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Forum discussion

CS-2009 EAp2:Minimum Energy Performance

Existing Insulated Glass Units

Donald Green

Sr Project Manager / Operations Manager

Progressive AE

LEEDuser Basic Member

25 thumbs up

Project location :

April 29, 2016

We have an existing building whereby some of the existing glass will remain however we cannot determine what the thermal properties of the glass is because there is no documentation and the manufacture is out of business at least 15 yrs ago. How can we make this determination? A second question then is the base case - do we create from the existing building or use as prescribed by ASHRAE 90.1?

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Marcus Sheffer

LEED Fellow

7group / Energy Opportunities

LEEDuser Expert

4454 thumbs up

Fri, 04/29/2016 - 18:09

Use Table A8.2 in 90.1 to provide the estimated performance values. You can use the existing value according to Table G3.1-5 Baseline (f).

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