DIY Doctor

Main navigation

Repointing below damp course

Postby Tim Rogers » Sun Oct 21, 2007 10:02 am

What do I need to add to the mortar mix for repointing below the damp course? I've got some Wickes Waterproofer & Retarder for rendering, but am not sure if this is suitable. Any advice greatly appreciated.
Tim Rogers
Rank: Labourer
Progress to next rank:
Posts: 1
Joined: Sun Oct 21, 2007 9:40 am


Simply Build It

Postby tradeaway » Sun Oct 21, 2007 5:51 pm

3 sand to 1 cement, use waterproofer and wet the wall before pointing. allow the wall to dry off a little first. on warm sunny days more than one wetting may be needed.

cement loves water, and simply loathes dry crumbly substrates.
Rank: Apprentice
Progress to next rank:
Posts: 7
Joined: Tue Oct 16, 2007 9:16 pm

Postby LCL » Fri Oct 26, 2007 4:18 pm


How old is your house and is the original mortar a lime based mortar?

If your house is reasonably modern (post war say) tradeaway is correct.

If it is an older property you should be wary about using waterproof additives and even cement sometimes as this could increase dampness inside the house (particularly if it is an old solid wall). Dampness in old buildings needs to be managed and sometimes carrying out works with the best of intentions can aggrevate the situation.


Rank: Ganger
Progress to next rank:
Posts: 139
Joined: Tue Sep 11, 2007 2:40 pm

Postby TheDoctor5 » Thu Jan 22, 2009 10:24 am

Last year 64% of the questions asked in our forum were answered within our DIY project pages at The project pages are now separated alphabetically and your answers are accompanied by diagrams and the ability to see, and buy, the tools and/or required to complete your project. Use our search box to look for your answer and save a great deal of time and money!
Posts: 1381
Joined: Tue Jan 20, 2009 9:17 am

Display posts from previous
Sort by
Order by

  • DIY How to Project Guides
  • DIY how to tutorial projects and guides - Did you know we have a DIY Projects section? Well, if no, then we certainly do! Within this area of our site have literally hundreds of how-to guides and tutorials that cover a huge range of home improvement tasks. Each page also comes with pictures and a video to make completing those jobs even easier!

  • Related Topics