Insulation around old brick fireplace

Sealing the Old Fireplace

Strip of fiberglass insulation forms a smoke and gas tight seal between a fireplace insert and the surrounding masonry. Insulation should be replaced every time an insert is removed for cleaning. Peel off backing and apply to the back of fireplace insert flange to seal space between flange and masonry surface.

Meeco's Red Devil 1105 Fireplace Insert Insulation

Exposing Brick

BREAKING: My Kitchen has a Fireplace!

framing - Frame drywall around brick fireplace - Home Improvement Stack Exchange

Before & After: Family Room Remodel and White Washed Fireplace

Fireplace Projects

Simple Ways to Remove a Brick Fireplace (with Pictures) - wikiHow

Solid wall (approx 220mm) dry lining and insulation