Just like to get some thoughts on this product....(ignoring
price)......using this in addition to the normal fiberglass
batts.....so bascially this clip-vent system would just replace those
standard vent chutes...using this with the standard 1" DOW Blue
Styrofoam.,... (located in the Houston area)
Well, ignoring cost, it seems like a superior solution. For one
thing, it makes a channel that is essentially the full width of the
rafter bay, which many of the chutes don't.
My only concern would be lack of fire resistance. I don't think
unprotected foam board is allowed in many jurisdictions.
Well my opinion may not be worth much to you because my experience is
in cold climates. Looks like a great setup for a cathedral ceiling.
Might be a waste of money for the typical unheated attic in my area,
where the chutes just go for a few feet along the wall plate area. I
prefer to get cardboard chutes, since they install much easier and are
also vapor permeable. Now maybe in a hot climate, using foil faced
polyiso foam, they'd be the greatest thing since sliced bread.
I am doing something VERY similar in my addition with a cathedral
ceiling. I used 9 1/2" I-joists for the ceiling joists, and 3/4"
polyiso board against the bottom of the top flange of each I-joist,
forming a "chute" that is 1 1/2" deep. Below that, I used R-25
unfaced batts, giving the ceiling an R-value of just under 30. Great
for a 10" thick cathedral ceiling in WI.
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