Damp Proofing In Leeds, Bradford, Harrogate, York and West Yorkshire

We are damp proofing specialists, based in Leeds and Bradford. We can provide damp surveys, treat and repair damp buildings, throughout the West Yorkshire area. We are the number one choice damp proofing company in the Leeds and Bradford area, tried and tested by landlords and letting agents, as well as home owners –  Damp proofing Leeds , Bradford and West Yorkshire properties to Triton Systems’ benchmark industry standards!

Do I need a Damp Survey

Prolonged exposure to cold and wet conditions will cause eventual wear and tear on any building, so spotting the signs of damp and treating it early is the key. Walls or brickwork may eventually start to crumble (in extreme circumstances) if the moisture content in the walls is not properly addressed. As damp surveyors operating throughout West Yorkshire, we do see extreme scales of damage caused by damp. What we don’t want to see (a worse case scenario) is damp penetrating the mortar and foundation of the property. When this happens, the structural stability of your home is greatly compromised as well as requiring a lengthy repair operation. As damp proofing specialists based in West Yorkshire, our damp surveyors in Bradford, Leeds and surrounding towns can visit your home and carry out a full diagnosis and advise you of the best solution. It is estimated that 8 out of 10 homes could have damp issues and some residents do not even realise it until it’s too late.

We carry out damp proofing services in Leeds, Bradford and across West Yorkshire. If you suspect that your home is affected by rising damp, give us call. We are damp proofing specialists and with a strong base of satisfied customers throughout the region of West Yorkshire, including Leeds, Bradford, Huddersfield, Halifax, Skipton, Harrogate, Guiseley and surrounds – you can rest easy knowing that you are in the care of damp experts with years of experience. Our serviced customers in Leeds and Bradford recommend us to their friends and family for our superior quality work..See our reviews and testimonials.

damp proofing Leeds

The Background

Rising damp is found in properties and is usually evident at low levels of a properties Masonry. The root cause of this dampness finding it’s way into a dwelling is from the earth itself. When a property is built a damp proof membrane is installed just above the foundation level. In older properties this was in the form of a bitumen (tar like compound) layer being painted onto the brick/stonework to form a continuous barrier against the water from the sub earth rising through the masonry, which in itself acts like a sponge, soaking up the moisture. In newer buildings this continuous layer is in the form of a thick black plastic. This moisture from the earth contains hygroscopic salts which continuously attach this damp proof layer breaking it down over time. Damp is found in a property when this layer has been broken down and the water is then free to carry its natural course through the masonry.

Rising damp will only get to around a metre in height within the masonry as this is the level where gravity plays its natural role and forces the water downwards preventing its spread, however, This water then travels sideways (lateral damp) across the masonry and further along your walls.

In severe cases of damp ingress it will be seen that there is a white powdery substance on the plasterwork inside a home. This is the hygroscopic salts being expelled through the plasterwork and these salts start to break down the plasterworks giving it a crumbly look and feel.

The Treatment

Cemplast Preservation Ltd firstly require a survey to be completed on your property to fully inspect and asses the extent and scale of your damp problem. You shall receive an extensive report outlining all of the issues in your property and the process by which this shall be rectified.


In most cases the internal plasterwork is infected with hygroscopic salts and therefore, needs removing to a height of around 1.2 metres. This allows us to the introduce a new chemically injected damp proof course in the mortar beds above ground level which should always be at least 150mm above ground level.. Vertical DPCs should be provided to connect horizontal DPCs where ground levels change and to isolate untreated wall areas (adjoining properties, garden walls, etc).

Our damp proof courses are installed to the specification given in ‘Code of Practice for Installation of Chemical Damp Proof Courses’ BS6576 (1985) To achieve this a series of 12mm holes are drilled at no greater speration than 120mm. These holes are then filled with a specially designed cream which will spread throughout the mortar bed and form a continuous barrier to the damp.


Once the chemically injected damp proof course has been installed correctly the walls that have been treated are rendered as a backing coat to the plaster. This rendering solution should stick to strict guidelines provided by Triton and contain a specially designed salt neutralizer to prevent any future salt contamination. The render should consist of portland cement to BS12, sharp sand that conforms to BS 1199 at a mix of 1:3. Our team are fully experienced in all aspects of Rendering.

Once this has dried The final coat of porous lightweight plaster should be applied.

Penetrating Damp

The Background

Penetrating damp is another form of damp that can invade your home. This has a different route into your property than rising damp as it is does not travel from the ground upwards. Penetrating damp is the transfer of moisture from the external of your property (external walls) to the inside of your property directly through the masonry. This is mostly a problem when a dwelling has a basement, however, it can occur on other levels of your property that are not underground for a number of reasons:
Your property has through stones that bridge the cavity Your property has cavity wall insulation and this has become wet Your property has little to no cavity or the cavity is rubble filled

The Treatment

There are a number of ways that this problem can be rectified, however, much the same as rising damp, in most cases, the affected wall plaster shall have to be removed. Cemplast Preservation LTD shall similarly visit your property to undergo a thorough investigation of the problem and supply you with a detailed report outlining the problems and solution.

Once the plasterwork has been removed Cemplast shall either:

Cover the area with a tanking membrane, or
Apply 2 coats of tanking slurry

Tanking membrane

This is a thick plastic sheeting used to damp-proof above ground walls. The advantages of this system is that it can be worked on immediately after installation, which means no waiting time.

This membrane is affixed to the wall using sealed plaster plugs. It is then pulled as tight as possible to remove any sagging, a minimum of 13 plaster plugs per m2 should be applied using a diamond pattern. This can then be rendered or plaster boarded to before finally plastering.

Cemplast Preservation LTD use Triton tanking slurry to prevent penetrating damp ingress. This is a cementitious solution that is applied in 2 coats and forms barrier to water ingress