Cornerstone SuperTherm Plaster

Cornerstone Superfine Putty Finishing Plaster is a wet ready mixed finishing plaster designed for internal finishing plaster coats within an appropriate render system. Available in the colour off-white.

Engineered with precision utilising non-hydraulic mature lime putty, natural sands and chalk dust to create a high-performance superfine plaster. Made with our own premium lime putty, matured in our pits on-site for a minimum of 4 months. As a fatty lime with a high free lime content, our non-hydraulic lime putty range is more breathable, porous and flexible than our Natural Hydraulic Lime ranges.

Well-suited for projects requiring an ultra-lightweight plaster with exceptional insulating properties, with a measured K Value of 0.4, a 50mm application will improve the U value of a solid wall by more than 75%.

• Our most insulating lime plaster
• Functions as a thermal layer and basecoat plaster
• Designed to improve insulation and reduce heating costs
• Highly vapour permeable to support moisture management
• Reduces relative humidity and condensation
• Improves indoor air quality and thermal comfort
• Highly vapour permeable to support moisture management
• Can be applied at 50mm per pass as a high-build plaster
• A viable solution for Part L legislation

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 Ironstone Superfine and Ironstone Fine Finish Putty Plaster.

A 3.75kg bag yields up to 15 litres of lime render or plaster and covers up to 1.5m² at a 10mm thickness. 

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.