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SHGC of Skylight without Curbs

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Maya Karkour
EcoConsulting
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Jean Marais
b.i.g. Bechtold DesignBuilder Expert
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Fri, 04/16/2010 - 08:19

SHGC 0.19? It's not an error. I've had this problem before. Insidently, have you managed to find a glass type with a U-value 6.81? They also, as far as I can tell, don't exist. Insidently, have you noticed that TABLE A.8.1B 's lowest listed SHGC for skylights is 0.27? To me this basically declares (and maybe rightly so) that you shouldn't install skylights in these climes or if you do the technology must be (theroretically) efficient enough. The simulation method is not bound to these restrictions.

Sat, 04/17/2010 - 20:06

As Jean says, the standard is trying to discourage large skylights in these climate zones. For smaller skylights up to 0.39 is allowed. Also remember that SHGC includes any external shading installed.

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