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Old 11-22-2013, 11:00 AM   #1
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Insulating question

To insulate my bus, I putting down 1 of foam board, then spraying in 2 on top.

My question is should I insulate first then cut out for windows, or put windows in and spray around them?
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Old 11-22-2013, 11:19 AM   #2
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Re: Insulating question

Quote:
Originally Posted by wmkbailey
To insulate my bus, I putting down 1 of foam board, then spraying in 2 on top.

My question is should I insulate first then cut out for windows, or put windows in and spray around them?
I say spray first, then cut out windows. Otherwise you have to mask, and also I think the sprayed fill would not end up level unless you built out a form to hold it. Too much hassle.
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Old 11-23-2013, 05:54 PM   #3
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Re: Insulating question

Need more info on what kind of windows, ect.

To properly trim your windows inside and out, they should not be free floating. You are going to need wood to shoot your finishing nails into. I would box in the openings with a 2x2 or the equivalent, and mask the surface around the window where your inside wall covering will get installed. That way you simply peal the tape off the studs\boxing to get a nice clean mounting surface. Then flush cut saw the excess that sits out passed the studs. That's how I do residential houses that we spray foam.

Here closed cell 2 pound foam cost $1.10 a square foot, one inch thick. That's around $13 a cubic foot. Whats the price there?

Nat
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Old 11-23-2013, 09:59 PM   #4
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Re: Insulating question

I'm using RV Insulated windows. They mount with a clamp ring. No framing needed.

I'm using foamit green. One 600 sqft kit for $627.97 = $1.05 sqft

http://www.sprayfoamkit.com/
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Old 11-24-2013, 09:16 AM   #5
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Re: Insulating question

Just curious do you have all your wiring done on the bus. I have rustled with the thought... do I run all the wiring in maybe a chase or leave it empty and pull it after you insulate?

This has been one of the things I have asked here and I guess didn't get the answer that sealed the deal. I know each build is different but I would think there is a step by step process to do this so you don't have to redo or waste money doing things out of step.
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Old 11-24-2013, 12:00 PM   #6
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Re: Insulating question

My wiring will be done outside the walls. Along a chase at the top near the roof line. I screwing the 1/4 plywood to the walls and will run the electrical under that.

The only thing that will run in the wall will be 12 VDC (Light switches and LED lights). Any 120 VAC outlets will be in a cabinet, either the kitchen or my computer desk. Even my refrig is 12 VDC.

So far the 120 VAC I will have is the hot water heaters, induction cook-tops, microwave convection oven and computers. Oh and an air conditioner.
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Old 11-24-2013, 06:15 PM   #7
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Re: Insulating question

Good idea.

Mine is pretty much following your plan as well. What you laid out makes sense. I think at times I loose track that I will be using 2 sheets of 1.75 thick polyiso to get my thickness. So if I use that on the sides it will leave a void when it transistions to the curve of the roof so I can use that as my chase...
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Old 11-24-2013, 07:01 PM   #8
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Re: Insulating question

Quote:
Originally Posted by wmkbailey
I'm using RV Insulated windows. They mount with a clamp ring. No framing needed.

I'm using foamit green. One 600 sqft kit for $627.97 = $1.05 sqft

http://www.sprayfoamkit.com/
Here using kits like that is more expensive then having a commercial company spray it on for us.

Nat
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Old 11-24-2013, 08:10 PM   #9
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Re: Insulating question

Quote:
Originally Posted by nat_ster

Here using kits like that is more expensive then having a commercial company spray it on for us.

Nat
I live near DC and it is much more expensive to have a pro do it for me. Almost twice the cost, about $2.00 sqft. I was told the cost could be higher because it is a small space, they need to get back the prep cost.
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Old 11-24-2013, 09:10 PM   #10
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Re: Insulating question

Perhaps you could drive the bus to a site where they're already setting up and spraying a house? That would likely make it quite appealing to the company. Easy cash.
I used the Spray It Green stuff and though it functions well, if I were ever doing it again I'd probably source the job out to a pro. I ended up with a whole lot of waste by the time I was done. The guys who do it all week long are just more skilled than a DIY person is likely to ever get..
It's a fun experience playing with the stuff, though!
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