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Old 04-26-2018, 01:07 PM   #1
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Spray foam insulation on walls, ceiling, and floor?

I'm looking at building a skoolie for full-time living in an RV park. I've ended up in the hospital from black mold in crappy apartments enough for this lifetime, and if I have to build my own, so be it!

Blown in closed cell foam (image link) looks like the right solution - it's stable, the R-value is high, it cuts noise, and - best of all - it's mildew resistant. DIY friendly, too. But I've never worked with the stuff, and am concerned about trapping moisture in a fashion that'd just make more mold and rust through the floor. The loss of headroom is worrying, too - regardless of bus, I don't really have the resources for a roof lift.

This bus will likely end up in the Southwest in 120F heat, and insulation is a big deal. Can anyone suggest how best to tackle this problem?
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Old 04-26-2018, 11:33 PM   #2
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Originally Posted by Jshaul View Post
I'm looking at building a skoolie for full-time living in an RV park. I've ended up in the hospital from black mold in crappy apartments enough for this lifetime, and if I have to build my own, so be it!

Blown in closed cell foam (image link) looks like the right solution - it's stable, the R-value is high, it cuts noise, and - best of all - it's mildew resistant. DIY friendly, too. But I've never worked with the stuff, and am concerned about trapping moisture in a fashion that'd just make more mold and rust through the floor. The loss of headroom is worrying, too - regardless of bus, I don't really have the resources for a roof lift.

This bus will likely end up in the Southwest in 120F heat, and insulation is a big deal. Can anyone suggest how best to tackle this problem?
Green foam is I think the spray foam that I plan to use for the walls and ceiling but I am going with rigid for the floor because it seems a lot easier. You have to cut off the overspray which has got to be easier with the ribs as a guide. The floor has no ribs.
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Old 04-26-2018, 11:43 PM   #3
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Depends how tall you are man, I'm 6'4" I can't insulate without a roof raise even in a high roof bus but a guy 5'2" no prob

You could always spray a bedliner type product over your insulation to seal it, but it seems like over kill.

Keep the humidity down inside mold doesn't grow dry
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Old 04-27-2018, 07:12 AM   #4
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Depends how tall you are man, I'm 6'4" I can't insulate without a roof raise even in a high roof bus but a guy 5'2" no prob

You could always spray a bedliner type product over your insulation to seal it, but it seems like over kill.

Keep the humidity down inside mold doesn't grow dry
Closed-cell foam is already sealed.
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Old 04-27-2018, 11:03 AM   #5
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I've been calling around for estimates on spray foam and have been hearing much higher prices than I was expecting.... First estimate I got was $1500 for ceiling and walls (not including windows).
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Old 04-27-2018, 12:01 PM   #6
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I've been calling around for estimates on spray foam and have been hearing much higher prices than I was expecting.... First estimate I got was $1500 for ceiling and walls (not including windows).
brokedown,
The guy that did my bus last year did an outstanding job, at half the price anyone else quoted, and operates out of St Petersburg, FL





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Old 04-27-2018, 12:37 PM   #7
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brokedown,
The guy that did my bus last year did an outstanding job, at half the price anyone else quoted, and operates out of St Petersburg, FL





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And that price was?
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Old 04-27-2018, 12:40 PM   #8
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I remember your post about it, unfortunately there is no way I can get the bus to St Pete at this stage of the conversion! But your experience is what I'm comparing against.
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Old 04-27-2018, 08:33 PM   #9
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Depends how tall you are man, I'm 6'4" I can't insulate without a roof raise even in a high roof bus but a guy 5'2" no prob
I'm 6' flat, so I could get away with some of the taller buses without doing a lift. The extra space would be nice, but I'm already at the limit of my mechanical ability. If I can find one with a lift for sale, I might buy it, but I'm not optimistic with my ~$5,000 budget.

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Closed-cell foam is already sealed.
Yes, but the area over and around it? Homes usually breathe a lot better than cars, and I'm petrified of condensation collecting under the floor. I don't really understand home construction very well.

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I've been calling around for estimates on spray foam and have been hearing much higher prices than I was expecting....
You can get DIY kits starting at $650. (I would say "How hard could it be?", but that always jinxes things...)

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]The guy that did my bus last year did an outstanding job, at half the price anyone else quoted, and operates out of St Petersburg, FL
That is friggin' gorgeous.

Out of curiosity, how would you feel about living in your bus in Las Vegas, NV in July?
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Old 04-27-2018, 09:49 PM   #10
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Yes, but the area over and around it? Homes usually breathe a lot better than cars, and I'm petrified of condensation collecting under the floor. I don't really understand home construction very well.

You can get DIY kits starting at $650. (I would say "How hard could it be?", but that always jinxes things...)
The temperature of a surface relative to the temperature of a room will not be affected simply by trying to seal the foam. You have to address the issue with ventilation. having done your best to insulate and eliminate thermal bridges.

Condensation won't collect under the floor but it will collect on windows and any parts substantially colder than warm, moisture-laden air.

You will need at least two of those kits to insulate any decent sized bus. The DIT route doesn't save a great deal of money. It is cheaper, but you have to do all the work yourself and it still works out about twice the cost of foam-board. If you fit the board correctly, and seal the edges well, it will perform almost as well as spray-foam. Spray foam is superior, but at a price and the cost-benefit might be not be enough for you to commit the funds.
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