Local hearth repair for Fairvilla homes

How thick a masonry hearth has to be

Section R1001.9.1 of the state's residential building code sets the minimum thickness of a masonry fireplace hearth at 4 inches. That is the solid floor under the fire, built of concrete or masonry and carried on noncombustible support.

Thickness matters on a repair because an old hearth is sometimes chipped down, ground flat or patched over the years. When we open a damaged area, we look at what remains under the finish and tell you whether the base still has the depth the code expects, or whether it has to be built back up before anything decorative goes on top.

Measuring the opening decides the rest of the plan

Every size question on a hearth goes back to the fireplace opening, meaning its width, its height and whether its bottom sits at floor height or above it. Those three numbers decide which thickness and which extension size the code expects.

Our specialists take them at the start of the visit and write them on the estimate, so the plan for the hearth is tied to your fireplace instead of a generic drawing.

• Width of the opening across the front
• Height from the firebox floor to the top of the opening
• Height of the firebox floor above the extension
• Depth and width of the existing extension

Closing the gap where the fireplace meets the hearth

Where a factory-built unit meets its hearth extension, one maker's instructions call for the gap between the fireplace frame and the extension to be sealed with a noncombustible material. An open seam there is a path for embers toward the floor structure.

Grout that has fallen out of that joint, or a caulk never meant for the location, turns up often on hearth visits. We clear the seam, reseal it with a suitable noncombustible material and note the work on your invoice.

Hearth items on a home inspection report

Home inspection reports often mention a cracked hearth, loose tiles or an extension that looks short. The note may be brief, and the buyer and seller both need to know what it means.

We visit, measure and write down the condition and the repair options in plain language. A written scope lets both sides discuss a defined job, and it separates hearth repairs from any chimney or firebox items on the same report.

• Condition of the finish and base
• Extension size against the opening
• Repair options in plain language
• Separate lines for chimney or firebox items