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NC-2009 EAp2:Minimum Energy Performance

Existing Building Fenestration

According to ASHRAE 90.1-2007 Table G3.1.5 (f) for existing building envelopes, the baseline building design shall reflect existing conditions prior to any revisions that are part of the scope of work being evaluated. Does this mean that for an existing fully glazed building (80% of gross above-grade wall area) the baseline building will meet the same portion of fenestration (80%)?

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Marcus Sheffer
LEED Fellow
7group / Energy Opportunities
LEEDuser Expert
4454 thumbs up

Thu, 12/11/2014 - 17:24

If the existing building is 80% then the baseline would be 80% assuming the renovation remained at 80%. If the glazing area was reduced during the renovation then the baseline glazing area would also be reduced.

Thu, 12/11/2014 - 17:52

Thank you Marcus!

Thu, 11/26/2015 - 16:09

When it comes to complete Table 1.4.2A (Shading&Orientation) of the Excel Spreadsheet a message appears stating that Baseline vertical glazing areas limited to 40% of gross above-grade wall area per Table G3.1#5(c). However, our project is 100% major renovation with no additions and a glazing area of 72% which remains the same after the renovation. We can still have a baseline with 72% glazing in that case (according to G3.1#5(f)), cant' we?
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Marcus Sheffer
LEED Fellow
7group / Energy Opportunities
LEEDuser Expert
4454 thumbs up

Mon, 11/30/2015 - 16:38

In my opinion yes you can. G3.1#5f would over-rule G3.1#5c for an existing building. The Table 1.4.2A note is just related to G3.1#5c.

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