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Old 03-04-2014, 01:02 PM   #11
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Re: Insulation added to outside of roof?

LOL, just kidding...kind of. This wil probably cost more than you paid for your bus.
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Old 03-04-2014, 02:14 PM   #12
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Re: Insulation added to outside of roof?

Quote:
Originally Posted by crazycal
This wil probably cost more than you paid for your bus.


No idea of the cost...haven't gotten that far yet. But I definitely need to keep the budget reasonable. If it costs too much I'll have to nix the idea.
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Old 03-04-2014, 02:32 PM   #13
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Re: Insulation added to outside of roof?

Unfortunately, nothing good is cheap.

6 pound foam is $3 a square foot by 1 inch thick.

8' wide X 40' long = 320 square feet.

$1056 for 1 inch thick.

$1584 for 1.5" thick.



As long as your not walking on it, 2 pound would do fine.

2 pound foam is $1.10 a square foot by 1 inch thick.

$352 for 1 inch thick.

$528 for 1.5" thick.


As the density go's up, the coverage go's down. 4 pound go's half as far as 2 pound, ect.

Nat
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Old 03-04-2014, 06:34 PM   #14
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Re: Insulation added to outside of roof?

That 2 pound sounds affordable. The 6 pound seems steep though.

Hat tip to Lorna for turning me on to this article:

http://www.busnut.com/artgm04.html

Interesting point the author makes about expansion and contraction. I wonder if this issue could cause spray foam to delaminate from the exterior bus skin?

Probably wouldn't be any cheaper with that aluminum cover but might look better. I wouldn't need to insulate the outside of the end caps because they're made of moulded fiberglass and I could fill them with insulation when I remove the flasher lights.
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Old 03-04-2014, 11:52 PM   #15
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Re: Insulation added to outside of roof?

Quote:
Originally Posted by nat_ster
Unfortunately, nothing good is cheap.

6 pound foam is $3 a square foot by 1 inch thick.

8' wide X 40' long = 320 square feet.

$1056 for 1 inch thick.

$1584 for 1.5" thick.



As long as your not walking on it, 2 pound would do fine.

2 pound foam is $1.10 a square foot by 1 inch thick.

$352 for 1 inch thick.

$528 for 1.5" thick.


As the density go's up, the coverage go's down. 4 pound go's half as far as 2 pound, ect.

Nat

I was going to guess a couple bucks a foot. I was checking prices recently and it was expensive. Then you need to do the fiberglass.
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Old 03-05-2014, 04:22 PM   #16
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Re: Insulation added to outside of roof?

Quote:
Originally Posted by Locutus
Interesting point the author makes about expansion and contraction. I wonder if this issue could cause spray foam to delaminate from the exterior bus skin?
Spray foam is basically plastic. It will contract and expand at the rate of the substrait it was sprayed onto.

So far I have never seen spray foam delaminate from anything. It even sticks to plastic vapor barrier.

I had to do two small demo jobs where a home owner made a big mess of wiring, plumbing, and studs behind a planned kitchen counter.
I started trying to remove individual wires, pipes, ect to make the needed changes. Even using a keyhole saw, utility knife, claw hammer, ect.
It was so hard to get apart, it took 4 times as long. My 10 pound sledge hammer, and the reciprocating saw were the main players. I had to cut the foam vertically between every stud, then smash the studs out with the 10 pound hammer. I had to remove everything they had done because everything was encased in a semi flexible, impact absorbing mass.

If all homes were built with this stuff, they would be 50% stronger. In our blue prints, when a home calls for foamed walls, the engineer will sometimes remover sheeting from interior wind thrust walls due to how stiff the structure becomes.

Nat
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Old 03-13-2014, 08:34 AM   #17
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Re: Insulation added to outside of roof?

didn't someone glue down 1/2 poly panels and then free floated a thin aluminum skin over it?(only attached at sides above windows and front/back)
the edges over lapped to move with expansion/contraction

It was down years ago and was still working after atleast 10 years on the road
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Old 04-22-2015, 09:02 AM   #18
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I keep thinking about going with this spray on roof foam. I love the idea and it seems like what I need. I am hoping cost is a regional thing. Since I am in Central FL but plan to travel, I could get prices based on location and wait until I get where it is cheaper.
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Old 04-22-2015, 09:05 AM   #19
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Since I'm right near you, maybe we could get another bus owner or two to join us on trying to get a volume discount.
Worth a shot. I will be wanting insulation in a couple months.
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Old 02-13-2016, 06:38 PM   #20
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Has anyone actually used spray foam on the outside/ rooftop? How has it worked... sounds interesting
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