29 Dec '15, 1pm

A Socioeconomic Context for Ice Dams

A Socioeconomic Context for Ice Dams

Of the three forms of heat transfer — conduction Movement of heat through a material as kinetic energy is transferred from molecule to molecule; the handle of an iron skillet on the stove gets hot due to heat conduction. R-value is a measure of resistance to conductive heat flow. , convection, and radiation — the biggest culprit in the formation of ice dams is convection, or air-transported heat. Warm air rises from the heated spaces of our homes, comes into contact with the underside of the roof sheathing Material, usually plywood or oriented strand board (OSB), but sometimes wooden boards, installed on the exterior of wall studs, rafters, or roof trusses; siding or roofing installed on the sheathing—sometimes over strapping to create a rainscreen. , and melts the snow on top of the roof sheathing into water. The water runs down to the eaves where it freezes solid, causin...

Full article: http://www.greenbuildingadvisor.com/blogs/dept/guest-blog...

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