Damp proofing a house

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. 

Why Damp Proofing is Important

Issues such as damp and rot can eventually cause structural damage to your property, so it is essential to identify the signs of damp as early as possible to help prevent any further damage.

If the physical barrier of damp proofing (to walls or floors) in a property is damaged, absent or bridged in any way it can potentially lead to building problems such as:

    • Rising Damp - The capillary movement of water up the walls of a building, which can result in damage to the plaster and internal decorations. Learn more »
    • Dry Rot - Timber with a moisture content above 20% gives wood destroying fungas the opportunity to grow. Learn more »
    • Wet Rot -  Present in timber with a moisture content much higher than that required for dry rot and usually above 40%. Learn more »

Usually when a property is constructed a preventative damp proof course is built into the walls, just above ground level. This is often known simply as a DPC and is one of several solutions for damp control in a building. 

Worried About Damp? - Get In Touch

We provide an extensive damp proofing inspection by qualified surveyors who will assess and correctly diagnose the extent and type of dampness affecting your property.

Our experts will recommend property specific damp proofing treatments for the most effective way to treat your damp problem.

Book your survey appointment online NOW

Types of Damp Protection

The Public Health Act of 1875 set laws for ground-level damp protection. All subsequent properties should have been built with some form of damp proofing.

The two types of protection methods for damp proofing residential and commercial properties are:

    • Damp Proof Course (DPC) -  A preventative barrier of slate, bitumen or plastic membrane built into the walls of a property, about 150mm above ground level to prevent damp rising through the walls.
    • Damp Proof Membrane (DPM) - 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.

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

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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