I'm looking for the newer thinking on this task because I've been thinking it anew and it's scheduled for this Friday.
Background facts: '80's single fam 2 1/2 story, whole house air, Panasonic 200 cfm vents (2 baths) on 2nd floor. Attic is fairly vented with new tab shingles, new ridge vent and scores of those 2" round soffit vents. And btw, the house sits on an unground spring and the roof sheathing is almost always wet on the underside in the winter. Two dehumidifiers run in the basement with springtime overflows. Bathrooms are mouldy and peely still, after I did the bath work 10 months ago. This new venting was planned to replace the 4" vinyl multi-bent hose to soffit.
This month I gave the roofers who put on the new roof, the Nutone black roof vent caps http://tinyurl.com/8hgt6k which they cut in. My job is connect the bath vents to the caps.
It seems the feds want an r-6 on vent pipes in attics. (Link) Aside from other moisture reducing tasks in the attic, my thought is to go 4" steel vent pipe, 3 screws, mastic, then wrapped with r-6 f.g. foil insulation. Why not a thermal bridge, say, 4" no-hub rubber coupling to break the heat/cold conduction? Why not pvc, maybe better?
Also, vent lit suggests a two foot long sweep coming out of the bath vent, to build up speed I guess. Does tight 90 cut that much? Distance from bath ceiling to roof, vertically, is about 4 feet.
Thoughts?
tia,
Victorian John
P.S. How do you guys copy a link to a text word that turns blue and we just click the word to bring up the link?
Background facts: '80's single fam 2 1/2 story, whole house air, Panasonic 200 cfm vents (2 baths) on 2nd floor. Attic is fairly vented with new tab shingles, new ridge vent and scores of those 2" round soffit vents. And btw, the house sits on an unground spring and the roof sheathing is almost always wet on the underside in the winter. Two dehumidifiers run in the basement with springtime overflows. Bathrooms are mouldy and peely still, after I did the bath work 10 months ago. This new venting was planned to replace the 4" vinyl multi-bent hose to soffit.
This month I gave the roofers who put on the new roof, the Nutone black roof vent caps http://tinyurl.com/8hgt6k which they cut in. My job is connect the bath vents to the caps.
It seems the feds want an r-6 on vent pipes in attics. (Link) Aside from other moisture reducing tasks in the attic, my thought is to go 4" steel vent pipe, 3 screws, mastic, then wrapped with r-6 f.g. foil insulation. Why not a thermal bridge, say, 4" no-hub rubber coupling to break the heat/cold conduction? Why not pvc, maybe better?
Also, vent lit suggests a two foot long sweep coming out of the bath vent, to build up speed I guess. Does tight 90 cut that much? Distance from bath ceiling to roof, vertically, is about 4 feet.
Thoughts?
tia,
Victorian John
P.S. How do you guys copy a link to a text word that turns blue and we just click the word to bring up the link?
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