How do you insulate a cathedral ceiling?
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How do you insulate a cathedral ceiling?
Raoul Lions
Oct. 19, 2019Last updated: Aug. 7, 2020
给大教堂的天花板通风或不通风。
I'm leaning towards not venting my cathedral ceiling and using closed-cell spray foam insulation. My walls are double 2x4 stud walls 12 inches deep and will have 2-3 inches of closed cell spray foam insulation to create a air and vapour barrier first, then the rest of the cavity will be filled with dense pack cellulose insulation, with an intello vapour barrier holding cellulose all in.
我想知道我是否可以对拱形天花板做同样的处理?还是直接用闭孔泡沫隔热材料更好?
The builder is using 16.5 deep trusses 24” off centre, I want to achieve R-80 in roof.
The coat ofcontinuous insulationalways works on the outside ofdense packed cellulose insulationby ensuring that the dew point is never attained within the cellulose. That said, continuous is just that, and roof rafters tend to create thermal bridges. Even with important levels of rigid insulation in the roof, it is best practice to double strap over the roof and vent anyways. Better to be safe than sorry.