Tanking basement walls

Basement Waterproofing

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Tanking Cellar Walls

Many properties have cellars that were never designed for modern living, and as a result, they can suffer from damp problems, leaks and flooding. This is why we have prepared this helpful how-to guide to provide all the information you need to get started tanking your cellar walls to ensure they remain waterproof and ready to be used as a dry, functional space.

If you want your cellar surveyed by an experienced waterproofing professional, get in touch with Rentokil Property Care today by filling in the online contact form below or call us on 0800 0121 437.

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Tanking cellar walls with slurry

When people are thinking of tanking their basement or cellar they often wonder if they need to wait until the walls have dried up first. In actual fact, cementitious tanking slurry is designed so that it can even be applied directly to wet walls to begin the process.

When tanking cellars our experts apply a minimum of two coats or more of slurry depending on the circumstances. The first of which needs to be applied horizontally to the wall and should go down to the wall-floor joint. Tanking should be touch dry and able to support a second coat within 24 hours.

If you are going to leave the tanking exposed for a while before applying a finish to the wall, you should apply an extra splatter coat to ensure an adequate key before rendering.

Is cellar tanking enough to waterproof your walls?

The reality is that for some cellars prone to extreme hydrostatic pressure, subsidence, or even heavy vibrations from nearby roads or train tracks, simply tanking the wall with cementitious slurry will not be enough to ensure the cellar remains dry.

That is why we always advise our clients that they should attain a cellar tanking survey before proceeding with any work. A survey allows us to identify any potential problems and enables us to suggest when a more reactive and adaptable waterproofing system may be required.

Typically this would require the use of cellar tanking membrane, often in combination with a drainage system to safely flush out any water that gathers behind the waterproof membrane.

Using waterproof membrane to tank cellar walls

Cellar tanking membrane is essentially a studded sheet of damp proof plastic that will manage any water ingress into the cellar.

The studs raise the membrane from the wall and channel any water ingress into an appropriate drainage channel and away from the property. Alongside cellar waterproofing, tanking membranes can also be used to waterproof floors, basements, crawlspaces, storage areas and tunnels.

Applying cellar tanking membrane to walls

Once the cellar is prepared by removing damaged plaster and treating moulds, fungus or other contaminants where appropriate, our technicians will fit the tanking membrane against the wall and drill specially designed studs that will hold fixings that secure the membrane to the wall. When fixing the membrane the sheets will overlap and joints need to be sealed with waterproof tape to avoid any gaps.

Best of all, if you are considering a cellar conversion, the tanking membrane can have render or plaster finishes applied directly to it or it can be used behind false walls or galvanised steel trunking.

Cellar tanking membrane will typically work in conjunction with drainage channels and a sump pump to form what is known as a Type C waterproofing system.

Contact our cellar waterproofing professionals

Effectively tanking a cellar requires a great deal of specialist knowledge and experience if you want to be absolutely sure that it is both applied correctly, and to be certain that it is the most appropriate solution to keep your cellar dry in the first place.

The professional waterproofing experts at Rentokil Property Care have a wealth of experience when it comes to applying cellar tanking solutions and plenty of experience repairing tanking systems that have gone wrong. If you want professional help and advice when it comes to tanking your cellar our team are ready to take your call on 0800 0121 437 or click the button below to fill in a quick contact form and we will get back to you.

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