Damp Proof Injection

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Damp proof injection

Damp proof injection is a fast, cost-efficient and highly effective form of rising damp treatment. The process involves injecting a silicone-based damp proof cream into drilled holes in the property. The solution then penetrates the masonry and creates a water repellent barrier. One of the key benefits of this type of damp proofing is that damp injection can be used in walls that have suffered from severe water saturation.

Continue reading to find out more about damp injection, or to speak to our damp proofing experts give us a call on 0800 633 5712.

How does damp proof injection work?

Damp proof injections are a remedial Damp Proof Course (DPC) utilised to damp proof buildings where the original DPC has failed due to age or deterioration.

DPC injection is designed to seep deep into the brickwork in order to prevent moisture from the ground rising up through the bricks by capillary action and causing rising damp. The chemicals have a consistency that allows the active component, silane, to be absorbed then line the capillaries before drying. This is what creates the water repellent barrier.

Damp course injection is also an extremely long lasting solution to damp problems. Once installed, damp proof injections should remain effective for the rest of the lifespan of the property.

Damp course injection done right

Peter Cox have a meticulous process when injecting a remedial damp proof course to make sure the job is done properly: 

Firstly, our technicians will prepare the area that requires treatment both internally and externally before the damp injection begins. This may involve removing fixtures and fittings such as skirting boards and radiators to provide access.

If your property is suffering from rising damp then any salt contaminated and damaged plaster will need removed before injecting a damp proof course. Plaster is usually removed to a height of no less than a metre to expose the brickwork to the requisite level before injecting.

Small holes (around 12mm) will then be drilled horizontally into the wall mortar joint to a depth of around 10 - 20mm. The damp proof course will then be injected into the boreholes. Left in the wall, the injected chemicals will penetrate the masonry surrounding the borehole. The silane then gets to work creating a water-repelling barrier.

After the damp proof injection, our team will re-plaster internally. Our specific replastering materials will ensure that any residual salts in the brickwork do not affect the new plaster.


Find out more about replastering process


The wrong way to inject damp proof cream

The reason it is always recommended that a rated and approved contractor like Peter Cox inject a damp proof course is because there are so many errors that need to be avoided when injecting a damp proof course.

Our experienced surveyors have witnessed the following sloppy mistakes from tradespeople who lack the required training, leaving their customers unhappy and us to pick up the pieces:

  • Holes drilled directly into the brick or into stone instead of following the mortar line in a continuous line
  • Applying a new damp proof course into pre-existing holes where a previous injection has failed
  • Injecting a needless and damaging damp proofing course where an effective damp proof course already exists
  • Inject into a damaged or poor quality mortar joint that needs repaired first
  • Injecting when there is a bridged cavity walls. These fill up with debris and eventually allow moisture to pass across the damp proof course. 

To avoid any of the issues listed above, all Peter Cox install damp proof courses to BS 6576:2005 – the Code of practice for diagnosis of rising damp in walls of buildings and installation of chemical damp-proof courses.

Contact our DPC injection specialists

If your property is suffering from damp problems and you feel it could benefit from a damp proof injection, or simply want to find out the right damp treatment for you, then call Peter Cox today on 0800 633 5712. Our expert team will be able to offer help and advice to set you on the road to eradicating your damp problem for good.

Alternatively, you can book a damp proofing survey by clicking on the button below.

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Next Steps

*Survey enquiries for your local branch will be directed to our dedicated central survey control teams across the UK. Calls to 0800 and 0808 numbers are free unless you are calling from a business phone, in which case the rate will be set by your provider.