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airschooled
Air-Schooled
Joined: April 04, 2012
Posts: 12721
Location: on a bike ride somewhere
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 Posted: Thu Nov 26, 2020 10:47 am Post subject: Re: Roof Insulation |
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| blue72beetle wrote: |
First five words were "Not gonna be a camper" and people lose their minds about vanlife  |
Some folks like talking more than conversing. This is just the electronic version.
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alaskadan
Samba Member
Joined: January 09, 2013
Posts: 1856
Location: anchor pt. alaska
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| Posted: Thu Nov 26, 2020 6:07 pm Post subject: Re: Roof Insulation |
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| Rmax is fine dude. We are all bored and nitpicking the nuances of different insulation to use. Chances are our vans will be taken care of better for the next 40 years than the previous 40 as they get rarer and more cherished. I'd say the worst part about using the rmax is its rigidity making impossible to install tight to the metal with no trapped ish moist air pockets behind it. |
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calvinater
Samba Member
Joined: September 06, 2014
Posts: 3327
Location: 802 The Pointless Forrest
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| Posted: Fri Nov 27, 2020 8:00 am Post subject: Re: Roof Insulation |
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| nemobuscaptain wrote: |
| calvinater wrote: |
| If you eliminate any air space , there will be no where for condensation to form. |
lol wut? If you have cold metal and humid warmer are inside, it will still form.
It still has condensation under there, you just don't SEE it. If you feel the insulation it will often be soggy.
theoretically it is possible to get a complete vapor barrier. realistically it's almost impossible to achieve. even manufacturers fail to achieve it. |
In the building trades it is known as eliminating the cold condensing area.
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malcolm2
Samba Member
Joined: September 28, 2011
Posts: 1272
Location: Mount Juliet, TN
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| Posted: Fri Nov 27, 2020 8:02 am Post subject: Re: Roof Insulation |
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I decided to do a small test. I weighed a hunk of R-Max. Soaked it in a bowl of water for 19 hours. Weighed it again. Same weight.
So I would say R-max does not absorb water.
BEFORE
DURING
AFTER
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My Toys: '75 Porsche 914, '92 Ski Nautique and now a 1972 VW Transporter Deluxe (punch list fixing) |
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ccpalmer
Samba Member
Joined: September 17, 2006
Posts: 3850
Location: Ann Arbor, Michigan
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| Posted: Fri Nov 27, 2020 6:11 pm Post subject: Re: Roof Insulation |
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| nemobuscaptain wrote: |
all buses should be campers.
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Very True!!
| airschooled wrote: |
Some folks like talking more than conversing. |
Also very true
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'71 Westy |
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SGKent 
Samba Member
Joined: October 30, 2007
Posts: 41031
Location: Citrus Heights CA (Near Sacramento)
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| Posted: Fri Nov 27, 2020 7:06 pm Post subject: Re: Roof Insulation |
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I wouldn't be that concerned about it soaking up water. I would be concerned about water wicking behind it and sitting there. Until you spend a night in a cold bus and wake up wit water all over everything on the shell you won't understand. See this rust? It is all from the inside out due to condensation inside layers in the top not drying out. It is a lot of work to get rid of it.
This is all from the inside out.
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nemobuscaptain
Samba Member
Joined: March 07, 2002
Posts: 3874
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kens4um
Samba Member
Joined: June 21, 2010
Posts: 1
Location: Inglewood, CA
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| Posted: Mon Dec 21, 2020 12:46 am Post subject: Re: Roof Insulation |
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| I am trying to insulate the front of my bus and used fiberglass before with no problem. Last year I put on double bubble reflective insulation contact cement to metal roof which gave me a 7 degree cooler ceiling. I am going to look for condensation though I would think contact cement would keep the condensation from reaching the roof..will respond if I see trouble... |
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Abscate
Samba Member
Joined: October 05, 2014
Posts: 22633
Location: NYC/Upstate/ROW
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| Posted: Mon Dec 21, 2020 5:40 am Post subject: Re: Roof Insulation |
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Great rant, worthy of bookmarking...with one correction
| Quote: |
| good bag can keep you comfortable well below zero real American degrees |
Dutch, Polish-German origin. That’s aboutAmerican as you can get.
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old DKP driver
Samba Member
Joined: March 30, 2005
Posts: 4145
Location: Los Gatos,Ca.
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| Posted: Mon Dec 21, 2020 9:31 am Post subject: Re: Roof Insulation |
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It’s 35 degrees here this morning with insulation. Does this really matter since
It’s winter time? Probably the same in the bus/camper in my garage 
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malcolm2
Samba Member
Joined: September 28, 2011
Posts: 1272
Location: Mount Juliet, TN
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| Posted: Mon Dec 21, 2020 2:57 pm Post subject: Re: Roof Insulation |
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| old DKP driver wrote: |
It’s 35 degrees here this morning with insulation. Does this really matter since
It’s winter time? Probably the same in the bus/camper in my garage |
The original thought I had in the OP was more about the heat. The sun beaming down on the huge metal roof and side panels heating up the interior.
But like an insulated Thermos.... It keeps hot things hot and it keeps cold things cold.... "How do it know?"
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My Toys: '75 Porsche 914, '92 Ski Nautique and now a 1972 VW Transporter Deluxe (punch list fixing) |
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