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Posted by on July 31, 2006, 10:31 am
Thanks Larry. I am to the point of no return now, so I'll work during
the nights when it's cooler. The flexduct and sheet metal tees will
work nicely.
The only problem with prefabricated metal boxes is that my register
cutouts are about a inch from the joists and the flange will not fit.
Also, the boxes I have seen are lined with the fiberglass exposed
ductboard.
lp13-30 wrote:
> FWIW, if it was my house, I would have left it alone till December. Now,
> you are not only without a/c (unless you have a couple of window unit to
> use meanwhile), but you get to work in a 130+ deg attic also.
> Regardless, to answer your questions- sheet metal all the way is the
> best way to go. It can definitely be wrapped outside to R6, though for
> your area I would try to get R8 wrap. The easiest, quickest and cheapest
> route is a new ductboard plenum and new R8 flex ducts, with new sheet
> metal register boxes. You can either get new ductboard triangles, or use
> sheet metal Tees or Wyes with the flex. That is not the best way to go,
> but around here (San Antonio) that is what about 99% of the houses built
> in the last 20+ years have, so while not ideal, it will certainly work
> if properly designed. Good luck Larry
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