Hi! I'm trying to get IEQ C8.1 by the prescriptive option, but I'm having problems with the calculation of the window areas. Its a residential building and the project contains plenty of balconies and not much windows. Could I consider the areas of the glass doors from the balconies? To calculate these areas, should I use the window head height minus 30 inches or the height of the balcony's sill? And the obstruction of the ceiling of the balcony, should I use the 63-degree angle from the vertical to modify the height? Thanks!

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TODD REED

Energy Program Specialist

PA DMVA

LEEDuser Expert

626 thumbs up

Mon, 02/06/2012 - 15:13

Use the glass from the doors minus the 30 inches. There is nothing that i have read that has this situation that requires the height of the rail to be used instead of the typical height. You get really technical with that if the rail was solid and went the whole way around the balcony and argue that a rail higher than 30 is blocking daylight. If its not within a few feet i would just use the 30 inches. Draw the 63 angle from the end of the balcony above. Reason being is that the angle in the prescriptive method is considering the floor space which has access to the sky dome.

Angela Saggin

LEEDuser Basic Member

13 thumbs up

Tue, 02/07/2012 - 13:06

Thanks a lot, Todd! One more question... should we consider the balcony as a regularly occupied space? It will have a barbecue grill and it's usually used as a space to hang out.. Thanks again!

TODD REED

Energy Program Specialist

PA DMVA

LEEDuser Expert

626 thumbs up

Tue, 02/07/2012 - 13:39

The balcony is an outdoor space so it would not have to be considered in your regularly occupied space calculations.

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Option 2 - Prescriptive

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