Damp Proofing Services in London

Based in London, damp proofing company Crown Preservation cover Surrey, Kent, Essex & Middlesex.

Damp proofing is the act of ensuring no water or moisture can seep into the walls of your house. Currently in London, damp is one of the most common problems encountered in houses.

What do we do?

We specialise in the following treatments for both residential and commercial buildings, either for existing owners or prospective buyers:

Rising Damp & Damp Proofing

Often identifiable by a white band of salts, this is where a wall draws up moisture from the ground.


Also known as Basement or Cellar Waterproofing, this is a way of dealing with penetrating damp.


Very often overlooked as a cause of damp, and – unlike rising or penetrating damp – has to be prevented rather than treated.

Dry & Wet Rot

Various types of fungi can thrive in wood (and in the case of dry rot) plaster, cement and brick.

Wall Ties

For the stabilaisation of cavity walls due to existing wall tie failure.


Information about the more common wood beetle larvae infestations.


What Is Damp Proofing?

Damp proofing is a process in construction that is used in preventing moisture from getting through building floors and wall into interior spaces. Damp problems are common in London homes especially in the basement which is why this process is crucial in construction processes in this city. Generally, damp proofing is used in protecting the walls from exterior moisture as well as interior moisture from damaging the construction. The moisture resistance is defined by the type of materials used in the proofing, limits, test methods and engineering tolerances.

How Damp proofing Is Done?

Damp-Proof Course

Also known as DPC, this is a barrier used in masonry walls used in preventing moisture from rising through the construction via capillary action a good example being what is commonly referred to as rising damp. The proof course can be either horizontal or vertical and a layer is laid below the wall for both partition and load bearing masonry walls.

Damp-Proofing Membrane

Also referred to as DPM, this is a membrane applied in efforts to prevent the transmission of moisture. The most common example is the polyethylene sheeting that is usually laid under the concrete slabs for protection from moisture through capillary action. In some cases, the DPM can be used in DPC.

Integral Damp Proofing

This is a moisture proofing process used in concrete constructions. The process involves mixing special proofing materials with the concrete when constructing to make it impermeable.

Surface Coating

Just like the name suggests, this is a proofing method involving the coating of the structures in question with proofing materials that protect them from moisture such as rain water and other non-pressurised forms of moisture. This can also be done through spraying the structure with proofing materials.

Cavity Wall Construction

This involves the separation of the external walls from the interior walls using a cavity that breaks the transmission of moisture from outside the walls.

New build basement being tanked in Winchester

Materials Used in Damp Proofing

Some of the materials experts use in damp proofing homes in London include but not limited to flexible materials such as hot bitumen, butyl rubber, sheets of lead, copper etc. Stones, waterproofing compounds and mortar, sand layers beneath the floors, plastic sheet layers, and mastic asphalt among others.

Another picture from tanking work being carried out

Why Is Damp Proofing Needed?

Damp proofing in London is an essential process especially for buildings that at risk of dampness, which is generally most houses in the city. When moisture infiltrates the foundational structures of a structure, it will lead to the growth of mold, mites infestation, and disintegration. Some of these things are responsible for a number of illnesses while the disintegration can be a great danger because the disintegrated parts can give in leading to a collapse of some structures. The fortunate thing is that there are a number of damp proofing methods in London that can be used on different structures to ensure that the floors and the walls are protected from the moisture. This can be implemented during construction, and for already constructed houses; it can be done on the surface to keep the moisture from the walls.