How to deal with lateral damp problems?

rising damp - diagnosing damp - Waterproof Junction

The most common form of damp is lateral damp and the most common causes of lateral damp are:

  • Flower boxes
  • Stepped floor levels(internal)
  • Raised external ground levels
  • Raised paving

If not properly diagnosed lateral damp can be mistaken for rising damp – the appearance seems the same i.e., blistering of paintwork, appearance of efflorescent salts, degeneration of plaster etc.

It is of utmost importance that a proper inspection is conducted to ascertain the cause of the problem and not just accept that it is rising damp

Waterproof Junction does offer this service to customers using the latest flir infra red thermal camera and moisture meters.  We supply customers with a report and scope of work to rectify problems. We do not undertake the repair in any way.  We have accredited damp proofing specialists for your area.

Lateral damp normally occurs when moisture enters the brickwork above the DPC. Most boundary walls suffer from lateral damp where the ground level of the adjoining property is higher than that of the adjoining property. These problems are also experienced in houses with (split levels). Builders often fail to continue with DPC over the concrete slab above and below, this encourages movement of moisture into the brickwork and eventually the plaster. Paving is also often the cause of damp. Paving placed next to property walls above the installed DPC will eventually enter the plaster and effect the substrate above.

Be sure to always inspect ground levels when inspecting damp, there is always a possibility that the moisture is entering above the level of the installed DPC.  The term used for treating lateral damp is refferred to as “Tanking” the effected walls with cementitious slurry.


DAMPZERO HYDRASEAL SLURRY -Supplied in 20kg containers. Simply add +- 6 litres of water.

A liter of DAMPZERO BONDCRETE can be added to the mixture. The HYDRASEAL SLURRY already have bonding polymers in the mixture so the adding of the BONCRETE can be seen as an extra precaution. DAMPZERO HYDRASEAL SLURRY should be applied using a block brush. The slurry needs to be applied in 2 coats allowing 6-8 hours between coats ensuring to apply the 2nd coat in the opposite direction to the 1st coat. The plastering of the wall should be undertaken before the 2nd coat of slurry cures. As soon as the 2nd coat becomes (TACKY) 1-2 hours plastering can begin.

DAMPZERO PLASTERGUARD – This is supplied in 5KG containers.

A standard mixture plaster (1 cement, 3 plaster sand) requires 3x scoops of PLASTERGUARD in the dry mixture of sand and cement, water is then added to complete the mixture.

The adding of the PLASTERGAURD is to prevent any further growth of salts which may have been ingressed in the brickwork.


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