Cornerstone - SuperTherm {Basecoat}

Masons Mortar

£22.99

SuperTherm is a dry bagged, ready mixed lime insulating base coat plaster. WHAT IS IT - SuperTherm is ready mixed, ultra lightweight,low density lime plaster with fibres. WHAT DOES IT DO - Its designed to improve insulation and reduce heating costs. IDEAL FOR - It is applied to greatly enhance the thermal insulation of solid walled masonry. BENEFITS: •It is a blend of traditional and advanced materials, improving the thermal efficiency of your building, whilst respecting and preserving heritage. •Highly insulating, it has a K value of 0.04 W/mK •Very low density- 260Kg/ m³ •Reduces relative hu

Masons Mortar's own words, read from their page on 2026-09-01.

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Where this comes from

The part other shops don't tell you. Three separate questions, kept separate on purpose, each with its source.

UK company
Registered at Companies House as MASONS MORTAR LIMITED, number SC120873. Checked 2026-08-29.
Means the business is a British legal entity, not a British-sounding name owned elsewhere. It says nothing about where anything is made.
UK operations
Not yet checked.
Means people employed here, or premises they actually work from. We keep this separate from the company badge because a registered office can be an accountant's spare room, and a company can be registered in Britain while everything it does happens somewhere else. Where we have not looked, we say so rather than assuming.
Where it is made
The maker doesn't say, so neither do we.
This is about the individual product, not the company. A British firm can sell things made abroad, which is normal and not a criticism. We would rather tell you which is which than average them into a score.