A ready mixed ultra-lightweight and low density fibred plaster to enhance the thermal insulation of solid walled masonry suitable for use within a two coat render application. Available in a 3.75kg bag.
£22.85 £27.42 inc VAT
In stock
Estimated lead time is 3-5 business days
Cornerstone SuperTherm is a dry ready mixed lime plaster designed as an ultra-lightweight and low density insulation layer and fibred basecoat for internal applications within a minimum of a two-coat plaster application. Available in the colour off-white.
Manufactured by Cornerstone to provide a revolutionary internal lime plaster with an unmatched insulating performance. Utilising an innovative foamed aggregate with a nanometre pore structure that prevents the directional flow of heat that results in heat loss through the building envelope while providing moisture management. Available as standard with fibres and a high-purity Calcium Hydroxide with pozzolan.
As part of the Cornerstone range of insulating renders and plasters, Cornerstone SuperTherm provides an innovative solution that functions as both a base coat plaster and a high-performance thermal layer.
Well-suited for projects requiring an ultra-lightweight plaster with exceptional insulating properties, with a measured K Value of 0.04, a 50mm application will improve the U value of a solid wall by more than 75%.
With a diverse range of lime-based products, Cornerstone defies the standard one-size-fits-all approach, providing refined solutions to tackle each project effectively. Their products can be found on prestigious buildings worldwide, blending innovation with tradition to meet evolving industry needs.
Suitable for internal use, where the binder strength is appropriate for the host background or surface.
Relevant for applications requiring an insulation layer, SuperTherm can be applied directly to the wall as a basecoat plaster within a suitable plaster system, eliminating the need for boarded systems. SuperTherm requires a topcoat finish, including Cornerstone SuperTherm Finishing Plaster, Cornerstone Promix Fine Topcoat or Cornerstone Promix Medium Topcoat. Appropriate for various project types, including conservation, renovation, or sustainable construction.
A 3.75kg bag yields up to 15 litres of lime render or plaster and covers up to 1.5m² at a 10mm thickness. Consumption rates will change based on how even the background is and suction. On-site trials are advised for the best yield indication for your specific project.
As this contains natural foamed aggregates, there may be variations in colour, texture, and shape. While these variations are minimal, when colour consistency is crucial, we strongly advise each elevation is completed using material from the same batch.
Supplied in 3.75kg polythene-lined and colour and batch-code paper bags for easy identification on-site and palletised for ease of transport, storage, and handling.
See the Technical Data and Documentation section for detailed product information, application guidance, and datasheets. Always review any available documents before use. Each project is unique, always seek professional advice before undertaking a project.
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 renders and plasters. Protect from adverse environmental conditions, including frost, rain, direct sunlight and drying winds.
Brand
Cornerstone
Binder
CL90
Coat
Insulation Layer
Colour
Off-White
Work
Rendering, Insulation
Application
Manual, Specific Sprayers
Weight
3.75kg
Aggregate
Foamed aggregate
Coverage
A 3.75kg bag covers up to 1.5m² at 10mm thickness
Yield
A 3.75kg bag yields up to 15 litres
Always read any available datasheets and documentation before use.
Please note Supertherm Plaster is an insulating layer and not a topcoat.
Stock Quantities and Lead Times
Stock quantities and lead times are estimated and may differ or increase based on the order size and shipping method. If your timeline is sensitive, get in touch with the team.
Palletforce
Pallet orders with Palletforce Economy are typically dispatched from Cornish Lime within 1-2 business days, providing your item is in stock and not made-to-order. Once dispatched, Palletforce will deliver your order within 3-5 business days, depending on your location. Please ensure that your site can accommodate articulated lorries or similar-sized vehicles.
Local Delivery
The Cornish Lime team provides local delivery with a 18-tonne vehicle with a crane to assist with unloading. You will be contacted by phone to arrange delivery and ensure your site can accommodate our vehicle.
APC Parcel Courier
Orders shipped by APC parcel courier are typically shipped the next business day and arrive within 2-3 business days, providing your item is in stock and not made-to-order. APC will contact you via email with delivery information, and orders can be tracked on the APC website.
Premium or Expedited Service
For a premium or expedited delivery service, please get in touch to discuss if this option is available for your order.
For further information, see our delivery information page.
Great Application and Performance
Alexander Mueller –