Your stone chimney, repaired and repointed in Kingswood Manor

The layers behind manufactured stone

On a wood-framed chase, one maker's instructions list the assembly in order, sheathing, two layers of water-resistive barrier, galvanized metal lath, a scratch coat, a mortar setting bed, the stone and the mortar joint. Each layer has a job, and a failure in one shows up in the stone.

When a section of veneer comes loose, we look at every layer behind it before resetting anything. Rebuilding the missing layer along with the stone is what makes the repair last.

• Sheathing on the framing
• Two layers of water-resistive barrier
• Metal lath and scratch coat
• Setting bed, stone and joint

Curing fresh joints on a stone chimney

High-lime mortars harden as they lose water and take up carbon from the air, and drying too fast can leave them chalky and weak. Preservation Brief 2 describes misting repointed areas with a fine spray for a day or two and covering walls with burlap for the first three days, with any plastic tented away from the wall.

What we do depends on the mortar and the day. We protect new joints from hard rain and strong sun and leave you short notes on what to avoid while they cure.

Waiting before cleaning new stone joints

The brief warns that new mortar joints are especially easy to damage because they do not become fully cured for several months, and that thirty days is usually enough before cleaning a freshly repointed wall, depending on weather and exposure.

So a stone chimney that looks dusty after repointing gets a dry brushing at the end of the job and nothing more aggressive until the mortar has hardened. We give you the date when any further cleaning can safely happen.

Moss, algae and dirt on stone

Shaded sides of a stone chimney can hold moisture long enough for moss and algae to grow in the joints and on the stone. The growth holds water against the surface and can darken the stone.

We start with the gentlest cleaning that works, water, a mild detergent and a soft or bristle brush, and avoid pressure and harsh chemicals on the stone and joints. Where growth keeps returning, the findings note the moisture that feeds it.

When a tall chimney needs staging

A tall stone chimney or one on a steep roof may need staging or roof brackets so the crew can work safely and handle heavy stones. That equipment takes time to set and remove.

If your chimney needs it, the estimate shows it as its own item, so you can see what access adds to the job. We set it with care for the roof and the landscaping below.