Hi all,
We have a roof above an unconditioned floor with the mechanical equipment and we dont know what to do about the SS c 7.2. We have some questions:
1_ Some of the elements of the roof are some decorative weathering steel chimneys with sloped shape, shall we count only the area from the top view or which one? We think that it is the best option, count the projected area but we dont know what to do with the hole of the chimney, shall we count the SRI of the mechanical floor below??
2_ The roof above the unconditioned space is divided in different areas, one with the chimneys, another with white concrete slab and another one with a metal grating. Does the metal grating counts as roof? its permeability is above 80% shall we count with the SRI of the mechanical floor below the metal grating to calculate this credit? and about the shading provided by the metal grating??
Thanks a lot!!!
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Susann Geithner
PrincipalEmerald Built Environments
1297 thumbs up
November 9, 2011 - 6:20 pm
For the slope roof, check the checklist section in regards to how to account for sloped roofs.
The chimney I would suggest to count as mechanical equipment as a whole so including the masonry/metal. It's for heating of the space.
In regards to unconditioned spaces, in the past you would only count the conditioned space in this credit, but judging from the more recent addendum, which defines the roof area better, it is questionable if this still holds up. http://www.leeduser.com/credit/NC-2009/SSc7.2#comment-16498