Basement Waterproofing In Belfast & Northern Ireland

For both new build and existing basement waterproofing and cellar waterproofing, we offer water proofing design and consultation as well as technical advice from our PCA registered and C.S.S.W Surveyor. We can also undertake any works needed from the design.

Call Us:

028 9060 5058

Email Us:

WhatsApp Us:

+44 28 9060 5058

Messenger Us:


Basement Waterproofing

Converting damp basements and other spaces below ground level into dry rooms can be a cost-effective and highly rewarding way of extending a home or utilising space within an existing property.

Toner Damp Proofing Ltd based in Belfast but cover all of Northern Ireland specialise in structural waterproofing systems that are employed to upgrade existing basement rooms, waterproof new buildings or convert damp, unused spaces below ground into dry habitable rooms.

Structural waterproofing below ground is a highly specialised operation and must be undertaken by contractors and designers who have the requisite levels of skill, understanding and experience. Failures resulting from inadequate specifications or poor workmanship can be very costly. Toner Damp Proofing Ltd who specialise in structural waterproofing is able to work with the client to design a suitable waterproofing solution.

There are two approaches to waterproofing a basement. one method involves cementitious tanking with a waterproofing render or waterproofing slurry. this creates a barrier to the water, preventing it from entering the living space because the water is prevented from entering the building, water pressure can build up on the exterior of the building causing additional loading on the structure. In addition, for the cementitious tanking to be effective, it requires a good bond with the underlying substrate. Cementitious tanking is therefore only suitable for structures capable of supporting the additional loading of any water pressure and with a strong sound substrate.

Most refurbishment projects tend to use the alternative approach of a water management system, this involves the installation of cavity drainage membranes and a suitable drainage system (usually a sump and pump). The moisture is trapped behind a polypropylene membrane, requiring a suitable drainage system to channel the water to an appropriate drainage point, depending on the levels of moisture ingress. This approach will allow water to still enter the fabric of the building but prevents it from entering the living space. as the passage of the water is not blocked, there is no additional loading on the structure and minimal surface preparation is normally required. The disadvantage is that in most cases a sump and pump system is required to remove the moisture and these have to be regularly inspected and maintained.

Waterproofing techniques are defined in BS 8102:(2022), the British Standard for “Protection of below ground structures against water ingress”. Contractors must demonstrate an understanding of this standard and the association’s code of practice for underground waterproofing.

If you suspect you have basement waterproofing issues, you can book a professionally qualified C.S.S.W | C.S.R.T surveyor through our contact page.

Property Care Association (PCA) Registered

Toner Damp Proofing Ltd puts customer care at the heart of our business and adheres to offer the highest standards for our customers. Toner Damp Proofing Ltd are full member’s of the Property Care Association (PCA) it is the trade association of property specialists covering the Northern Ireland, UK and Ireland who can be trusted to resolve problems affecting your building. PCA members include contractors, independent and freelance surveyors, consultants and manufacturers. You can always find Toner Damp proofing Ltd nearby with the expertise required for your project.

Property Care Association (PCA)

We are full members of the industry's trade association the PCA for damp proofing, waterproofing & timber preservation.

C.S.S.W Surveyor

Specialist in the protection of below ground structures against water from the ground awarded by the PCA.

C.S.R.T Surveyor

A national recognised qualification for the identification of damp and timber defects in buildings awared by the PCA.

Fully Insured

Toner Damp Proofing Ltd is fully insured for our customers protection. This mean less worrying for you when using us.

16+ Years Experience

Successfully carrying out damp proofing, waterproofing and timber treatment works throughout Northern Ireland for our clients.

Protected Guarantee

As well as our own company guarantees, we can offer Guaranteed Protection Insurances (GPI) for peace of mind and security.

Areas We Cover
Keeping Northern Ireland Dry

We have always been committed to keeping Northern Ireland homes dry and will continue for many of years to come. Our staff and surveyors, are all paid salaries rather than being commission-based like many of our competitors in the damp proofing industry. This means they don’t feel pressure to oversell services or treatments to customers, and can provide honest advice without any expectation or obligation for customers to purchase our services.

Damp Proofing Treatments
0 +
Timer Treatments
0 +
Structural Waterproofing Jobs
0 +
Small Family Business
Contact Us
Other Services We Offer


Damp and Timber Survey being carried out in Belfast Northern Ireland by Toner Damp Proofing Ltd

Damp & Timber Survey


Basement Waterproofing

Penetrating Damp

Penetrating Damp

Rising Damp Application By Toner Damp Proofing Ltd in Belfast Northern Ireland

Rising Damp