Damp Proof Membrane

What is a Damp Proof Membrane and Why is it Needed?


What is Damp Proofing?

In construction, damp proofing is the moisture control applied to walls and floors that will prevent moisture from entering the building through the exterior walls. Moisture coming through from groundwater seepage is called rising damp. Moisture coming through from the rain or leaking gutters etc is called penetrating damp.

Preventing moisture ingress from causing damp walls is important for your property as excess moisture leads to cosmetic damage and even structural movement. It is important that your building has reliable damp proofing solutions in place in order to prevent this damage.

Understanding Damp Proof Membranes

A damp proof membrane is a high density polyethylene material that creates an efficient barrier to prevent moisture from penetrating internal walls and floors. There are different types of damp proof membranes: liquid, sheet, and stud formation membranes. The damp proof membrane work to prevent moisture rising into the building and effecting the timbers.

A damp proof membrane is strong and flexible, making it a long-lasting and reliable damp proofing solution. It differs from a damp proof course (DPC) as the DPC is placed above ground level and often in addition to the damp proof membrane.

Installation and Application

Installation of a damp proof membrane is usually done during the construction of the building. However, it is possible to damp proof an existing floor using a liquid damp proof membrane.

Prior to rectifying the issue, it is important to identify the source of the excess moisture and assess for any serious damage that needs to be addressed and to eliminate the health risks associated with persistent damp problems.

Once the excess moisture issue has been resolved and there has been a reasonable drying out period for plaster and concrete, work can begin to fully damp proof the wall or floor.

It is often recommended that a damp proof membrane be used in conjunction with a damp proof course in order to ensure full protection from rising and penetrating dampness.

Common application areas for damp proof membranes: walls, floors, and underneath concrete floors to prevent moisture from seeping in.

Benefits of Damp Proof Membranes

A damp proof membrane prevents moisture ingress by creating an air gap that allows moisture to evaporate while leaving the wall undamaged

Damp proofing membranes are cost-effective, easy to install, and provide a reliable damp proofing solution. They provide protection against damp patches, mould growth and associated health risks such as respiratory issues and allergy triggers. However, to ensure that you adhere to building regulations, always consult a professional before beginning the installation process. A professional damp survey can help to identify problem areas of damp and condensation and make recommendations for remedial works prior to damp proofing.

Common Mistakes to Avoid

Incorrect installation or application of damp proof membranes can lead to surface tears or holes in the plastic membrane sheet can allow moisture to penetrate through to the wall.

Insufficient or inadequate damp proofing preparation measures include failure to address the root cause of the damp problem such as rising damp, penetrating damp, and excess condensation can lead to further issues.

Failure to maintain or inspect damp proof membranes, neglecting to check for damage or wear and tear can mean that you damp proof membrane fails over time and results in problems with damp patches in the future.

Choosing the Right Damp Proof Membrane

Factors to consider when selecting a damp proof membrane include material, thickness, and certifications (e.g., BBA approval) You must always ensure that the membrane meets British Standards and is suitable for the specific application. Consider where you are applying the membrane such as walls or concrete floors, how severe the dampness is etc.

Choosing a reputable supplier with experience in damp proofing is key. A professional installation will often come with a guarantee and therefore peace of mind. Get in touch with Damp Surveyors Ltd today for a free, no obligation quote for your damp proofing needs.

Conclusion and Next Steps

Damp proof membranes are a crucial material in damp proofing for preventing moisture ingress and damage to buildings.

Consulting with a damp proofing specialist or seeking online resources is key to preserving the integrity of your home or property and keeping it damp free for years to come.

Get in touch with Damp Surveyors Ltdfor further information on protecting your home today.

  • Call to action for readers to take the next step in their damp proofing journey: contacting a professional or seeking more information on damp proof membranes.

Table of Contents

Picture of Sam Fitzgerald – CSRT Damp Surveyor

Sam Fitzgerald – CSRT Damp Surveyor

Author – CSRT Damp Surveyor
Sam is a highly qualified and seasoned damp surveyor with over ten years of specialised experience. With a strong academic foundation in building surveying and numerous professional certifications, Sam has established himself as an authority in the field of damp diagnosis and remediation.

At Damp Surveyors Ltd, Sam applies his extensive knowledge to help homeowners across the UK address and solve their damp issues effectively. His approach combines cutting-edge techniques with a commitment to honest, client-focused service, ensuring that every survey and recommendation is tailored to the specific needs of the property.

As a thought leader, Sam’s insights into damp prevention and treatment have been featured in industry publications, underscoring his role as a trusted expert dedicated to maintaining the integrity and comfort of your home.

Testing device for measuring dampness in a house


At Damp Surveyors Ltd, we stand out as your premier choice for damp survey services in the UK. Our commitment to excellence and customer satisfaction sets us apart. Here’s why you should choose us:

  • Exclusive 3 Free Quotes: We offer a one-of-a-kind optional service where you not only get our top-notch damp survey but also receive 3 free quotes from vetted local companies, giving you peace of mind by saving you thousands on getting the most competitive quotes, and also time researching and contacting other reputable companies.
  • Knowledge and Experience: We provide unmatched knowledge to every survey we conduct thanks to our team of seasoned professionals and years of industry experience. This guarantees accurate assessments and practical solutions.
  • Nationwide Coverage: Whether you’re in a bustling city or a rural area, our services extend across the UK, making us accessible wherever your property is located. Choose us for nationwide reliability and excellence.

Choose Damp Surveyors Ltd as your reliable partner for all-inclusive survey needs. Our top concerns are the health and safety of your property, and we are committed to providing outcomes you can trust.

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