20 May '13, 10am

Pondering an Attic Conversion

3. Impact on attic solar heat gain Increase in the amount of heat in a space, including heat transferred from outside (in the form of solar radiation) and heat generated within by people, lights, mechanical systems, and other sources. See heat loss. of roof cladding type and color. The thermal performance of the roofing (its reflectance — the fraction of solar energy the roof cladding rejects — and its emittance — the fraction of absorbed energy the cladding can re-radiate) is important. But take a look at the numbers below for different roofing materials. White shingles are much better than black, but white metal roofing is far better than white shingles at rejecting the sun’s energy and shedding any that it absorbs. Interestingly, while Galvalume has a really high reflectance, the small portion that it absorbs is not easily re-radiated or emiited, so a white metal roof i...

Full article: http://www.greenbuildingadvisor.com/blogs/dept/qa-spotlig...

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