John (Straub)--<br><br>what is your take on the conductivity of the fastener? it may sound trivial, but at 1 fastener per 2 sq ft (plus more at corners and openings, etc) there could easily be a thousand fasteners in a modest house. <br>
<br>look at it this way--the x section of 1000 - quarter inch screws is 49 sq in. Carbon steel has roughly 2 1/2 times the thermal conductivity of stainless steel...what's that in Btus/year?<br><br>-AA <br>