Masonry Restoration in the Seattle Area, WA.

Brick laid before roughly the mid twentieth century is softer and more absorbent than brick made today, and it was bedded in lime-rich mortar that was softer still. That assembly works as a system: it takes on water, moves with it, and releases it through joints that are deliberately the weakest part. Repairing it with modern materials breaks the system. A portland-rich mortar is harder than the surrounding brick, so the movement that the joint used to absorb goes into the units instead, and they crack and spall along the line of the repair.

The same logic rules out most of what gets sold as masonry renewal on an older house. Sealers and water-repellent coatings trap moisture inside units that need to breathe, and the face comes off the following winter. Pressure washing takes the fired skin off soft brick and leaves it permanently absorbent. Hard sand-cement render over old brickwork holds water against it indefinitely. In each case the house looked better for a season and is materially worse a decade on.

Restoration work means matching before it means repairing: mortar matched to the original in strength and colour, salvaged or quarry-matched units, joint profiles reproduced as they were, and cleaning done at the gentlest method that works. Chimneyz restores older brick and stone across Greater Seattle, and where a previous hard repair is what is now damaging the wall we will say so, because that repair usually has to come out before anything else is worth doing.