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What building elements get included in this calculation and what can be excluded?

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NC-2009 MRc1.1:Building Reuse—Maintain Existing Walls, Floors and Roof

Historic Building Restoration

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Glen Boldt
GBWorks
LEEDuser Basic Member
8 thumbs up

The building is being restored to an "historic condition." Do unfortunate additions (like CMU block in sealed up former window areas) subsequent to the "historic condition" need to be included in the calculation as existing envelope elements, or can we consider the "historic condition" the existing?

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April Brown
Sustainable Building Consultant
Green Bridge Consulting
LEEDuser Expert
28 thumbs up

Sat, 11/03/2012 - 21:25

This is kind of tricky and I do not have specific experience with it - it may be worth a LEED interpretation. My two cents, however, are 1. the window area is excluded from the structural calculation for building reuse, so I could see you making a case for excluding the area in your situation, especially if you are putting windows back in the area; 2. the CMU block in the window area are not structural, therefore your structural wall itself is being reused, despite the window area. MRc1.1 is specific to structural components, while MRc1.2 is for the interior nonstructural elements. Be sure to look in the documentation toolkit for sample calculations, which may be helpful for wrapping your head around the requirements.

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