During a recent evaluation of a newly constructed multifamily building, Jerritt Gluck of Bonded Building and Engineering in Oyster Bay, NY, encountered a classic case of stack effect, or so he thought.

The developer of the $30 million + multifamily construction project looking for LEED certification was in trouble, so they engaged BB&E to perform an ASTM 779-10 test of the building as part of the LEED certification process.

ASTM 779-10 tests are performed on individual apartments with the adjacent apartments open to outdoors. The point of the test is to measure unit inter-connectivity. Blower door tests are performed on all corner apartments plus a random 20 percent of those remaining. If they all pass then it can be assumed the rest of the apartments would also pass. Should any one apartment fail, an additional apartment must be added (per each failure) until at least 90 percent of the tested units pass.

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