Hello,

Newbie to the forum here. I'm looking for some advice regarding insulation below a gas fireplace.

We recently remove a large brick hearth. As you can see there is no insulation under the fireplace . The cold air comes in unabated and we would like fix that.

The three areas under the fireplace that need attention are all made entirely of wood (2x on 3 sides and 3/4" plywood on the top).

My understanding is of course wood has a much lower combustible temperature than either fiberglass or rock wool insulation. Is there any reason that I can't simply insulate the three cavities with product (non-paper faced) from the local home improvement store?

The town home was built in 1985. I'm unable to find any brand info/model number/specs pertaining to the fireplace.

Thank you for your thoughts and advice.