Damp and Timber Specialists for 50 years

Effective Damp Proofing Backed by the Prokil Guarantee

Damp proofing is essential for protecting your home or business from unwanted moisture. Left untreated, damp can cause structural damage, rot timber, and encourage black mould. These pose health risks, especially for those with asthma or respiratory conditions. According to NHS guidance, exposure to damp and mould can increase the risk of breathing problems and allergic reactions.

At Prokil, we do not just cover over the symptoms. Our qualified surveyors find the root cause and suggest long-term treatments tailored to your property. This could be a chemical damp proof course, membrane system, tanking, or improved ventilation.

With more than 50 years of experience and approval from PCA and TrustMark, we have carried out thousands of successful treatments. That is why people across the South trust us for dependable, long-lasting results. Plus, every job is backed by The Prokil Guarantee, offering reassurance that your property is protected for years to come.


Why Choose Prokil?

At Prokil, we do things differently. Our surveyors are not salespeople. They are trained professionals who assess your property without pressure or gimmicks. If work is needed, we explain what is involved and why, using plain language and fixed-price quotes.

Each member of our survey team is qualified or is pursuing certifications in damp, timber, structural repairs, or waterproofing. That includes CSRT, CSTDB, and CSSW accreditations, so you can be confident that the right person is assessing your property. You will always deal with someone who understands your property, not someone following a script.

We have helped over 37,000 clients, from landlords and homeowners to commercial developers. We provide honest recommendations, detailed reports, and practical repairs that get to the root cause of the issue. Take a look at our case studies to see how we work in practice.

How Our Damp Proofing Works

We do not believe in a one-size-fits-all fix. Every building is unique, so our damp treatments are tailored to your property’s construction, condition, and type of damp.

Once we have carried out a full damp survey, your surveyor will explain what is causing the issue and what is needed to solve it.

Depending on the diagnosis, we may recommend one or more of the following treatments:

  • Install a chemical damp-proof course with injection techniques. This stops rising damp from spreading in the walls.
  • Apply salt-neutralising agents to prevent residual salts from damaging plaster and finishes.
  • Laying a damp proof membrane is often done using specialist rendering systems.
  • Use specialist epoxy resins when concrete floors lack a good damp-proof membrane or when old barriers have failed.
  • Slurry tanking or waterproof coatings stop moisture from getting into walls and floors.
  • Mechanical systems can boost ventilation. Extractor fans and positive input ventilation units work well in places with excess condensation.

Our in-house team of trained technicians installs each solution. If your property requires multiple forms of treatment, we explain why and how they work together to give you lasting protection.

Visit our Condensation Damp services page to see how we tackle moisture and condensation in homes.

Do I Need Damp Proofing? Common Signs to Watch For

You may already be seeing signs of damp without realising what is causing them. If you notice any of the following symptoms, it might be time.

When to consider a damp survey:

  • Peeling wallpaper or bubbling plaster
  • Dark patches on walls or ceilings that will not dry
  • Musty smells or black mould near skirting boards or windows
  • Crumbling timber, particularly around floor edges
  • Tide marks or white salt deposits on the ground-floor walls

One of the most common signs we see is damp rising from the base of walls, sometimes referred to as “tide marks.” This may indicate a failed or missing damp proof course. You can learn more about this on our rising damp service page, where we explain how we diagnose and treat it using proven DPC methods.

If black mould appears, especially in cold or humid areas, our mould treatment services can tackle the problem. We also work to prevent future outbreaks by managing the conditions that led to them.

What to Expect from Your Prokil Damp Survey

When you book a damp survey with Prokil, we do not glance at your walls; we conduct a thorough, qualified inspection. Every survey is designed to pinpoint the cause of the problem and recommend the right solution the first time.

Here is what is included:

  1. Visual inspection of affected areas, including internal and external signs.
  2. Moisture testing uses calibrated tools. These include radio frequency meters, salt analysis, and calcium carbide tests.
  3. Diagnosis of the damp type, whether that is rising damp, condensation, or penetrating damp.
  4. A clear, written report that explains our findings in simple terms and shows your treatment options.
  5. A fixed quote, with no obligation to proceed.

We explain our findings in plain English and clearly explain your options. We arrange a time that suits you if treatment is needed and complete the work with minimal disruption.

The Risks of Untreated Damp

Leaving damp untreated is not just a cosmetic problem. Over time, too much moisture can weaken a building’s structure and harm the health of people living or working there.

Damp can lead to:

  • Wood rot and timber decay, particularly in floor joists and skirting
  • Increased heating bills due to poor insulation and cold walls
  • Black mould growth, which is known to aggravate respiratory conditions like asthma
  • Damage to plasterwork and internal finishes, requiring costly repairs

The sooner the problem is identified and treated, the easier it is to contain and fix. With the right treatment plan, you can restore the condition of your building and reduce long-term maintenance costs.

Book Your Damp Survey Today

The sooner you act, the easier – and cheaper – it is to fix.

Damp proofing is more than fixing looks; it protects your health, keeps your property safe, and stops costly repairs later. If dampness goes untreated, it can spread rapidly through walls, timber, and floors. This decreases energy efficiency and creates an excellent environment for mould to thrive.

At Prokil, our expert surveyors identify the source of the problem and recommend a treatment plan tailored to your property. With over 50 years of experience and fully qualified in-house teams, you can count on us to do the job right. We also provide The Prokil Guarantee, meaning there is no pressure or guesswork for you. For more advice on damp types, treatments, and what to expect, visit our blog and advice section.

Contact us today to book your damp survey, or call 0800 048 9488 to speak with your local team.


Book a survey today

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What to expect from your survey

1

Book a survey

Book a survey from any of our locations, at a time that suits you.

2

Our experts give a quote

One of our damp & timber experts will arrive to survey the work.

3

We complete the work

Based on a quote, we carry out the work guaranteed for 20 years.