Masonry Damp Proofing

Rising damp is caused by capillary action (suction) due to fine pores or voids that occur in masonry and the mortar bed. When masonry absorbs water and moisture from the ground, generally due to poor site drainage, the dampness travels upwards into the drier masonry elements causing rising damp and other associated issues.

Why is Rising Damp a problem?

Rising damp can lead to mould growth, which is a type of fungal growth that include rots and mushrooms. Mould is a risk to the dwelling occupants health. Touching or inhaling mould can cause allergic reactions, an asthma attack and is not acceptable for a persons general health.

Rising damp can cause internal damage to a dwelling, including blistering of paintwork and damage to plaster and cement/timber skirting. 

Externally, it can lead to algae growth on brickwork, which is visually unappealing or it can also lead to rising salt if there is natural salts found in soil. Not only will this lead to a salt stain, it can also lead to long-term damage to masonry, including salt attack decay. This leads to crumbling of the surface skin or total de-lamination of a complete skin of brickwork, which would then lead to structural damage.


Our engineers will do a site investigation to discover the reason for the rising damp. We will determine the extent of rising damp and if an existing Damp Proof Course (DPC) exists. We will also determine if there is salt attack.


Once causes are identified, we will determine the best method of action, which may include slot sawing for improved sub-floor ventilation, provision for a mechanical DPC, and impregnation of chemical into brickwork and mortar beds to create a DPC.


The site will be cleaned and any walls with salt attack desalinated. We will ensure all brick/mortar holes are patched and re-grouted. We will provide a basic recommendation on tackling any site drainage issues for clients attention.


We will setup a phone follow up a year from treatment to see if any other damp issues have arisen that need re-addressing or rectification.

We expect that most jobs should take half a day to a day.

damp proofing services