what is damp

Damp

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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.

Any property can be subject to damp problems, especially older properties which may have been constructed without a damp-proof membrane. Whether it’s rising damp or penetrating damp, our property care specialists are experts at identifying the types of damp within a property as well as potential problems.

Types of Damp Protection

The two types of protection methods for damp proofing residential and commercial properties are Damp Proof Course (DPC) and Damp Proof Membrane (DPM)

Most properties we live in today 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, unless movement of the building subsidence causes them to crack.

There is sometimes confusion between what a damp proof membrane is and what a damp proof course is, particularly as they can be used together. We advise linking the two to allow a building to be fully protected from the damp, wet ground around it.

What is a Damp Proof Course?

A damp proof course (DPC) is one of several damp proofing treatments used to prevent damp problems developing within a property. Damp proof course repair can be applied using a variety of different methods and is a long term solution to preclude moisture from entering a property through walls. The build-up of excess moisture within a building can eventually result in structural damage and therefore pose a risk to your property.

Our property care specialists are experts at identifying the types of damp within a property as well as potential problems and will apply the most suitable treatment based on damp proof course regulations. All our injected damp proof course treatments come with a 30 year damp proof course guarantee to ensure a safe and stable property.

How Does a Damp Proof Course Work?

Rentokil’s damp proof course solution is a chemical damp course (water based silicon fluid) which creates a barrier, effectively preventing moisture from seeping into, and damaging, affected walls. Rentokil technicians are thoroughly trained and experienced in installing a damp proof course.
Damp proof course in solid wall and suspended timber floor construction

Damp proof course in solid wall and suspended timber floor construction

What is a Damp Proof Membrane

A damp proof membrane (DPM) is another common method used to prevent rising damp from occurring within a property. Our damp proof membrane sheets are made from materials such as polyethylene or butyl rubber and act as a successful barrier to prevent damp from making it's way into a property. Our well-qualified technicians have a great understanding in how to resolve damp issues and are experienced in installing damp proof membranes for walls and floors within a property.

How Does a Damp Proof Membrane Work?

A sheet of material (impervious to water) laid in one piece that is placed beneath the concrete floor of a property to prevent groundwater seeping upwards through the concrete base. A common example is polyethylene sheeting laid under a concrete slab.

Damp proof course in cavity wall, with damp proof membrane under solid floor

Damp proof course in cavity wall, with damp proof membrane under solid floor

Damp Proofing Walls

The build-up of excess moisture within a building can lead to damp walls which can eventually result into a handful of problems. If you notice signs of damp on walls within your property then we strongly advise you act fast to resolve the issue. Damp on internal walls is unsightly, unhealthy and is the primary cause of wood decay in a building, which can put your property at risk of structural damage.

Our property care specialists have many years’ experience in treating damp walls and are experts at applying the appropriate damp proof course based on your requirements. Damp proofing internal walls come as a second nature to us so you can be sure your property is in safe hands.
 

Damp Proofing Concrete Floor

We offer professional damp concrete floor treatments to help eliminate rising damp from within a property. This can be caused by the lack, breakdown or bridging of a physical damp course, or the absence or damage of a damp proof membrane.

Our damp proof membranes for concrete floors are an effective solution to counter rising damp and at Rentokil, our property care specialists are registered TrustMark contractors and proud members of the PCA so you know that your property is in safe hands.

Remedial Damp Protection

Issues with your current damp protection can occur due to subsidence or the result of long term deterioration which allows damp to rise through the walls. If you begin to notice: 

  • Peeling paint or wallpaper
  • Discolouration
  • Decaying skirting boards and timber floors 
  • Salt staining 
  • Crumbling plaster

Our Certificated Surveyor in Remedial Treatment can conduct a professional damp survey to identify the cause of damp. Rentokil's remedial damp proof course can then be installed to ensure your property is damp protected. 

If you believe you have issues with your current damp protection contact Rentokil today to book your survey appointment.

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