Loose chimney brick and open joints repaired in Lake Mann Estates

The mortar types named in ASTM C270

ASTM C270 sorts mortar for unit masonry into types, and Technical Note 8B summarizes them. Your estimate names the type we propose for your chimney and explains why it suits the brick and the existing joints.

• Type M, high compressive strength but not very workable
• Type S, all-purpose with higher compressive and flexural bond strength
• Type N, all-purpose with good bonding and workability
• Type O, low strength, used mostly inside and for restoration

When brick and joint work come together

Chimney masonry repair covers the mixed jobs. A few cracked or broken bricks among worn joints, a crack that runs through both, or a section where units and mortar have both failed.

Jobs that are only joint work, or only brick replacement, have their own services with their own scope. When the damage is mixed, we handle it as one repair with one boundary, so the new joints and new units are laid together and match each other.

Stucco, stone and historic chimneys

A chimney finished in stucco, built of stone or laid in historic lime mortar needs different materials and methods from a modern brick chimney. Each has its own service.

We identify what your chimney is built from during the inspection. If it falls outside brick masonry repair, we tell you so and explain which service applies, rather than applying brick methods to a material they were not written for. If a brick chimney has had a coating or partial stucco added over the years, we explain what that means for the repair and whether it should come off.

Finding brick that matches

Brick varies by maker, era and batch, and Technical Note 46 notes that locating matching brick may take considerable effort. Size matters as much as color, since a unit that is a little too long or tall changes every joint around it.

We compare candidates against the existing brick in daylight and tell you how close each one comes. Where sound bricks from the repair area can be cleaned and reused, they often give the closest match of all. The estimate says whether the proposed brick is new, reclaimed or salvaged from the chimney itself.