Performance Tanking Render
A ready mixed waterproof natural cement tanking render for internal and external masonry requiring robust protection from water and sulphate penetration.
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More about Performance Tanking Render
Cornerstone Performance Tanking Render is a dry ready mixed waterproof natural cement tanking render for the robust protection of internal masonry from water and salts below the ground level. Available in the colour tan.
Engineered with precision, utilising Prompt Natural Cement, natural sands and a retarder to create a high-performance render for the tanking of substrates to prevent water penetration and long-term durability against harsh environmental elements. Since the mid-19th century, Prompt Natural Cement has been utilised across Europe for mortars, renders, and marine applications. Free of synthetic polymers and Portland Cement. Available as standard with Prompt Natural Cement.
Well-suited to provide robust protection to internal and external masonry from water and salts and is viable for listed buildings and solid masonry when alternative methods have proven inadequate.
- Contains no Portland Cement
- Contains no modern synthetic polymers
- Waterproof at 20mm
- Robust long-term protection
- More flexible than most conventional tanking options
- Robust resistance to salts
- Naturally sulphate resistant
- Highly adhesive to reduce the risk of debonding
- Can be finished with a lime render or plaster
- Stiffens quickly for a speedy finishing time
Suitable for internal or external use, where the binder strength is appropriate for the host background or surface.
Relevant for a two-coat internal or external application at a minimum thickness of 10mm per coat to provide protection from water and salt ingress. Appropriate for various project types, including conservation and renovation.
While Performance Tanking Render is entirely natural in colour and absent of any pigments, the environmental conditions and curing process will affect the final colour achieved. In general, we recommend applying a finishing coat on top. We recommend Insulating Render as a third coat of lime render on top of Performance Tanking Render internally to manage any potential sweating of the two initial layers. For external applications, explore Promix Medium Topcoat or Promix Fine Topcoat.
As a natural cement-based render, Performance Tanking Render is unsuitable for use on some background substrates, including certain low-strength limestone, sandstone or other compromised surfaces.
A 25kg bag yields approximately 15 litres of render and covers roughly 1.5m² at a 10mm thickness. On-site trials are advised for the best yield indication for your specific project.
Supplied in 25kg polythene-lined and colour and batch-coded paper bags for easy identification on-site. Palletised for ease of transport, storage, and handling.
Do not use in temperatures below 5°C or above 30°C, or if freezing conditions are predicted within the following few weeks, including wind chill. We always advise following best practices for curing and protecting fresh lime mortars. Protect from adverse environmental conditions, including frost, rain, direct sunlight and drying winds.
Store in covered and dry conditions, protected from environmental conditions, including water, damp or frost and clear from the ground. Always reseal packaging if product is still present.
Always read the available documentation before use. See the Download Documentation section below for more detailed product information, application guidance and datasheets.
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