Garages in Southeast Michigan Homes: What Inspectors Check Before Freeze Heave and Fumes Become a Problem

Garages are often the most overlooked part of a home inspection — buyers walk through, see a concrete slab and some shelving, and move on. But in Southeast Michigan, where freeze-thaw cycles, road salt, and attached-garage fumes all come into play, garages quietly accumulate problems that matter for safety, structure, and resale value. Here's what a thorough inspection actually looks at.

Structural Movement from Freeze-Thaw Cycles

Garage slabs and foundations in Metro Detroit go through repeated freezing and thawing every winter, and that movement adds up over the years. Inspectors look for:

• Cracking or heaving in the slab, especially near the overhead door track
• Separation between the garage slab and the house foundation
• Gaps where the slab meets the walls, which can let water and pests inside
• Settling that causes the overhead door to bind or not seal properly

Some slab cracking is normal and cosmetic. The concern is movement that affects drainage, door operation, or structural support for an attached garage's shared wall.

Fire Separation on Attached Garages

Attached garages need a proper fire-rated separation between the garage and living space — this includes the shared wall, the ceiling if there's living space above, and the door connecting the garage to the house. Inspectors check for:

• Gaps, damage, or missing drywall on the shared wall or ceiling
• Self-closing hardware on the garage entry door, where applicable
• Penetrations around pipes, wires, or ductwork that break the fire barrier

This separation exists to slow the spread of fire and limit carbon monoxide and exhaust fumes from migrating into the home — a real concern with cars, generators, and gas-powered equipment stored in attached garages.

Overhead Doors and Safety Sensors

Garage door openers manufactured after the mid-1990s are required to have auto-reverse safety sensors, but age and DIY repairs mean not every system works as intended. Inspectors test:

• Auto-reverse function when the door contacts an object
• Photo-eye sensor alignment near the floor
• Spring and cable condition, since broken springs are a common and dangerous failure point
• General door balance and smooth operation on the track

Drainage and Water Intrusion

Garages are notorious for water problems that homeowners don't notice until spring. Melting snow, road salt brine, and rain all run toward the garage floor, and poor grading or a missing floor drain can send that water toward the house foundation instead of away from it. Inspectors look at floor slope, the condition of any floor drain, and whether water is pooling near the entry door threshold.

Electrical and Ventilation

Many Metro Detroit garages have been updated over the years with extra outlets, lighting, or 240-volt circuits for workshops and EV chargers. Inspectors check that this wiring was done safely, that GFCI protection is present where required, and that there's adequate ventilation if the garage is used for anything beyond parking.

Why It Matters at Closing

Garage issues rarely derail a sale, but they're frequently used in repair negotiations — and safety items like fire separation or door sensors are worth addressing regardless of a transaction. A full inspection from Pre Closing Inspection covers the garage with the same attention as the rest of the home, so nothing gets missed in the walkthrough.

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