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The Section 9 space-by-space method does not include residential space types. What should I use?

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Our project has a large process load—75%. Despite our efforts to make an efficient HVAC design, the cost savings are minimal. What can we do to earn this prerequisite and be eligible for LEED certification? Is there any flexibility in how we model the p

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The project is built on a site with existing exterior lighting installed. How should this be accounted for?

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Forum discussion

NC-2009 EAp2:Minimum Energy Performance

Construction Assemblies

Henrique Mendes

Mr.

Green Domus | Desenvolvimento Sustentável

LEEDuser Basic Member

13 thumbs up

September 24, 2012

We also were questioned regarding the construction assemblies used. USGBC says it´s unclear if the construction assemblies in the Proposed model reflect the assemblies in actual design. How should we demonstrate that the construction assemblies used are the same as modeled in the proposed model? Aprreciate any help!

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Marcus Sheffer

LEED Fellow

7group / Energy Opportunities

LEEDuser Expert

4454 thumbs up

Mon, 09/24/2012 - 22:49

You could provide section drawings to show the assemblies that were built or provide a thorough description of all the layers, constructions and the nature of any continuous insulation. Also keep in mind that the U-value of an assembly must be calculated according the ASHRAE 90.1-2007 Appendix A. The tables in this appendix de-rate the insulation values to account for thermal bridging. You cannot determine the whole assembly U-value by doing a point calculation through the insulation. The entire assembly must be included to determine the overall U-value. It is always good practice to cite the specific table from appendix A you are using to determine the assembly U-value.

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