Non-insulated/unconditioned garage – Is ventilation required?
Are non-insulated, enclosed garage attic spaces required to be ventilated? I’m not sure we meet the IBC’s requirements for unvented attic assemblies if no insulation at all is present.
The garages, located in climate zone 6, will be new construction and for aesthetic/pitch reasons will either be covered with asphalt shingles or TPO roofing (with no rigid insulation below). No insulation will be installed on the roof sheathing, in the attic space, or in the garage walls. The garage bays are planned to have air sealed gyp. board ceilings installed on the underside of shallow roof trusses. Air sealed gyp. board will be installed on the interior walls also. A portion of the garage structures will be used for storage.Lap cement board siding over drainable weather barrier is intended for the exterior cladding over wood sheathing.
If venting is required, what would be the recommended ventilation method for a low slope roof covered in TPO membrane?
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