Ask an expert

Get free help from our community of tradespeople

Injection damp proofing

Posted by Richard Woods, on
We have a case of requiring to extend the damp proof up about 9 inches after a neighbour lifted the height of their path (happened before we moved in) its affecting the garage and downstairs cloak room, any suggestions we would prefer not to request the neighbours dig up their path having just moved in. The garage has a bedroom and shower room above it which is an extension and the RSJ's supporting this stand on additional block columns. Decorating isnt an issue as its a garage and the cloak room looks like a swedish sauna which isnt a style we're going for and so will be redone (we guess the damp issue is why they added the boarding)
Richard Newbery

Richard Newbery

As Chris has just stated best and most reliable method is to restore grond level below DPC on the neighbours side otherwise you may be chasing this problem continually ,damp problems have a habit of re surfacing!
Chris Plastow

Chris Plastow

One must inject the wall 150mm above the new ground level, waterproof render to at least 300mm above that but 1.2m would be recommended. Your floor may also be affected in time, this cannot be avoided without removing part of the floor! Best to get the ground level back to normal if you can.

What would you like to do now?

Find more questions Create my Job

Homeowner stories

Homeowner stories - Nick

Nick shares his story of finding local tradespeople in his new area.


Get our app for homeowners

  • Send messages and get notifications from tradespeople
  • Add photos to get more accurate quotes
  • View tradespeople’s profiles