Stone wool manufacturing
A1 Fire Rated — Euroclass A1 Non-Combustible

A1 fire-rated stone wool insulation, made for cladding

Thermawool delivers premium A1 non-combustible stone wool insulation solutions engineered for modern cladding applications — outstanding fire, thermal and acoustic performance.

Precision cut
A1 Fire Rated — Euroclass A1 Non-Combustible

Stone wool precision-cut for modern construction

State-of-the-art manufacturing ensures every Thermawool product meets the most demanding technical specifications — delivering consistent performance on every project.

Delivery
A1 Fire Rated — Euroclass A1 Non-Combustible

Where the power of natural stone meets comfort

From the factory to your project site, Thermawool delivers premium stone wool insulation to projects across the United Kingdom — supporting every stage of your build.

A1 Fire Rated — Euroclass A1 Non-Combustible
A1 Fire Rated
Euroclass A1 · Non-combustible
Superior Thermal Performance
λ 0.035 W/mK · supports Part L
Acoustic Comfort
Excellent sound absorption
100% Recyclable
Naturally sustainable
What we offer

Stone Wool Solutions for Every Application

From technical specifications to project delivery, Thermawool supports every stage of your build with premium A1-rated stone wool products and expert guidance.

The Thermawool Range

Seven products.
One uncompromising standard.

Every Thermawool board is Euroclass A1 non-combustible — precision-manufactured stone wool engineered for the most demanding cladding and floor specifications. Browse the full range below.

RAINCLAD
A1 Fire Rated — Euroclass A1 Non-Combustible

RAINCLAD®

External Wall · Rainscreen Cladding

A high-performance, non-combustible stone wool insulation board for ventilated rainscreen façade and external cladding systems. Manufactured from natural volcanic basalt, it delivers reliable thermal performance (λ 0.035 W/mK), Euroclass A1 fire resistance and effective acoustic absorption on buildings of any height — including over 18 m.

60 kg/m³
Nominal density
λ 0.035
W/mK conductivity
50–225 mm
Thickness range
Need technical support for your project?Our team of technical experts is ready to help you specify the right solution.
Contact our team