Cement based renders
are prone to cracking due to thermal movement and as a result of being applied in the wrong weather. In over 37 years of repairing or replacing blown or
we have found the most common area for cracking is on gable walls.
means this large volume of inflexible render cannot absorb slight movements without
thermal movement cracks
appearing over time.
Usually the worst cracked or blown areas are on the top apex as this tends to be hit by more high winds and
than the lower part of the wall which is often shielded to some degree by a neighbouring house. If the gable wall is south west facing then the weather damage is generally worse as the prevailing wind and driven rain comes from that direction.
On older properties there is usually very little if any roof tile overhang. This lack of a soffit or dry verge offers no protection to the gable apex against heavy rain or strong winds and the
is likely to fail before long. Once the rendering is loose or cracked even more water will get behind and when we have a frost this water will freeze,expand and then force more cracks and the cycle of damage continues.
Protecting Render on Gable Walls
Solutions can vary and if the pebble dash or tyrolean is still well adhered to the wall it can be possible to extend the tiles to form a soffit or fit a dry verge system. Less common but effective can be fitting a run of guttering on the side to catch the excess water as it runs off the sides of the wall.
Alternatively of course, you could call Wethertex for a quote on protecting the
in a water resistant wall coating. This will stop any future wind erosion or driven rain damage and thus prevent any cracks or hollow patches appearing in the render.