Post-blow snow woe (snow loading and depth after deep energy retrofit)
This post asks two questions about snow after insulating , (A) changes in loading and (B) changes in the snow line and how to flash for it.
When it snows, our current (massive) heat loss melts most of it off the roof… and of course we get ice dams. After proper sealing/insulating,. we’ll store all the snow all winter, and in my area you never know when it will rain after snow. The 1920 house has a simple 20×30 hip roof framed with unsupported 2x6s. Should I be worried about possibly overloading the roof when we stop “removing” the snow via melting? I have a St.Eng. doing some other work for me, so I’ll ask him also, but I am very interested in others’ stories/views.
The attached front porch has a gable roof, and the attached back porch has a shed roof. Each roof is within a few inches of a window. Right now, the snow never really piles up all the way to the glass and melts away fairly quickly. After we insulate, this will change. Ideally the building design would have put the window above the snow line of a well-insulated structure, but since I’m retrofitting, how do you flash those windows so your wall insulation stays dry? Please share any links that might help!
Thanks, GBA and readers are awesome!
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