rising damp repair

Question

i have rising damp in a party wall. we have stripped off the skirting board and wet plaster to reveal wet bricks. 
It looks like it has had some repair work previously as i can see the drill holes but, its not working now. 
how do i get rid of this and repair it please?

Luke · Accepted Answer

Drill 2 holes per brick, inside and out, as near floor level as you can (inside floor level, not outside). Apply dry zone with dry zone gun. Mortar mix with added damp proofer 1m high all internal walls. Leave 24 hours and then plaster over the top of the mortar mix. 

The drilled holes want to be roughly half way through the brick.

Andrew · Answer

You will maybe have to put a new damp course membrane as you should not get damp on an internal party wall

John · Answer

Hi, unfortunately you will never get rid of the damp penetration due to its location.
It sounds like it has already been drilled & injected which rarely actually works.
The only practical way to prevent the damp ingress is to 2 coat tank (render) the wall with a good quality additive Sika for example.

Kevin · Answer

Hi I’m Kevin 
Look up a company that does this sort of work all the time. That way you will get a guarantee by the sound of it and has been done before but needs to be done again by professional company that do this all the time. Thanks

Krzysztof · Answer

If that is Rising Damp that means your cavity wall is bridged or damaged on the DPC level. If you see drill holes that means you had silicone injections in past. If drill holes are spread too far silicon injections won't work. Do you know when injections have been done?

Jagvinder · Answer

Leave the wall bare bricks and let it dry up any moisture and get DPC plaster and plaster it as undercoat then finish it with multifinish plaster.

Plastering Skimming and Building Service's

Andy · Answer

There could be several reasons why…raising damp is the obvious…could also be a damp issue coming from outside walls depending on weather you have a cavity wall or solid 9” exterior walls

Ahmad · Answer

Take out one course of bricks from the bottom and put concrete beam with plastic on top of it I think this may work

Bradley · Answer

Either drill holes and fill with ct1 it isn't as affective as using resins to reseal the damp course if the building is against the higher level the rain will get to the lowest points

Daniel · Answer

Take the bricks out and replace them 
Add a dpm whilst you do this . 
The only ,cheaper alternative -is to dot and dab the wall with insulation backed board - ie hide the damp.. This is common where the budget does not extend to do major brickwork in tradition built homes ,,and the customer requires a fast warm solution . 
For local ,smaller  patch repairs ,, strip the wall back exposing the full damaged patch ,, then paint the wall with acrylic roof paint -not bitumen ,,,wait for this paint to dry and then bond and skim the patch ,, for may old building this is the only option -because the walls are seldom square enough to accommodate a full dry lined finish - so we ‘make good’ using this last option .  Black jack roofing brand offers a waterproof tanking -stopping the water from being drawn through the brick by evaporation 
This will keep the damp back in the brick ,,there is no other solution except to demolish and -rebuild ,then add a modern damp proof membrane .

rising damp repair

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