Rock and fieldstone chimney repair in Merrimac
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Stone findings that shape your Merrimac quote
Stone quotes in Merrimac follow this order, from water sources to mortar match.
- Mortar color, sand and joint profile matched
- Roof, landscaping and walkways protected
- Joints tooled to match the existing profile
- Care guidance for the repaired stonework
Before your stone chimney is repaired in Merrimac
How the masons who repoint stone in Merrimac explain the work to neighbors.
The weep screed at the bottom of the stone
On framed walls, a corrosion-resistant weep screed at the base of the veneer gives water behind the stone a way out. The same maker notes that most building codes require one in framed applications and that the barrier laps over its flange.
A screed that is buried, painted over, mortared shut or missing traps water inside the wall. We check the base of every veneer chimney and describe what we find, since loose stones near the bottom of a chase often trace back to this detail.
Full mortar coverage behind each stone
The same instructions require a setting bed with complete coverage of the back of each unit and full contact between mortar, stone and backing. Stones are back-buttered to fill their textured backs, then pressed into a half inch to three quarters of an inch of mortar until it squeezes out around the whole edge.
Stones set with a few dabs of mortar leave voids behind them. Those voids hold water and let stones pop off. When we reset veneer, every stone goes back with full coverage.
Working in hot or dry weather
The same instructions say that in hot or dry weather, the back of each stone should be moistened with a fine spray or wet brush, and a concrete, masonry or scratch coat backing dampened before mortar goes on. Surfaces should look damp but carry no standing water.
Skipping that step lets the stone and backing pull water from the fresh mortar too quickly, weakening the bond. We plan the work and the dampening around the conditions on the day.
Cracks that step through the joints
A crack that steps up through the mortar joints of a stone chimney often follows movement, such as a settling footing, a shifting chimney base or a failing support where the chimney meets the house.
Repointing a moving crack only closes it for a while. We trace the crack, check the base and the chimney's connection to the wall and explain what is moving before recommending a repair. When the movement is serious, the findings say so plainly.
Why we do not pressure wash stone chimneys
High pressure water drives water deep into joints, erodes mortar and can scar softer stone. One manufactured stone maker rules out power washing and sandblasting on its product.
If a stone chimney has been pressure washed in the past, we look for eroded joints and damaged faces during the inspection. Cleaning we do is done by hand with low-pressure rinsing, so the stone and joints keep their surfaces.
Other work in Merrimac
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Quick stonework facts for Merrimac chimneys
Missing your question? Our Merrimac masons will answer it by phone.
Will the new mortar match the old joints?
We match color, texture and joint profile as closely as we can, mostly by matching the sand. New mortar usually looks a little different at first and blends as it weathers. We show you a small sample area before we repoint the whole section.
Should my stone chimney be sealed?
Sometimes, but not by default. One manufactured stone maker says sealers are not necessary on its product and, if used, should be breathable silane or siloxane types, since a sealer can slow moisture leaving the stone. We explain whether a sealer suits your chimney.
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