Hearth extension repair done right in Tangelo Park

What sits under the hearth matters as much as the tile

Section R1001.9 has hearths and hearth extensions built of concrete or masonry, resting on noncombustible supports, with reinforcement for their own weight plus every load placed on them. The support keeps a heavy slab from settling and keeps heat away from the structure below.

A finish repair over weak support tends to crack again along the same line. When a crack pattern points to the base, we open enough of the hearth to see it and give you the support repair and the surface repair as two separate prices.

Trim and mantels close to the opening

Hearth work often brings the surround into view. Another exception in section R1001.11 lets combustible mantels or trim sit on a masonry fireplace front only 6 inches or more from the opening, and inside the first 12 inches each inch of distance allows just 1/8 inch of projection.

Mantel rebuilding sits outside a hearth repair, yet we point out trim that sits closer than those numbers so you can decide how to handle it while the room is already under work.

The insulating layer some manuals require

Some factory-built fireplace manuals ask for more than a noncombustible surface. One maker specifies a layer of noncombustible, inorganic material with a stated thermal conductivity under the finish, and shows how to work out the thickness needed from the rating of the material chosen.

That layer is easy to lose in a remodel because it hides under the tile. When we replace the finish on a hearth like this, we confirm what the manual requires underneath and rebuild the layers in order, so the new surface keeps the protection the original design had.

• A noncombustible, inorganic insulating layer
• Thickness worked out from its rating
• The finish laid over it in order

New tile glued over an old cracked hearth

One quick fix seen on hearths is new tile glued straight over old cracked tile. It hides the damage for a while, adds height at the edge and usually cracks along the old lines once the base moves again.

We remove overlays instead of adding another one. With the original surface exposed, we can see what failed and repair it properly, and the finished hearth ends at a sensible height instead of stacking layers.