Rendering external wall


  #1  
Old 03-01-07, 05:10 AM
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Rendering external wall

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.
 
  #2  
Old 03-01-07, 07:12 AM
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What type of render? Cementious or lime based?
 
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Old 03-01-07, 08:36 AM
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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.
 
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Old 03-01-07, 08:51 AM
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The second one is correct, provided the original is a lime based.
 
 

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