Quote:
Originally Posted by DickR
Doing that isn't necessarily best. It places a vapor barrier above the roof deck, preventing drying in that direction. Drying won't be a problem if the underside of the deck is vented, as with an unconditioned attic space or a cathedral ceiling with insulation up against insulation baffles that provide vent space. If the structure underneath is an insulated, unvented cathedral ceiling, there is no way for any incidental moisture that gets into the roof deck to dry out. However, code does call for a membrane to be applied over the bottom edges, up to a point two feet past where the wall is underneath.
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Thanks for the link.
Venting, of course, is a crucial key to a good roof.
Some/many just don't understand how to construct a new house with proper venting.
I see many new homes now with ice/water shield (Grace) over the entire roof.
Also, some now spray a thin layer of foam on the inside of all roofs. And I don't see any venting or little venting.
Those that read my Munchkin story - the same home - built by one of the better known builders in the Lakes Region - that home had the roof leak the 2nd year. Insurance claim $8,000 for inside home. The entire roof was ultimately removed and redone. Paid for by the homeowner. House was only 3 years old.