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Old 01-27-2014, 11:50 PM   #101
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Re: Smells Like Teen Spirit: Conversion of 1999 Thomas MVP

If I were putting an over-roof as in Nat's second drawing, I would not have the openings shown in the normal roof. That might allow too much air transfer out of living space or trapped air insulation space, and let too much heat out in cold weather. That might defeat the purpose of the roof insulation in winter, though the flow would probably help with keeping cool in summer. But side-to-side (or side to top vent) air movement between the two roof layers should be enough to keep down the heating/cooling demands on the normal roof. Check out how Elliot covers Millicent with a frame that supports overhead tarps at Burning Man.

I would insulate the roof as you have done (or foam it), BusKote the exterior roof, and then put solar panels and/or a roof deck to shade the bus roof. These additions would serve a dual purpose in doing so.

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Old 01-28-2014, 12:38 PM   #102
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Re: Smells Like Teen Spirit: Conversion of 1999 Thomas MVP

I'm not doing a roof over my roof or a balcony or any of that stuff, I am just trying to find out what would be best for what I am doing.

Plastic: Good at keeping moisture from inside from getting into insulation, good at keeping any leaks from dripping through, but if the insulation ever gets wet it will have a hard time drying out.

Rosin paper: Breathes somewhat, will probably keep leaks out to an extent but could get waterlogged, insulation will dry out easily if it gets wet.

Tyvek: Breathes well, lets no leaks through, insulation will dry out if it gets wet.

I currently have a few leaks in my roof, small ones, that need to be fixed. I would fix them now but there is snow everywhere, and it has been / will continue to be below freezing most days, so more coats of elastomer are out of the question (water-based) and most sealants won't work. So I need something that will breathe from the insulation to the inside to dry out once I do get the leaks fixed. I am not concerned about short term water exposure. This is why I was considering tyvek.
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Old 01-28-2014, 03:02 PM   #103
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Re: Smells Like Teen Spirit: Conversion of 1999 Thomas MVP

Quote:
Originally Posted by porkchopsandwiches
Yesterday, I picked up 10 pieces of foam board polyiso foil-backed insulation, 2" thick, and got started putting it in the ceiling. Within about 2 hours, I got this far:

It goes pretty quickly when you don't have to worry about fasteners or adhesives. I turned on the kero heater and it already feels warmer.

Opinion: I was thinking about putting some sort of barrier (tyvek or plastic sheet?) between the insulation and metal ceiling panels, since the metal panels are perforated and could let small particles of insulation dust through, and there is a decent bit of this since I used a circ caw to score it so it would bend. Is this a good idea? I plan on sealing any air gaps with foil tape.
If you are not using fasteners or adhesives, how are you holding it up?
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Old 01-28-2014, 03:41 PM   #104
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Re: Smells Like Teen Spirit: Conversion of 1999 Thomas MVP

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If you are not using fasteners or adhesives, how are you holding it up?
I friction-fit it in between the ribs of the ceiling for the bigger pieces. Smaller pieces will be taped or glued, then everything will be squished between the inner / outer skins eventually.
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Old 01-30-2014, 07:04 PM   #105
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Re: Smells Like Teen Spirit: Conversion of 1999 Thomas MVP

Sorry about down time...buy latex gloves for when you mess with great stuff.....seriously....I always say that after hitting the spray nozzle 1st time
And week later still peeling it off....not as bad as using rust convertor with no gloves...sheesh...purple hands for a week

Yeah I tend to actually get into my work
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Old 01-30-2014, 07:45 PM   #106
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Re: Smells Like Teen Spirit: Conversion of 1999 Thomas MVP

Roger the rubber gloves...and add Gorilla Glue (or any urethane glue) to the list. Turns your skin black. Cannot be scrubbed or solvented off. Only comes off when the skin comes off.

More than once I've used sand paper to try and clean my hands. Have I finally learned to NEVER use it without gloves???...well...
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Old 01-30-2014, 07:47 PM   #107
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Re: Smells Like Teen Spirit: Conversion of 1999 Thomas MVP

Quote:
Originally Posted by bansil
Sorry about down time...buy latex gloves for when you mess with great stuff.....seriously....I always say that after hitting the spray nozzle 1st time
And week later still peeling it off....not as bad as using rust convertor with no gloves...sheesh...purple hands for a week

Yeah I tend to actually get into my work
Hah, thanks. I ALWAYS forget to use gloves. When I was sealing holes on the floor using rivets / urethane based automotive seam sealer, I was peeling that stuff off for 3 days. The oil-based paint i did the floor with was on my hands for easily 10 days. Both things work great and you can tell by how they linger.

The latex paint on the other hand peels off instantly, but hey, its cheap.

I almost never wear gloves when working on cars / engines though, it really bothers me for some reason and messes with my mojo
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Old 01-30-2014, 09:40 PM   #108
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Re: Smells Like Teen Spirit: Conversion of 1999 Thomas MVP

Quote:
Originally Posted by porkchopsandwiches
I would have sprayed the whole thing on the inside if it wasn't for how damn expensive it was. The foam board Iím using, at $31 for 4x8 sheet ainít exactly cheap....
How thick is the foam board youíre using?

If theyíre only an inch thick, then the cost for 600 square feet of one-inch-thick insulation is $581. The spray foam kits are about $150 more than that (including the shipping charges) and you donít have to spend anything extra on cans of Great Stuff. Plus, the spray foam adheres directly to the metal, preventing any condensation on the interior surface.

Obviously, this math doesnít add up if youíre using thicker boards.
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Old 01-30-2014, 10:15 PM   #109
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Re: Smells Like Teen Spirit: Conversion of 1999 Thomas MVP

If I had it to do over I'd get a part time job to pay for the spray foam!!!! I don't think I'll EVER get rid of the little white foam balls that come with cutting and installing foam board--to say nothing of the fact that I'll always have to worry about moisture collecting in the unfilled areas.
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Old 01-31-2014, 02:02 AM   #110
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Re: Smells Like Teen Spirit: Conversion of 1999 Thomas MVP

Quote:
Originally Posted by PDBreske
Quote:
Originally Posted by porkchopsandwiches
I would have sprayed the whole thing on the inside if it wasn't for how damn expensive it was. The foam board Iím using, at $31 for 4x8 sheet ainít exactly cheap....
How thick is the foam board youíre using?

If theyíre only an inch thick, then the cost for 600 square feet of one-inch-thick insulation is $581. The spray foam kits are about $150 more than that (including the shipping charges) and you donít have to spend anything extra on cans of Great Stuff. Plus, the spray foam adheres directly to the metal, preventing any condensation on the interior surface.

Obviously, this math doesnít add up if youíre using thicker boards.
2" thick, R-value of 13.1.

Quote:
Originally Posted by ol trunt
If I had it to do over I'd get a part time job to pay for the spray foam!!!! I don't think I'll EVER get rid of the little white foam balls that come with cutting and installing foam board--to say nothing of the fact that I'll always have to worry about moisture collecting in the unfilled areas.
I agree, but my full-time job is barely able to fund this...I may be selling my car when I depart in (hopefully) June
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