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Damp Proofing

House damp proofed 02 but why is damp rising from the inside by the front door.

4 Answers from MyBuilder Damp Proofing Specialists

Vague description but it could be a compromised DPC (Damp Proof Course) in the brickwork, this should be 150mm above ground level (approx 2 courses of bricks).


Answered 8th Mar 2011

Outside there could have been a front door step built or a rendered plynth without waterproofer and this could be bridging the DPC or possibly the front door may have a problem with the fixings and weep holes if its a upvc frame.


Answered 12th Mar 2011

It could be a solid wall with no cavity check the pointing


Answered 24th Mar 2011

They may have simply missed this section out, or it could be a failure or a solid section, but it should have been tanked anyway?

unless the interior walls were properly tanked during the installation, ie,they were just injected and re plastered with a lime light renovating coat, expect a systematic faluire through the entire work. Unfortunitly, without a certificate proving your contractor is using BBA approved chemicals and installing a system that is manufacturer backed who they are registered with and approved to use, you'll have been done.

There are so many small companies doing this work now and the ill informed are non the wiser as to what actually needs to be done to prevent rising and penetrating damp permenantly, as apposed to damp free until the cheque clears.

If it were us who'd installed it, you would have a direct contact on your certificate, do you have this? A surveyor for the product company would attend, diagnose a failure of product or if our installation was wrongly carried out. And my insurance would pay for a seperate team not connected to us to re install a brand new DPC and repair any subsequent damage caused.

I would advise an indipendant survey of the area so as to conclude what's happened with further moisture readings on the rest of the install, then try to gain some insight as to what was originally done by your contractor in detail and seek a solution.

As a rule of thumb, a genuine 30 yr guaranteed insurance backed BBA approved installation will normally be 2 to 3 times the price of a simple injection hack off and re plaster ie, the ones that fail. 4 average walls with the above is around the 2k plus mark

Let us know how you get on, either way.


Answered 14th May 2011

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