Insulation was put above our gas fireplace. That should minimize heat creeping straight up, and instead focus the heat out into the family room.
Insulating around Direct Vent Fireplace
Fireplace Cover, Fireplace Insulation Draft Blocker, Fireproof Fireplace Blanket for Heat Loss, Fireplace Flue Blocker, Fireplace Cold Air Blocker(39 W x 32 H) : Home & Kitchen
Walls Behind Fireplaces Building America Solution Center
All About Fireplace Efficiency
Gas fireplace draft ?
Why Repair A Crack In A Fireplace? What Are The Dangers?
How important is the insulation AROUND the fireplace insert? (Especially FPX 33, Lopi Declaration)
The Importance of Preparing Your Fireplace for Winter - Men's Journal
Choice of insulation behind electric fireplace
how I created an insulated fireplace cover with pallet wood!
How Do Chimneys Work? How a Chimney Works Explained - Rockford Chimney
Insulation behind gas fireplace. Not sure if safe. : r/HomeImprovement