Question 1

How water damages a wall without coping

Accepted Answer

Rain falling directly onto the top of an unprotected wall saturates the masonry and mortar joints. In winter, that water freezes. Water expands by around nine percent when it turns to ice, and it does so inside the small voids and cracks in the mortar and stone or brick. This freeze-thaw action gradually forces the material apart.

Question 2

What a coping stone does

Accepted Answer

A coping stone intercepts rainwater before it can reach the masonry below. The overhanging edges, typically 25mm to 50mm each side of the wall face, throw water clear of the wall rather than letting it sheet down the face. The profile, whether twice weathered or flat with drip grooves, is specifically designed to direct water away from both faces simultaneously.

Question 3

How long the protection lasts

Accepted Answer

Reconstituted stone coping stones, correctly installed, provide effective protection for 30 to 50 years. Natural stone can last significantly longer. The mortar joints between stones will typically need repointing once every ten to fifteen years depending on exposure and the mortar mix used.

How Coping Stones Prevent Water Damage and Extend Wall Life