At Home: Insulate floors over unheated areas

Q: The room over the garage is cold in the winter and hot in the summer. The attic insulation was checked and OK’d by an insulation company. The roof was replaced last summer, installing ridge vents and removing two turbines.

As the house is reasonably new, 2007, would it profit to spray foam in the garage ceiling to reduce some of the heat leaching into the above-room floor? Also, the attic now is Hades hot. I would appreciate any input from a knowledgeable neutral party.

A: The mistake a lot of contractors make when insulating is they fail to insulate the floors over an unheated area, such as a garage, or the insulation is not properly installed.

The conditioned air inside the room travels in all directions, meaning through the walls, ceilings and floors. The walls and attic area may be insulated, but many times the floors aren’t.

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