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View Poll Results: Best Insulation for Walls/Ceiling
Polyiso, PIR, ISO 14 9.40%
XPS (Blue/pink 'Styrofoam') 8 5.37%
EPS (White 'Styrofoam') 0 0%
3M Thinsulate SM600L (synthetic fiber) 88 59.06%
Fiberglass rolls or batts 0 0%
Polyurethane foam (white/yellow spray) 10 6.71%
Icynene foam (eco-friendly spray, closed cell) 3 2.01%
Sheep's wool 26 17.45%
Voters: 149. You may not vote on this poll | Withdraw Vote

 
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Old 03-16-2019, 06:25 PM   #21
gltrimble
 
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Default Best Insulation for Walls/Ceiling

Quote:
Originally Posted by Robert-NE View Post
So, is the potential safety factor of spray foam the ONLY downside?

I do not view the “safety factor” of foam as an issue. The biggest issues to me are:

1) Possibly oil canning the sides of your van as many have managed to do.

2) A bigger issue is electrical and plumbing. Installed prior to spraying foam and it is inaccessible. Install after spraying and it is a lot of work and a mess.

If cost is the same I see no reason not to go with Thinsulate as your primary insulation. Done right your van will be comfortable in a wide range of temperatures. Installing Thinsulate as you build out your van also gives you the flexibility to make changes and mods without having to remove foam.




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Last edited by gltrimble; 03-16-2019 at 06:28 PM.
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Old 03-16-2019, 07:07 PM   #22
GSWatson
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Default Re: Best Insulation for Walls/Ceiling

I was just about to say the same thing...

And I don’t think that foam is any quicker, when you count all the time of having to prep the vehicle for phone, and clean up afterwards.


Greg
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Old 03-16-2019, 07:46 PM   #23
hein
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Default Re: Best Insulation for Walls/Ceiling

Some folks don't want to use even 3M low VOC spray adhesive to install Thinsulate(TM) in the ceiling and we understand that. I recently came across a method using string or light rope. Amazing what our customers can come up with.



We now stock Worx power shears to make cutting Thinsulate(TM) SM600L easier for those folks with weak hands or get tired using the the shears we recommend. We modify them to more easily cut thicker materials.




The shoe is cut out of aluminum flashing and attached with superglue. We haven't had a chance to list the shears so please contact Kim so she can add those to your order. Don't let your kids use these.

All the best,
Hein
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Old 03-17-2019, 05:49 AM   #24
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Default Re: Best Insulation for Walls/Ceiling

One thing I've enjoyed about the 1.5 inch batts of Havelock sheep's wool is you can peel off layers. So, if you have a little extra space.... Add a partial layer.

Downside....there are some places I want to add it in the cab but it does leave behind a mess. I'm guessing thinsulate is much better here.

I've also found that Super 77 works much better than Super 90 when installing the wool. Long term... I will let you know.

I wasn't happy using spray adhesive but the stink dissipates very fast with no lingering odors and it makes it sooooo easy.
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Old 03-18-2019, 04:43 AM   #25
hein
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Default Re: Best Insulation for Walls/Ceiling

Quick correction to my last post. It is not string/rope holding the Thinsulate(TM) SM600L against the roof. They are hardwood dowels. This is in a Transit so existing holes were used. But some thin strips attached to the bottom of the roof beams would also work. Below are some better photos. This customer does not have a headliner so the scrim is the finish layer. Not a bad look, actually.





All the best,
Hein

P.S. 3M 77 spray is not temperature resistant enough for use in vehicles. It also creates a lot of over spray and mist so were a mask if using it anyway.
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Old 03-18-2019, 04:58 PM   #26
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Default Re: Best Insulation for Walls/Ceiling

Quote:
Originally Posted by Robert-NE View Post
NNGVan, how did you come up with a system R value of 9+?
Polyiso/foam is 6 in” the air gap foil provides 3-9 but there is arguments around the effectiveness.

Here’s my thought about sun. It traveled 92 million miles to heat up your van no 1” anything is going to stop it. But you can keep 90% of it from even reaching you by redirecting it back out with foil.

On your windows it’s a no brained use foil.

If I had to do it over? I’d put up foil on all the ribs first lose an inch and poly foam then cover it again with foil. Skin air foil foam foil interior. This would have been so much easier. And around $150 I’d challenge anyone to show me a better $/R value system.

But maybe you have $1000 to spend on your walls to each their own.

I also got my van for $5000 and put $3000 in repairs and tires but total build limit was 15k
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Last edited by NNGVan; 03-18-2019 at 05:06 PM.
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Old 03-19-2019, 01:05 PM   #27
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Default Re: Best Insulation for Walls/Ceiling

HI Guys,
Here is what I did with the insulation.
www.campervanconversionbuild.com/insulation
hope this helps
john

Last edited by fisjon; 03-19-2019 at 01:08 PM.
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Old 03-19-2019, 02:14 PM   #28
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Default Re: Best Insulation for Walls/Ceiling

Quote:
Originally Posted by NNGVan View Post
Polyiso/foam is 6 in” the air gap foil provides 3-9 but there is arguments around the effectiveness.

Here’s my thought about sun. It traveled 92 million miles to heat up your van no 1” anything is going to stop it. But you can keep 90% of it from even reaching you by redirecting it back out with foil.

On your windows it’s a no brained use foil.

If I had to do it over? I’d put up foil on all the ribs first lose an inch and poly foam then cover it again with foil. Skin air foil foam foil interior. This would have been so much easier. And around $150 I’d challenge anyone to show me a better $/R value system.

But maybe you have $1000 to spend on your walls to each their own.

I also got my van for $5000 and put $3000 in repairs and tires but total build limit was 15k
What color is your van?
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Old 03-19-2019, 06:03 PM   #29
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Default Re: Best Insulation for Walls/Ceiling

Personally I like the closed cell foam mat. I've used this stuff in 3 different builds, including the 2018 4x4 we are building now. I settled on using 3/4" and buying the rolls from Super Soundproofing in CA. I'm doing the floor, wall, and ceiling with a single layer and the results are amazing both in terms of thermal and acoustical. I use spray glue to attach the foam but they offer the foam with a pressure sensitive adhesive backing (peel and stick). FWIW, we had a morning 2 weeks ago where the overnight temps dropped into the single digit range, our little D2 managed to keep the inside temp @ 65 degrees F. This is a 170 window van and there is zero insulation in the pillars or the ribs running across the top. Windows were not covered at all!
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Old 03-22-2019, 07:55 PM   #30
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Default Re: Best Insulation for Walls/Ceiling

I wonder what insulation will release accumulated heat the fastest?

The ones with the lowest r value?
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