Bricks, Masonry, Asphalt and Concrete - Rendering external wall

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brooks
03-01-07, 06:10 AM
The render on an external wall of my cottage is letting rainwater in and mould is appearing on the inside. I have two quotes to re-render. One builder wants to add waterproofing to the wall; the other says it would be better not to as it would hold in water that is already in the wall. Which is the better option?

Thank you.

Tscarborough
03-01-07, 08:12 AM
What type of render? Cementious or lime based?
brooks
03-01-07, 09:36 AM
The first builder, who wants to waterproof, aims to use a cement render but the second thought the original render had lime in it so he was going use same.

Tscarborough
03-01-07, 09:51 AM
The second one is correct, provided the original is a lime based.