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Damp Proofing

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Damp Proofing

Our damp proofing guide has been designed to help you identify and repair damp issues before they turn into major problems that require expensive treatment to rectify.

If you feel that you would benefit from professional damp proofing advice to diagnose the issue and create a custom treatment plan to leave your home fresh, safe, and dry, then you can talk to our fully trained and qualified specialists by clicking the button below.

What is Damp proofing?

Damp proofing is a general term that covers methods and treatments used to prevent damp from being absorbed through walls or floors into the interior of a property.

The actual method of damp treatment you require varies depending on the actual cause of your issues. Our guide will now go on to look at the various types of damp to help you identify which is present in your home and what form of damp treatment you need to solve it.

Causes of Damp and How to spot them

If you require damp proofing services, then usually it is because you are seeing damp walls caused by either rising damp,  penetrating damp, or condensation.

These damp problems result from water ingress from an external source, groundwater rising into the wall through capillary action, or inadequate ventilation.

Rising Damp

Rising damp will only occur when an existing damp proof course (DPC) has been bridged or damaged in some way. This allows rainwater in the ground to seep into the building through bricks and mortar by a process called capillary action.

It is important to note that it will only ever affects the ground floor, and symptoms on internal walls include:

  • Damp walls and a ‘tide stain’ above the skirting board
  • Evidence of salt deposits left on the wall
  • Damaged or rotting skirting boards, plaster and wallpaper

Penetrating Damp Problems

Water leaking in from outside the property is 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 are all contributing factors. Leaks from inside can cause problems too, and wet rot can often accompany damp from faulty plumbing or leaking washing machines and showers.

The signs of penetrating damp are:

  • Visible damp or even moss growth on external walls
  • Walls and ceilings with damp above the first floor
  • Wet plaster (if over 1m high)

Condensation on Internal Walls

Condensation is caused by excess humidity and poor ventilation. It also creates ideal conditions for black mould to grow.

Look out for excessive moisture or water droplets and black spot mould around:

  • Walls, ceilings and attics
  • On furniture, curtains and other soft furnishings
  • ‘Hotpoints’ like bathrooms and on or around windows

Methods of Damp Treatment Explained

Now that our guide has helped you to spot the signs of damp and identify which is present in your home, we will now look at the various forms of damp treatment and which one is right for you.

How to Solve Rising Damp

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 evidence of a slate or bitumen sheet. These materials are fairly resilient, however, they can degrade, become damaged or bridged by modifications, leaving your home vulnerable to rising damp.

To damp proof properties affected by this, the most common solution is to inject a silicon remedial damp proof course which creates a waterproof barrier, effectively preventing moisture from seeping into, and damaging, affected walls. DPC injection is a fast-acting and permanent method of damp proofing and allows affected walls to be redecorated shortly after installation.

Fixing Penetrating Damp

Naturally, the first step is to solve the issue that is allowing the water ingress in the first place. In some cases, this just requires a simple DIY solution to solve faults such as a damaged roof tile or crack in the external wall, although it may be the case that a professional restoration service is required.

Frequently the homeowner will be required to strip the affected area of the plaster and to install a layer of damp proofing membrane in the wall before replastering.

Unfortunately, this type of damp has the potential to create more serious issues like wet or dry rot, so we would suggest that you should thoroughly investigate the property for signs of rot or associated damage before attempting to replaster the wall. Otherwise, you may install damp proofing measures required to fix the initial cause, while much worse issues continue to fester inside the property.

Condensation Treatment

The key to damp proofing properties affected by condensation is achieving consistent relative humidity. This can often be remedied with DIY or lifestyle changes, but in serious cases treatment will require a coating with anti-condensation paint or the installation of mechanical ventilation units.

How to Damp Proof Underground Spaces

Damp or flooding in an underground space like a basement or cellar usually comes under the heading of waterproofing rather than damp proofing.

At Rentokil Property Care we also provide a full suite of waterproofing treatments, including the application of slurry, damp proof membranes and sump pump installation that you can read about on our basement waterproofing page.

How Much Does Damp Proofing Cost?

Due to the number of variables that have a direct impact on pricing, we cannot provide a damp proofing estimate without visiting the property.

To give you an accurate quotation, one of our CSRT and CSSW qualified surveyors will conduct an extensive survey of your property.

The list of factors which will contribute to the overall cost of damp proofing are:

  • The size and extent of the issue within your property
  •  The type of damp proofing treatment required will determine the overall costs of our services
  • Removal of plaster and subsequent replastering will also add to the cost of any damp proofing work

Our Damp Proofing Surveyors

All of our surveyors are highly trained professionals in remedial damp proofing for residential and commercial buildings. We are accredited by a number of trade associations, certifying us as one of the most reliable and 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 to make sure you’re both completely on the same page.

Contact our Damp Proofing Team

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 get started damp proofing your home.

Quite simply our long and distinguished record of success, long-lasting guarantees, and outstanding customer reviews mean that there is no better 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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