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Author Topic: EHP roll board???  (Read 4033 times)
Dallas
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« Reply #15 on: November 16, 2008, 03:22:43 PM »

John,
Reflectix is rated differently for different applications.


http://www.reflectixinc.com

http://www.reflectixinc.com/images/uploads/allpdfs/f41%20foil%20bubble%20lit%207%2004.pdf

and using the application for a metal building, (which probably approximates a bus), and considering I only have a 1/4" dead air space, I figure as a WAG that the R value is probably around 1. However it also works as a reflective barrier system which also helps.
However... I don't really believe all the hype that I've seen from these kinds of companies. I saw a few that touted the R value as "Up tp r-25" for foil-bubble-foil.
Reflectix is available at Lowe's and Home Depot and many other home centers.

The blue foam is available from Lowe,s and other places. It is a Dow Building systems product with an R-3 rating per 1/2"

http://www.lowes.com/lowes/lkn?action=productDetail&productId=15348-46086-15348&lpage=none

I cut the foam to fit between the ribs, using 3 layers. I also filled all the cracks and seams with canned spray foam insulation. The foil goes over the ribs, (which I covered with felt as a conduction barrier), and the edges of the foil are sealed together with aluminum foil HVAC tape.

Hopefully all of this gives me at least an honest R-9 rating. It seems to help quite a bit anyway.. we can heat the bus with 2 1500 watt space heaters and be in shirt sleeves down to about 20 if the wind isn't blowing and the nose isn't faced into the wind.. that part isn't done yet.
In the summer time, if we are in the shade, our two window A/C,s keep it comfortable inside up to about 95. If we had roof air or mini splits, I don't think we'd have a problem cooling at over 100

IHTH,
Dallas
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