[Greenbuilding] [BULK] Re: Air Conditioning for Phoenix

[Keith Winston]

Yes, you can use the radiant barrier (which is just a mylar plastic film 
thing) to define the air barrier of the roof. Partly it comes down to 
insulation: if you're going to do blown foam, you'll need something to 
blow it against. If you use foam boards, you can get away without a deck 
PROBABLY: remember you've got to put something in there for racking 
forces, small steel let-in braces (sorry I forget the name) will do and 
install quick (single pass of a circular saw). But I think you already 
have a deck, so all this is moot?

Keith


Clarke Olsen wrote:
>    You can put steel panel roofing on purlins alone - without any roof 
> deck!
>    Trusses can be spaced further, and at non 8' modules. What could be
>    greener then not nailing down a few thousand sqft of plywood?
>    Clarke Olsen
>    Spencertown, NY
>
> On Jan 30, 2007, at 9:43 PM, Keith Winston wrote:
>>>
>> What about: put your metal roof on purlins (not all mftrs allow it, but
>> some do) to create an air channel underneath, vented top and bottom
>> (hopefully it's a simple roof -- include insect barriers in the vents).
>> Use a radiant barrier under it, pointing up.
>
>
>
>

-- 
Keith Winston
Earth Sun Energy Systems
Hyattsville, MD 20781
301-980-6325
send me mail at 
keith at the company below
www.EarthSunEnergy.com