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Old 01-24-2014, 01:56 PM   #91
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Re: Smells Like Teen Spirit: Conversion of 1999 Thomas MVP

I think I made a mistake when I ordered the LED boars, I noticed your boars have only 24 LEDs the ones I ordered has 36, I'm wondering if they are too big for the dome lenses. The website does not show the dimensions of the board, what do you think?
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Old 01-24-2014, 07:43 PM   #92
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Re: Smells Like Teen Spirit: Conversion of 1999 Thomas MVP

Suggestion: also have a main switch near your bed too.
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Old 01-25-2014, 02:05 PM   #93
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Re: Smells Like Teen Spirit: Conversion of 1999 Thomas MVP

Quote:
Originally Posted by juliol
I think I made a mistake when I ordered the LED boars, I noticed your boars have only 24 LEDs the ones I ordered has 36, I'm wondering if they are too big for the dome lenses. The website does not show the dimensions of the board, what do you think?
You could flush mount them to the surface of the metal bit (assuming yours are the same as mine) and the plastic cover will probably still fit over them. I just thought these were bright enough so I didn't want more LEDs haha. They will probably be fine.

Quote:
Originally Posted by sdwarf36
Suggestion: also have a main switch near your bed too.
Yeah, not a bad idea. Though my wiring plans are complex enough already, haha. Thanks.
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Old 01-27-2014, 10:00 AM   #94
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Re: Smells Like Teen Spirit: Conversion of 1999 Thomas MVP

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.
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Old 01-27-2014, 02:45 PM   #95
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Re: Smells Like Teen Spirit: Conversion of 1999 Thomas MVP

Nat, I remember reading in other similar discussions people saying that the problem with a vapor barrier is that if any moisture should get behind it, that moisture will likely be trapped there and create problems. I'm not claiming to be an expert in this area by any means, and I'm curious to hear what others have to say about it.
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Old 01-27-2014, 03:54 PM   #96
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Re: Smells Like Teen Spirit: Conversion of 1999 Thomas MVP

I have to agree with Dan on this, if the roof can't breath where does the moisture from heat/cool cycle go? sure seems to me that it would end up being a condensation mess (I have no formal training in condensation studies)
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Old 01-27-2014, 05:15 PM   #97
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Re: Smells Like Teen Spirit: Conversion of 1999 Thomas MVP

The MCI buse scheduled to ship to Saudi years ago had an extra air gap roof made of alum, I plan to have deck and solar cool my roof by this summer
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Old 01-27-2014, 07:20 PM   #98
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Re: Smells Like Teen Spirit: Conversion of 1999 Thomas MVP

In a perfect world, there would not be any condensation since you have enough insulation between the roof and the vapor barrier that condensation does not occur. But Murphy's law insures that our world is not always perfect and somehow, despite our best efforts, a tree branch falls during a storm, or debris from a gravel truck hits the roof, and our glorious elastomeric roof coating is breached, and then rain water finds it's way into that cavity between the metal roof and the vapor barrier, and then the dreaded mold starts to grow in there. I didn't do anything with my ceiling due to headroom issues, and just used those "Hy-tech" insulating beads in my paint on the outside of the roof, but on my floor I used Red Rosin Paper as a substitute for the vapor barrier. At the time I was doing my conversion, this product was being tauted on this forum by some as the answer to the problem. It repels moisture to some extent, but also breathes. The analogy would be that a plastic vapor barrier is to a rain poncho, as Red Rosin Paper is to GoreTex. Maybe that will make sense to somebody...
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Old 01-27-2014, 07:36 PM   #99
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Re: Smells Like Teen Spirit: Conversion of 1999 Thomas MVP

What abou tyvek? I think it is supposed to breathe but not let liquid water through. It's expensive but I don't need to wrap a house so it shouldn't be too bad. That way if there is a small roof leak, it follows to the end of the tyvek and goes into the sort of internal gutter my bus has over the windows (behind the roof material) then it would evaporate. Then the insulation could dry rather than any moisture from leaks or whatever staying Between the ceiling and outer skin.

Even if I used plastic, there would still be breathing room around the edges so it could probably breathe somewhat, jus not as much. How does that sound?
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Old 01-27-2014, 07:41 PM   #100
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Re: Smells Like Teen Spirit: Conversion of 1999 Thomas MVP

Also, tyvek is much more flame retardant than most other plastic sheeting I think.
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