What problems do man-doors in garages have?

expert EXPERT April 26, 2007

Doors between the house and garage may breach the fire rating or gas tightness if not of a proper type and not properly installed. The doors should be tight fitting and weather-stripped, and most jurisdictions require that a self closer be provided. A 6-inch step up from the garage floor to the door threshold is good practice.

There may be security issues with respect to man doors. They should be at least exterior-type doors, if not fire-rated. They should be fire-rated if the garage/house wall has to be fireproof.

Some municipalities believe that doors directly from garages into homes can allow toxic gases and/or fire into homes. These communities don't allow doors between garages and houses.

The common problems with man doors between garages and houses include

1. door not fire rated or exterior type, as required
2. door not tight fitting and weather-stripped
3. no self closer
4. no 6-inch step up into the house

These problems may be the result of -

• an original construction problem
• modifications by owners
• mechanical damage
• lack of maintenance

The possibility of fire or toxic fumes entering the house is a concern with all of these problems.

Where a fire-rated door is needed, look for a rating plate on the edge of the door or frame.

Test the door operation. Open the door and let go. Does the door close securely by itself? Look for gaps around the door. Does it fit tightly?

Look for a six-inch step up from the garage into the house. Where it is not present, look for evidence of moisture damage around the door threshold on the inside.