Celotex Isover

Insulation for Rainscreen Cladding

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Ventilated façade walls (also known as rainscreen cladding walls) typically provide protection from the elements to tall steel-framed or concrete-framed buildings. Recent changes to Building Regulations mean that only non-combustible insulation or insulation of limited combustibility can be used in the external walls of relevant buildings over 18 metres in height (England & Wales) or 11 metres in height (Scotland).

The insulation of choice in these types of walls is a stone mineral wool slab installed against the sheathing board prior to the installation of the rainscreen cladding system.

Saint-Gobain Insulation UK offer a 3D calculation service for projects, this calculation is in accordance with BS EN ISO 10211 as requested by BR 443 which details methods for establishing U-values of walls with rainscreen cladding. If you have a project you wish to discuss, please contact our Specification Team.

Key Considerations

When using Celotex or ISOVER products, you need to satisfy yourself that use of the product meets all relevant national Building Regulations and guidance as well as local, national and other applicable standards relevant for your construction or application, including requirements in relation to fire and applicable height restrictions. In addition to the product datasheet, please refer to the following product documents:

Celotex products should not be used in the external walls of buildings over 18 metres in height (England and Wales) or 11 metres in height (Scotland). Recent changes to Building Regulations mean that only non-combustible insulation or insulation of limited combustibility can be used in buildings of that height.

The building detail is for illustrative purposes only. It does not constitute advice and should not be relied upon.


Insulation products
Product Name Thickness Range Sizes Lambda
ISOVER Polterm Max Plus 50-200mm Width 600mm, Length 1200mm 0.035 W/m.K
ISOVER Steel Frame Infill Batt 50-100mm Width 600mm, Length 1200mm 0.036 W/m.K