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NC-v4 EAp2:Minimum energy performance

Air Barrier for Existing Building

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Martin Meehan
Principal
Meehan Associates
LEEDuser Basic Member
14 thumbs up

Hi all, This query follows on a similar theme to the previous topic. We are working on an existing building that is intending to improve the envelop performance by internally adding insulation to all external walls. There will be no other alterations to the envelope. 1) Given that we are altering and thermally improving the existing external wall - do we have to also install an air barrier per 5.4.3.1.2? 2) Are the other envelope elements that remain unchanged such as the floor/roof exempt from air barrier requirements? Thanks!

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

Tue, 04/11/2017 - 13:29

I think you do what is accessible during construction. So implement everything you can. You would not be required to significantly alter the wall assembly to install any component that you cannot physically install without a major disassembly of the walls.

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