I’m in the planing stages of building a retirement home in NH. I like to understand “things” when I talk to tradesmen. I would like to know how to create a “cold roof” if sissor trusses are used for the roof?
Thanks in advance for sharing your knowledge.
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The bottom cord of a scissors truss is usually 1/2 of the pitch of the roof. That gives room for plenty of insulation above. The thing to watch out for is enough heal height at the walls, otherwise it will not leave proper clearence.
How should it be "vented" to crate the "cold" roof?
Soffit vents and ridge vents!
I was thinking with spray insulation (for higher R value) a second roof might be needed.
If you want a cold roof, why not just blow cellulose? That eliminates the need for second roof, if I understand you.
I will be honest with you. I don't like spray on foam. My house has foam from the 70's in it and I really don't believe they have concurred all of the bugs. Remember it is a 2 part process which leaves the final product subject to the skill of the operator.
I believe that you will be just as well served to use cellulose!
With spray foam, you don't have a ccold rof unless you strap it and do that secondary.But spray foam done right eliminates the need fo rth ecold roof
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Typing in something akin to 'cold roof' or 'cold roof trusses' might take you thru several cups of java.
Cheers
thanks
Might as well fill up the coffee pot 'cause there's plenty in there!
Might want to roam around the FineHomebuilding main site and search there also
as I know there have been a number of articles in the magazine concerning cold roofs over the years.
Edited 8/8/2009 1:18 pm ET by rez
Edited 8/8/2009 1:37 pm ET by rez