How many firebricks do I need?
For lining a fireplace firebox: the back wall, both side walls, and the floor. Bricks are laid flat.
Firebricks to buy
78 bricks
Estimated material cost
Firebricks to buy
78 x $$3.00 per firebrick
$234
Typical store prices before tax and delivery. Change any price to match your store.
How to measure
Measure the inside of the firebox: the width across the back, the depth from front to back, and the height from the hearth floor up.
Tips from the field
- Based on standard 9 x 4.5 inch firebrick with 10% extra for cuts.
- Use refractory mortar with very thin joints. Regular mortar breaks down from the heat.
What you'll need
Common questions
What size are firebricks?
Standard firebricks are 9 x 4.5 inches, either 2.5 inches thick or 1.25 inch splits.
What mortar do I use with firebrick?
Refractory mortar with very thin joints. Regular mortar breaks down under fireplace heat.
When should a fireplace be relined?
When bricks are cracked, crumbling, or have gaps you can see into. Have a chimney sweep inspect it first.
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