Unusually Tight Construction
UNUSUALLY TIGHT CONSTRUCTION, as defined in the Mechanical Code,
is construction where:
1. Walls and ceilings exposed to the outside atmosphere have a
continuous water vapor retarder with a rating of one penn or less
with any openings gasketed or sealed, and
2. Weatherstripping on operable windows and doors, and
3. Caulking or sealants are applied to areas such as joints around
window and door frames, between sole plates and floors, between
wall-ceiling joints, between wall panels and at penetrations for
plumbing, electrical and gas lines and at other openings.
This term is important in live/work because in buildings of unusually
tight construction, outside combustion air must be provided for
gas appliances, an expensive proposition in many cases. Typically
an existing building being remodeled for live/work will not have
this problem. However, if it is a concrete building, is getting
new doors and windows, and is being sealed on the outside, it
is possible. Check with your mechanical engineer as the project
proceeds.
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