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Our proposed design has insulation R-values that are below those prescribed by ASHRAE 90.1-2010. Can we still meet the prerequisite?

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NC-v4 EAp2:Minimum energy performance

insulation thickness versus energy modeling

We are running into a situation where the insulation is slightly under the R38 (R34.8) that is required per ASHRAE 90.1 yet the energy model shows we are over 10% energy efficient. Will this still meet the LEED v4 requirement?

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

Mon, 06/27/2016 - 14:00

Yes. The insulation value is a prescriptive measure so it is available for trade off.

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