Quote:
Originally Posted by stevehull
Now for a practical question. If you truly put adequate insulation on the attic floor AND ventilate the attic well, does this prevent ice damming? Or does it just slow it down?
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In the early 90's, I owned a house in Houghton, MI. The land of 300" snow every winter. The house was a double wide with a low pitch roof (3"?) over a poorly insulated cathedral ceiling. Our first winter had 6" diameter icicles dangling six feet from the eaves.
The next summer, I stripped the shingles, added 2" XPS, laid 2X4's flat on the foam to create an air space, OSB sheathing on top of that with ridge vent, and new shingles. A dozen friends and a big work party got it done in two days.
The following winter showed ZERO ice dams with four feet of snow on the roof.