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<body class='hmmessage'><div dir='ltr'><em>Any help regarding the reuse of an existing building LEED simulation would be helpful. We are working on an existing building that was a warehouse and is now an office building. The existing shell was un-insulated concrete block walls and an un-insulated metal roof with metal joists. Using the ASHRAE 90.1 guidelines for envelope allows the use of existing envelope, but in the climate zone at-hand our proposed envelope alone represents a 30% energy cost savings. Our question is whether there is an exception or limitation to using existing the envelope if a building use is changed, ours is now an office.</em><br><BR>Thanks,<BR> <BR>Ken<BR> </div></body>
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