damp above window

Damp Proofing

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Damp Proofing

Have you spotted persistent damp stains in your property? If so, you could need professional damp proofing treatment to solve the problem.

Damp proofing is an umbrella term that refers to any method used to treat or prevent moisture ingress or damp from humidity. The key to identifying the correct form of damp treatment you need is correctly determining the cause of your damp problems.

Whether it is rising damp, penetrating damp, or even condensation that is causing the damp problems in your property, our fully trained and qualified specialists will diagnose the issue and create a custom treatment plan to leave your home fresh, safe, and dry.

What Causes Damp Problems on Internal and External Walls?

More often than not, damp walls are caused by penetrating damp, rising damp or condensation. These damp problems result from water ingress from an external source, ground water rising up through capillary action or inadequate ventilation.

Rising Damp

Rising damp only ever affects the ground floor. You can read more about the signs and symptoms of Rising Damp on our dedicated page, however the two main problems associated with this type of damp are tide mark stains on the wall, and the fact that these damp or salt marks extend to a maximum of around 1 metre from the ground.
Rising damp normally occurs when an existing damp proof course has been bridged by external renovation or has been damaged in some way.

Penetrating Damp

Leaks from outside the property are the main cause of penetrating damp. This will usually manifest as localised damp patches on a wall or ceiling.

Broken downpipes and gutters, cracks, faulty joints and corroded seals can all contribute to penetrating damp in a property. Leaks from inside can cause damp problems too, with wet rot often resulting from faulty plumbing or leaking washing machines and showers.


Condensation is caused by excess humidity and poor ventilation. It also creates the ideal conditions for black mould to grow. The key to solving condensation is achieving consistent relative humidity. This can often be remedied with DIY or lifestyle changes, but in serious cases treatment will require the installation of mechanical ventilation units.

Types of Damp Treatment

Just as there are several causes of damp, there are several treatments and it is important to choose the correct one.

Damp Proof Course

A common treatment for rising damp is a Damp Proof Course (DPC). Most properties should have evidence of a damp proof course about 150mm (6inch) above ground level. This may be seen as a slightly thicker mortar course with a slate or bitumen sheet poking through. These damp course materials are fairly resilient, however they can degrade over time or become damaged, leaving your home vulnerable to rising damp.

To solve rising damp problems we install a remedial damp proof course solution using a water based silicon fluid injection which creates a barrier, effectively preventing moisture from seeping into, and damaging, affected walls. This approach is fast acting and permanent, allowing affected  walls to be redecorated shortly after installation.

Damp Proof Membrane

Damp proof membranes are made of polyethylene material and applied to walls to prevent water and salts passing from the exterior to the interior of the property. This makes them particularly well suited to treating certain types of Penetrating Damp and Rising damp problems, while they are also commonly applied to basements and cellars as part of waterproofing underground rooms.

Your specialist damp proofing surveyor will assess the property to determine if damp proof membrane is required as part of your damp treatment solution.

Mechanical Ventilation

Improving ventilation in your property can be as simple as opening windows more often, adjusting the vents in your windows or removing debris from air bricks. However, some condensation and black mould problems will simply not go away until mechanical ventilation is introduced. Positive Input Ventilation units actively optomise the humidity of the air in your property reducing the chance of condensation and black moud.

How Much Does Damp Proofing Cost?

We are often questioned about our damp proofing cost, unfortunately due to the number of variables that have a direct impact on pricing, we cannot provide an estimate without visiting the property.

To give you an accurate quotation, one of our Certificated Surveyor in Remedial Treatment (CSRT) is required to conduct an extensive survey on the damp issue you may have.
The list of factors which contribute to the overall cost of damp proofing are:

  • Size of Damp Problem - The size and extent of the damp problem within your property contributes to the overall pricing of the removal service.
  • Type of Treatment - The type of treatment needed to treat damp problems will relate to the overall costs of our services. For example, our rising damp treatment costs will differ from our basement damp proofing costs.
  • Plaster Removal and Replacement - Removal and replacement of plaster will also add to the cost of any damp proofing work.

Our Damp Proofing Surveyors

Rentokil have been treating damp problems across the UK for over 60 years, providing every customer with high quality, reliable solutions to their queries. Our damp proofing specialists are known to provide an outstanding service, guaranteed to protect your home for many years to come.

All of our surveyors are highly trained professionals when it comes to remedial damp services within residential and commercial buildings. We have also received many accreditations during our years of service, certifying us as one of the most reliable an effective property care experts in the UK. Our damp proofing specialists are not only able to provide an expert service; they also keep you in the loop throughout the whole restorative process – explaining the procedures of how to get rid of damp to make sure you’re both completely on the same page. 

Contact our Damp Proofing Specialists

Our local branches of Rentokil Property Care are waiting to take your calls and online enquiries to provide all the guidance, advice and help you need to treat your damp problems.

Quite simply our long and distinguished record of success, long lasting guarantees, and outstanding customer reviews mean that there is no better damp proofing company out there for you to entrust the health of your home too. Contact your local branch today on 0800 0121 437 or click the button below to get a quote for a damp proofing survey.

1. Contact

Get in touch with us and we will arrange for your local team to contact you. 

  • Local surveyors 
  • Calls returned within 24 hours (Mon - Fri)

2. Survey

Our surveyors will discuss your damp problem with you & provide you with a quote and recommendations. 

  • Damp proofing survey appointments at a time convenient to you 
  • Tailored damp proofing solutions  
  • PCA certified

3. Treatment

Our PCA certified technicians will provide your damp proofing treatment. 

  • Damp proofing appointments at a time convenient to you 
  • Environmentally sensitive approach. 
  • Child & pet friendly treatments.

4. Aftercare

Following any guarantee treatment, you can be reassured of our long-term care

  • Guaranteed solutions for up to 30 years 
  • Prevention advice
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