal” spring effect, bowing inwards. Midwestdrifter idea is a good one or if still possible just replace it with a painless Thinsulate, Hein is in Hood River a few hours drive from Bend.

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Old 06-10-2016, 08:16 PM   #10
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Default Re: Spray in foam now warp drive

Make sure the two foams are compatable. Some foams will break down others. A lot of contractors just go off of the wholesale brochures of foams untested together.
When our fire engine was done at factory they had it recalled as the foam was reactive to oil and gas we stored in compartment. The foam also offgassed in compartment with circ saw blades which is a no no for some saw blades/diamond mix blades-
Anyway, I remember them saying at factory we toured that the MSDS and other info on foam do not give full picture as some foams are patented/copyrighted and do not disclose ingredients. We were told they would never mix different foams.
Something to look into as if nothing else, get your $ back from contractor-
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