Define what the garage should become

Keep it outside the conditioned enclosure or bring it in. Every boundary detail follows.

Trace the house-garage separation

Map shared walls, ceilings, doors, penetrations, and any room above. Preserve required separation while improving air control.

Inspect the room above

A bedroom or bonus room over the garage makes floor-edge continuity, ducts, plumbing, and concealed bypasses especially important.

Address combustion and ventilation

Identify fuel-burning equipment, vehicle exhaust, ventilation paths, and required clearances before changing enclosure behavior.

Manage slab and door moisture

Check water entry, slab moisture, weather seals, and the large overhead door. Insulation cannot correct a wet slab or open perimeter.

Choose an assembly, then a product

Set the control layers, target surfaces, access, protection, and inspection sequence before matching exact product documents.

Verify before covering the work

Record product identity, conditions, continuity, thickness checks, penetrations, repairs, and required protection while visible.

Stop when the boundary is unresolved

Do not spray around an unclear separation, active moisture, combustion hazard, or inaccessible service. Resolve the system first.