Loose tiles and cracked hearths fixed in Hunter's Creek

Where wood flooring may meet the hearth

Wood flooring and trim may run up to the edge of a masonry fireplace's hearth extension under an exception in section R1001.11, provided that material stays 12 inches or more from the inner face of the closest firebox lining.

That distance matters after a flooring job. If new planks were pushed tight against a short extension, the edge of the floor can end up closer to the firebox than the exception allows. We check that measurement whenever a hearth repair meets new flooring.

Hearths in front of factory-built fireplaces follow the listing

A factory-built fireplace plays by different rules. Section R1004.2 says its hearth extension is installed in accordance with the listing of the fireplace, so the manual that came with the unit sets the size and the materials.

One maker's wood-burning model, for example, calls for an extension reaching at least 20 inches in front of the opening and 12 inches beyond each side, and another model can differ. We find the model on its rating plate before measuring, so the repair follows the right document.

• Model found on the rating plate
• Manual read for hearth size and layers
• Repair matched to that document

When a flooring job cut the hearth back

New flooring projects sometimes trim or remove part of a hearth extension to make the new floor fit. The finished room looks tidy, and the extension quietly ends up shorter than the fireplace needs.

We measure the extension against the opening, compare it with the size rule and show you any shortfall. The fix may be extending the hearth into the new floor, with the flooring trimmed back and finished around it by whoever installed it.

• Extension measured against the opening
• Shortfall shown on the estimate
• Hearth extended into the floor
• Flooring trimmed and finished around it

White deposits on a brick hearth

White, powdery deposits on brick or grout are salts carried to the surface by moisture. On a hearth they point to water somewhere, whether a spill that soaked in, a leak above the fireplace or damp rising from below.

We note where the deposits sit and follow the moisture back to its source. Cleaning them off is easy, and keeping them away depends on stopping the water. If the source is a roof or chimney leak, that repair is scheduled separately and the hearth is finished after it.

• A spill that soaked in
• Water from a chimney or roof leak
• Damp rising from below