Seal damp walls

Tanking Slurry

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How to Tank damp walls

Order and Free Technical Help - 01626 872886 - discuss your Tanking job with a Qualified Dampness Expert (C.R.D.S.) We will help you to choose the correct Tanking product and give you detailed help.

Hydradry Tanking Slurry

Professional & DIY - cement based - easy to apply, just add water, BBA Certificate.

Brush on one coat of Tanking slurry going in one directionBrush on a second coat of Tanking at 90 degrees to the first, to avoid leaving 'pinholes' of weakness in your waterprrof coating.

Brush Tanking Slurry onto a damp surface with a brush, second coat brushed at 90 degrees.

As used by the Trade - rapid drying, easy to apply

1. Cellars, basements, below DPC

2. Easy to brush apply

3. No smell, no vapour, plaster over

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Hydradry Tanking Powder

Packaging - powder is supplied in a 25kgs plastic bucket

Application - damp wall, use brush, two coats

Sizes - 25kgs

How to calculate use - allow 8-10 square metres per coat per 25kgs, 3-4 sq.m for two coats.

Limitations - not suitable to apply to surfaces that have water actively weeping or running through them at the time of coating.

Note - if you have running water or weeping requires relief holes and/or a sump, in order to allow the Tanking Slurry to fully cure with no risk of damage. For small holes or weeps use our Rapid Plug material, before Tanking.

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Joint Filling Mix - Fillet Seal

You will need to cut out the joint around the floor up against the wall. This can then be filled with a waterproof mortar - Fillet Seal.

Note - when installing a Damp Proof Course, which should be positioned at least 6 inches (150mm) above outside ground level, you may need to apply Tanking Slurry to any area inside the building where the new damp course will be above floor level. This avoids dampness behind the plaster and skirting boards causing damage. If you are finishing down to a solid (concrete) floor you will need to rake out the floor to wall joint and fill with a waterproof grout made of BondAcryl and sand/cement mix at 4:1. This will seal the high vapour pressure area and should join with the under floor membrane (usually plastic) and the new Tanking Slurry wall membrane.

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Site written by: David Moore

David Moore, B.A. (Hons.), C.T.I.S., C.R.D.S. Technical Author


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