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Old 09-30-2014, 09:51 PM   #1
Skoolie
 
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Spray Foam Question

Hello Everyone! Quick question about spray foam and thermal breaks. We will be strapping the walls with strips of 3/4" plywood for our thermal break per instructions of many posts on the forum. We will be having spray foam done soon. Do we strap the walls and ceiling first and have the foam built up to the level of the wood strips or do we spray foam first and have the foam built up to the level of the steel support beams in the bus?

Does my question make sense? I can take pics if it doesn't!

1992 Bluebird.

Thanks!

Jeremy
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Old 09-30-2014, 10:31 PM   #2
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Re: Spray Foam Question

my bus had been previously done with spray foam. here is a picture of how the inside looks. the foam goes to the steel, boards attached to the same.

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Old 09-30-2014, 10:56 PM   #3
r_w
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Re: Spray Foam Question

You can do either way, but if it goes flush with your wood strips it can SQUEEK against your paneling.

My vote is to do it flush with hoops and then use a sound proofing (wool or cotton) in between the strips if you have the dough.
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Old 10-01-2014, 10:14 AM   #4
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Re: Spray Foam Question

I attached 3/4" strips perpendicular to the bus ribs then spray foamed under the wood and over the ribs, then paneled over. No squeaks. If I were to do it again, I'd do the same thing, except I'd hire a pro spray foamer. It would have been around the same price, but it would have been less wasteful and tidier. Also, the stuff the pros use expands more than the kit stuff and thus would get between the wood strips and the metal roof better. That was quite a challenge
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Old 10-01-2014, 11:29 AM   #5
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Re: Spray Foam Question

Did you insulate INSIDE the ribs? Is that possible with spray foam?
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Old 10-01-2014, 11:47 AM   #6
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Re: Spray Foam Question

Quote:
Originally Posted by r_w
Did you insulate INSIDE the ribs? Is that possible with spray foam?
Nope, not possible unless you take the outside skin off. I insulated over the ribs. I would be surprised if insulating inside the ribs would actually do any good. Since they are directly connected to the outside metal they act as a thermal bridge from the bus skin to the inside. Foaming the hollow inside of the ribs would not stop heat/cold from travelling through the metal, around the insulation to the inside of the bus. Foaming OVER the ribs, on the other hand, does work. Put as much as you can over those things..

Studs in a house have a similar effect (thermal bridging), but we don't notice it as much since wood isn't as good of a conductor. Here are some thermal images of what I'm talking about.

Inside of house is warm, outside is cool:


Inside of house is cool, outside is warm:
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Old 10-01-2014, 11:49 AM   #7
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Re: Spray Foam Question

Quote:
Originally Posted by jazty
I attached 3/4" strips perpendicular to the bus ribs then spray foamed under the wood and over the ribs, then paneled over. No squeaks. If I were to do it again, I'd do the same thing, except I'd hire a pro spray foamer. It would have been around the same price, but it would have been less wasteful and tidier. Also, the stuff the pros use expands more than the kit stuff and thus would get between the wood strips and the metal roof better. That was quite a challenge
Thanks Jatzy. I think this is what I will do. It will give an extra 3/4" of insulation all around!
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Old 10-28-2014, 09:43 PM   #8
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Re: Spray Foam Question

We are dropping the bus off to get sprayed in two more days... I have another question. Does anyone know what kind of heat that spray foam can withstand? I was wondering if it would be possible to spray foam the inside of our engine hatch/lid on our FE TC2000? The foam noise/heat insulation thingy is falling apart. Figured spray foam could be a good replacement if it can withstand the heat. Anyone ever try this?
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Old 10-28-2014, 10:34 PM   #9
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Re: Spray Foam Question

I think you will get better sound protection with a dense material --like horse stall rubber mat. The foam stuff is real good at quieting high pitch noise, but the low pitch noise of a (diesel) bus is better quieted with very dense material--lead is best. Jack
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Old 10-29-2014, 12:21 PM   #10
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Re: Spray Foam Question

Quote:
Originally Posted by ol trunt
I think you will get better sound protection with a dense material --like horse stall rubber mat. The foam stuff is real good at quieting high pitch noise, but the low pitch noise of a (diesel) bus is better quieted with very dense material--lead is best. Jack
Thanks Jack!
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