Water tight external rendering options

Question

Water ingress only when sustained heavy rain driving into south facing wall. Believe it's getting through cracks in render and running down external surface of wall where it continues down past lintel support beam due to extension roof flashing installed short of wall and going through gap.

What are my best options to stop this please ?

Rui · Answer

I believe using a resign based render would be Beneficial to your water ingress issues, it uses a fiberglass mesh underneath the top coat to reduce the chance of cracking. It's price is comparable to normal cement render and can be tinted to suit your colour choice.

Rui gollop
Your friendly neighborhood builder
ADD Building Services

Michael · Answer

Were cavity trays installed when the extension was built? If not this could be the issue.

Andy · Answer

Krend silicone render with a choice of coloured finishes

Jason · Answer

No easy way to answer this question without inspection of problem, would just be guesswork.

Justin · Answer

I would look at the flashing and guttering first ,water is not supposed to run down your walls

Adam · Answer

Unless the cracks are large in the render is mostly likely due to poor weather detailing at intersections of various elements.

Adam · Answer

The main causes are as follows: Building faults – damaged or deteriorating mortar can lead to water ingress through the render. Any cracks in the brickwork or substrate will also allow water to get in. This can occur for a number of reasons including more serious structural issues.

Water tight external rendering options

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