3.1501.2 Garages—Sealing Penetrations

Attached Garages
Garage Openings
Desired Outcome: 
Openings sealed to prevent air transfer between garages and conditioned spaces
For supporting material, see Referenced Standards.

All lighting fixtures, wiring, plumbing, venting, ducting, and gas piping penetrations will be sealed

Prevent air leakage and pollutant entry


All ductwork in attached garage will be sealed in accordance with the duct sealing specifications

Where duct system serves any other conditioned or living space, all supply and return openings (including intentional openings designed to heat or cool the garage space) must be disconnected, capped with sheet metal, and completely sealed

Prevent air leakage and pollutant entry, including under conditions when duct fans are not operating


All cracks in walls, ceilings, or floors that separate conditioned space from garage will be sealed, including cracks between mud sill, rim joists, subfloors, and bottom of gypsum board

Prevent air leakage and pollutant entry

Garage to conditioned space door

Weather stripping, door sweep, or threshold will be installed to stop air leakage in accordance with SWS 3.1201.8 Repair, Maintenance, and Weatherstripping of Doors

Prevent air leakage and pollutant entry


Broken glass panes in doors will be replaced, pointed, and glazed, where needed

Where glazing is permitted by code, verify that replacement glass meets the intended fire resistance of the assembly penetrated and is safety glazing as mandated by CPSC CPSC Consumer Product Safety Commission 16 CFR 1201

Glazing located in wall connecting garage to conditioned space with fire-resistance ratings may be prohibited; confirm that existing glazing application is consistent with all applicable building codes

Prevent air leakage and pollutant entry

Preserve design integrity of fire-resistance-rated assemblies between garage and conditioned spaces

Carbon monoxide ( CO CO Carbon monoxide ) detector

Carbon monoxide alarms or detection systems that comply with applicable codes, laws, and ordinances will be tested and confirmed to be operational upon completion of any enclosure work

Protect occupants from CO CO Carbon monoxide exposure from attached garage

Building operations staff/occupant education

Occupant and building operations staff will be educated on need to keep door from garage to conditioned space closed and need to minimize the time any gas engine appliances or grills are operated in the garage, even if the main door is left open

Reduce risk of CO CO Carbon monoxide poisoning inside of garage and adjacent rooms