Fireplace Repair
Hearth repair done properly in Black Hammock
Our experts measure the hearth extension and check its support before any material is ordered.
What holds the hearth up
A masonry hearth extension needs support that will not burn and will not sag. The Florida residential code wants noncombustible supports under it and enough reinforcement for its own weight and any imposed loads. Brick industry guidance describes a reinforced slab where the hearth cantilevers from the fireplace wall to the floor framing, or a base filled solid with masonry.
When cracks or movement suggest the support has changed, we look at how the hearth is carried wherever the structure can be seen. If the base needs work, that becomes the first line of the repair, ahead of any finish. Finding the support problem first is what keeps the new finish from cracking along the old lines.
Heat and the hearth slab
The hearth sits right in front of the fire, and it heats and cools every time the fireplace is used. Brick industry guidance notes that the reinforcement in a hearth slab also helps it resist the stresses that high temperatures put on it. The front of the firebox is often the hottest part of the hearth, and cracks there can have a different cause from cracks further out.
A hearth that cracks close to the opening, especially one built without that reinforcement or on a thin base, may be reacting to heat as well as load. We look at where the cracks sit relative to the firebox, and we plan the repair so the new work can take the same heat without the same failure.
Why a new finish never goes over a failing hearth
Laying new tile over an old hearth can look like a quick fix, and on a sound, flat base it can sometimes work. Laid over a base that is cracking or moving, the new finish inherits the same problem and usually cracks along the same lines. The extra layer also adds weight to a base that may already be struggling.
It also raises the hearth and changes the edges, which affects the floor transition and, on a masonry fireplace, the thickness allowances. We check the old hearth first and recommend an overlay only when the base is sound and the new height works everywhere it meets.
A hearth used as a shelf
A fireplace that is rarely lit often becomes a display shelf, with planters, stone pieces or heavy decor on the hearth. The hearth is built to carry weight, but concentrated loads, dropped items and water from plant pots all leave marks. Metal planters and pot saucers can also leave rust marks that sink into porous stone.
If a crack appeared after something heavy was placed or dropped, tell us, since it points to impact and helps with the diagnosis. Water rings and mineral stains from plants can often be cleaned, and we check that no water has worked under loose tiles.
