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View Poll Results: Best Insulation for Walls/Ceiling
Polyiso, PIR, ISO 10 8.06%
XPS (Blue/pink 'Styrofoam') 6 4.84%
EPS (White 'Styrofoam') 0 0%
3M Thinsulate SM600L (synthetic fiber) 77 62.10%
Fiberglass rolls or batts 0 0%
Polyurethane foam (white/yellow spray) 9 7.26%
Icynene foam (eco-friendly spray, closed cell) 2 1.61%
Sheep's wool 20 16.13%
Voters: 124. You may not vote on this poll | Withdraw Vote

 
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Old 03-31-2019, 07:42 PM   #61
Shawn182
 
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Default Re: Best Insulation for Walls/Ceiling

OK, have another twist of a question. I am doing Thinsulate throughout...but as I install there are tons of nooks, crannies, and holes that I am trying to figure out what is best to shove in there. Strips of thinsulate don't seem all that practical or effective bunched up...so what is the best option to pack those ribs and such?...break up some wool?...shred off scrap thinsulate of the scrim?...Denim?

One of the objective is to keep heat OUT in hot climates so wanna pack something in there while walls are open.
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Old 03-31-2019, 07:51 PM   #62
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Default Re: Best Insulation for Walls/Ceiling

Cut thin strips of thinsulate and pull them thru the roof beam channels (suck a string thru with a vacum cleaner), I used a hydrophobic loose polyester fill (for quilts & stuffed animals) and stuffed it into hard to get to hollow spaces.....
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Old 03-31-2019, 07:57 PM   #63
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Default Re: Best Insulation for Walls/Ceiling

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Originally Posted by aksotar View Post
Cut thin strips of thinsulate and pull them thru the roof beam channels (suck a string thru with a vacum cleaner), I used a hydrophobic loose polyester fill (for quilts & stuffed animals) and stuffed it into hard to get to hollow spaces.....
Yup...doing that for the easy to access ribs, looking for what works best to "pack" into spaces where thinsulate strips are really not as conducive.
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Old 03-31-2019, 08:12 PM   #64
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Default Re: Best Insulation for Walls/Ceiling

the poly fill in difficult areas works just fine here in Alaska..... especially considering the temp differences and condensation potential from warm interior and cold metal skin...
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Old 04-01-2019, 03:05 AM   #65
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Default Re: Best Insulation for Walls/Ceiling

Dead air spaces.

The reality of a 2 inch Poli iso insulation sheet is that it wont bend, it's a rigid sheet, a hydrophobic monolith.

It will hold it's form for your forever.

Yes you glue it and stick pin it to the sides of your van and yes you seal it with spray can foam and yes you trim that flat and yes you foil the the edges but in the end you have a half-assed dead air space behind it because while the sheet is tight the walls aren't perfectly flat. Nothing is completely tight so air is going to move behind it. And that's good for evaporation. Loose insulation or flexible insulation will follow the walls...like a sponge or a plastic or paper sheet.

Also your choice of wall covering over Poli iso will also not fit super tight, there will be an airspace. Now the vents in the walls will still work and deal with any condensation. Condensation will not be trapped, held or absorbed.

Park your machine in the sun, the exterior wall is going to heat up and vaporize the water, same for the interior side especially if you put some heat in the van or the sun heats up the interior thru the windows.

And same for the roof. Heat will drive out the moisture using the air spaces. You would have a difficult time trapping water because it is just plain strange. But sucking it up using capillary action...now water runs up hill.

Don't panic, water is organic and it is a weird as **** compound held together by a polar covalent bond and so it has some very unique properties.

Want to become an expert?

https://chem.libretexts.org/Bookshel...rties_of_Water

https://en.wikipedia.org/wiki/Water

Think it through and remember.

https://en.wikipedia.org/wiki/KISS_principle


bill
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Old 04-01-2019, 03:15 AM   #66
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Default Re: Best Insulation for Walls/Ceiling

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Originally Posted by billintomahawk View Post
....................
Don't panic, water is organic and it is a weird as **** compound held together by a polar covalent bond and so it has some very unique properties........bill
I thought a definition for organic is that its molecule needs to contain at least one atom of carbon, water doesnít have one so it seems it is an inorganic. Not a big issue regarding insulation.
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Old 04-01-2019, 02:59 PM   #67
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Default Re: Best Insulation for Walls/Ceiling

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I thought a definition for organic is that its molecule needs to contain at least one atom of carbon, water doesnít have one so it seems it is an inorganic. Not a big issue regarding insulation.
Thanks George.
Technically as in organic chemistry I think you are correct.

Water is just along for the ride.

b
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Old 04-02-2019, 11:21 PM   #68
AWL
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Default Re: Best Insulation for Walls/Ceiling

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Originally Posted by GSWatson View Post
Iíll one up you, Bill I did 1Ē polyiso with GS (used the Applicator gun for greater control of the bead, and easier on the fingers than that little plastic tab), used vinyl tubing extension for the A pillars, and THEN went over everything with Thinsulate. The polyiso cost me about $200 extra, but it stiffened the sides and the roof considerably. Maybe overkill, but cheap considering the cost of everything else.

Iím interested in seeing a year-long test of wool vs Thinsulate in a van wall.


Greg
Hi Greg,
Cant help on the thinsulate but you can see a video on our instagram page that show the floor coming up after 2 years. Temperature ranges over the period in use would have been below 0F up to 115F or so. Batts were just as we left them.
Nice day,
Andrew
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Old 04-02-2019, 11:23 PM   #69
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Default Re: Best Insulation for Walls/Ceiling

Quote:
Originally Posted by Shawn182 View Post
OK, have another twist of a question. I am doing Thinsulate throughout...but as I install there are tons of nooks, crannies, and holes that I am trying to figure out what is best to shove in there. Strips of thinsulate don't seem all that practical or effective bunched up...so what is the best option to pack those ribs and such?...break up some wool?...shred off scrap thinsulate of the scrim?...Denim?

One of the objective is to keep heat OUT in hot climates so wanna pack something in there while walls are open.


We're bias but wool works great in all the nooks and crannies. Would caution against denim given its inherent challenges with moisture.
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Old 04-04-2019, 06:03 AM   #70
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Default Re: Best Insulation for Walls/Ceiling

Quote:
Originally Posted by Shawn182 View Post
Yup...doing that for the easy to access ribs, looking for what works best to "pack" into spaces where thinsulate strips are really not as conducive.
You'll have plenty of smaller scraps (corners) that you cut off larger pieces when you trim them to size. Use those to loosely fill the enclosed areas by poking them in with flexible a stick. The scrim is handy in this situation because it will keep the stick from poking through so you can run the pieces way up into the cavities. You don't need to 'pack' these areas because Thinsulate(TM) SM600L will continue to fluff up from vibration while you drive. It will almost double in size (from it's as-shipped compressed state) over time so as long as the pieces stay put while you install it then it will eventually fill the space. This is also true for the strips that you pull or poke in. It is not necessary to pack it tightly due to the subsequent expansion. Feel free to call if you need further assistance.

All the best,
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