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Old 06-12-2015, 01:09 PM   #51
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Holy moly.. How did I not even think of this??!! There already is so much data out there for this problem thanks to metal studs in houses! It's not 100% applicable (we aren't using drywall or exterior plywood; sheet metal radiates heat more), but I think it's worth looking at until Austin builds a computer model of the bus (which would be awesome).

IMPROVING ENERGY PERFORMANCE OF STEEL STUD WALLS

I like figure 8 in the above article: http://web.ornl.gov/sci/roofs+walls/...es/figure8.pdf
That's probably the closest representation of what is going on in my walls. Not exact, but close.


This PDF is less scientific, but has some pretty pictures
http://www.foamular.com/uploadedFile...MAL%20ONLY.pdf

Page 13 shows a good diagram of a typical bus wall.
Page 14 shows what most of us try to accomplish after removing the inner skin. (note, replace the phrase, "warm interior" with "warm or cold exterior" and it makes sense)
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Old 06-12-2015, 01:14 PM   #52
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Originally Posted by jazty View Post
Holy moly.. How did I not even think of this??!! There already is so much data out there for this problem thanks to metal studs in houses! It's not 100% applicable (we aren't using drywall or exterior plywood; sheet metal radiates heat more), but I think it's worth looking at until Austin builds a computer model of the bus (which would be awesome).

IMPROVING ENERGY PERFORMANCE OF STEEL STUD WALLS

I like figure 8 in the above article: http://web.ornl.gov/sci/roofs+walls/...es/figure8.pdf
That's probably the closest representation of what is going on in my walls. Not exact, but close.
Bus ribs will be much worse due to the thickness of the metal they are made from. Metal studs are made from a much lighter gauge steel.

Great starting point though.

Nat
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Old 06-12-2015, 01:19 PM   #53
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Grow some balls
I recently lost my left testicle to cancer. I find statements like that offensive.
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Old 06-12-2015, 01:20 PM   #54
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Elastomeric paint needs to be applied to the exterior of the bus, not the inside.
What elastomeric paint? Why not bedliner? And why not on the inside?
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Old 06-12-2015, 01:33 PM   #55
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I recently lost my left testicle to cancer. I find statements like that offensive.
Yep, I thought it was offensive as well. This isn't the place to educate people on how they should treat their wives. Never mind how it was offensive to women in general. I'm pretty sure it's against forum rules to post remarks of that nature here as well.
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Old 06-12-2015, 01:34 PM   #56
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What elastomeric paint?
It is a rubber like paint that is made for sealing small leaks in metal roofs.
There is even a few made just for buses like "Bus Cote". Almost every build here has used one form or another of the same product.

This is why the new members here need to go read a bunch of build threads before asking questions. All the info is there, waiting to be consumed and learned. Asking questions one at a time for each new member is a waste of every ones time, and important details get lost in the short answers given to some of these highly detailed topics.

All of your questions have been answered over and over again. In thread after thread after thread.

Pirate 4x4 calls this spoon feeding.

I only write this to help. I'm in no way trying to be mean, nasty, ignorant, ect.

Nat
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Old 06-12-2015, 01:43 PM   #57
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Originally Posted by austin1989us View Post
And why not on the inside?
Putting paint on the inside is only part of the process in dealing with interior rust. You need to scrape, wire brush, use a rust treatment, then paint. Painting on the inside will do nothing to seal leaks and prevent moisture from getting in the walls. That's an exterior job.

Elastomeric paints do a good job in reflecting the sun's heat away, since they are a blinding white colour. Their thick, rubbery nature probably also helps in that regard (slight insulating benefit). In addition, the fact that it is a thick, rubbery paint means it contributes to sealing the roof. I wouldn't trust it 100% for that purpose, but I'm confident it helps. You'll want to remove loose caulking, clean the roof, and reapply caulking to seal the roof properly. After that, many coats of elastomeric paint should keep things in good order.

Windows are also a point of water entry. You'll want to replace or re-caulk them as well... unless, again, this bus is meant to be a throw-away, short-term solution.

Nat is right about reading other build threads. You'll see discussion and great pictures that will answer all of these questions.

EDIT: I know... I'm guilty of spoon-feeding here.. For some reason, I just can't help myself today
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Old 06-12-2015, 01:43 PM   #58
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Having never done stuff like this before I don't even know the right vocabulary to use. When I search "elastomeric coating" I can find some useful threads. Didn't know that's what it was called. I figured something like bedliner would be water tight and rugged. I'd seen some of the threads about paint, but not much about water proofing.

I googled and found something called Sta-Kool 770 says it's good for metal roofs. Can it be painted over?
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Old 06-12-2015, 01:49 PM   #59
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I googled and found something called Sta-Kool says it's good for metal roofs. Can it be painted over?
Painting elastomeric paint will reduce it's effectiveness. You want it to be white.

I'd advise you to go to a local hardware store such as Ace Hardware and see what they sell. The one around here had several choices for elastomeric paints. Read the labels, see which one has the qualities you want at the price you're willing to pay.

I didn't know much about any of this stuff when I got started.. If you keep reading, you'll get new ideas. Go wander some hardware stores. Poke around an RV dealer, see what they've done. Then do the opposite
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Old 06-12-2015, 01:50 PM   #60
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Painting elastomeric paint will reduce it's effectiveness. You want it to be white.

I'd advise you to go to a local hardware store such as Ace Hardware and see what they sell. The one around here had several choices for elastomeric paints. Read the labels, see which one has the qualities you want at the price you're willing to pay.

I didn't know much about any of this stuff when I got started.. If you keep reading, you'll get new ideas. Go wander some hardware stores. Poke around an RV dealer, see what they've done. Then do the opposite
Cool beans. Thanks for the advice.
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