Chimney brick replacement and spalling repair in Carrollwood

Matching replacement bricks to the chimney

A replacement brick should match the existing brick in size, color and texture, and also in how it behaves. The Brick Industry Association notes that locating a matching brick can take considerable effort, and recommends judging the match against the existing work with a sample.

A close color match that absorbs water very differently, or a brick of the wrong size that forces thick joints, can create new problems. We weigh physical suitability alongside appearance.

Before ordering, we describe the options we can find and how close each is likely to look, so the choice is made with you.

After the new bricks are in

Once the bricks are replaced and the water entry has been dealt with, give the chimney time. The Brick Industry Association advises waiting several months after repairs before deciding whether a water repellent is needed, because the repairs often solve the moisture problem on their own.

Keep the estimate and the completion summary, including the brick and mortar used, for future reference. Watch for new changes rather than assuming every mark on older brick is the same defect.

If loose material or dampness returns, call for another look before anyone adds a patch.

Testing the existing mortar

Matching the original mortar is easier when you know what it is. The Brick Industry Association notes that a laboratory can analyze a sample of the original mortar to estimate what it contains, in what proportions and how strong it is, generally following the methods of ASTM C1324.

Most chimney brick repairs do not need a laboratory report, but on older or unusual masonry it can be worth the time. We explain when testing would add value and when a careful comparison on site is enough.

How repointing mortar is prepared

Mortar for the joints around replaced bricks is mixed differently from ordinary mortar. BIA describes prehydrating it, which means mixing the dry ingredients, adding just enough water for a damp mix that holds its shape, and letting it rest for an hour to an hour and a half before the rest of the water goes in.

Prehydration reduces shrinkage, which helps the new joints stay tight against the brick. It is one of several small steps that separate a lasting repair from a quick patch.