Loose tiles and cracked hearths fixed in Johnson Village

The metal strip under the front of some fireplaces

Some factory-built fireplaces ship with an ember protector, a strip of galvanized sheet metal placed between the hearth extension and the bottom front edge of the unit. One maker's manual says it goes in before the fireplace is secured, to stop glowing embers from falling through that joint.

When a hearth is replaced, that strip can be bent, cut short or left out entirely. We check for it during removal and replace it with the maker's part or the specified sheet metal before the new finish closes the joint.

Adding a border to reach the required size

A hearth extension that falls a few inches short can sometimes be brought up to size with a border of matching or contrasting material, built on the same kind of noncombustible support as the rest of the extension.

The border has to be part of the hearth, set in place and supported, and thick enough for the rule that applies to your fireplace. A strip of tile glued onto the wood floor is decoration only. We draw the border on the estimate with its dimensions so you can picture it before approving.

Reinforcement in a rebuilt hearth extension

Section R1001.9 requires hearths and extensions to be reinforced to carry their own weight and all imposed loads. On a rebuild, that reinforcement is designed into the new slab from the start.

We describe the base construction on the estimate, including its support and reinforcement, so you know the new extension is built as a structural part of the fireplace and more than a decorative pad.

• Noncombustible support under the slab
• Reinforcement for its own weight
• Capacity for the loads it will carry

Checking the thickness of an existing hearth

Thickness is hard to see once a hearth is finished. A chipped edge, a removed tile or a small test opening shows what lies below the surface and how deep the solid material goes.

We check depth where damage has already opened the surface before cutting anything new. The measurement goes into the estimate beside the code minimum for your fireplace, so the recommendation rests on what is actually there.

• Depth checked at existing damage
• Compared with the code minimum
• Result written into the estimate