Waterproofing chimney masonry after repairs in Little Gables

Treatments wear and need renewal

Penetrating repellents last a good while, but they do not last forever. Sunlight, weather and wear gradually reduce their effect, and brick industry guidance treats reapplication as part of their use. When the effect fades, the brick starts to absorb water again.

We do not attach a lifespan to the treatment, because it depends on the product, the masonry and the exposure. The written record notes the product and when it was applied. A later maintenance visit can check whether the brick still sheds water and whether renewal makes sense.

A chimney that runs down the outside wall

A chimney on the outside of the house exposes brick from the ground to above the roof. Waterproofing may cover the full height or only the part above the roof line. Lower courses near the ground often face different problems, such as splash and soil contact.

We look at the whole chimney and explain which parts would benefit most. The lower courses may need soil pulled back or drainage improved rather than a coating. The estimate sets out the height and faces included, so the scope is clear.

What a breathable repellent does

A breathable repellent, applied to sound masonry, changes how the brick handles rain. It is useful protection within its limits, and the list below sets out what it can do.

Those are real benefits on the right chimney. They depend on the repairs done first and on the product suiting the masonry, which is why we check both before recommending treatment.

• Reduces how much water the brick and mortar absorb
• Helps the faces shed rain and dry sooner
• Can slow staining that comes from absorbed water
• Lets water vapor leave the masonry

A top made of a different material

The top of a chimney may be a concrete crown, a stone slab or a metal cover, while the faces below are brick. Each material needs a product suited to it, or none at all. A brick repellent may not be right for the top.

We identify each material before choosing products. The faces get the repellent that suits their brick. The top is handled under its own item, whether that is a crown coating, a repair or simply leaving a sound top alone. The estimate shows which is which.