Rockwool – New RockShell Wall System

Rockwool, the world’s largest producer of stonewool, has launched a new exterior load bearing wall system which integrates high levels of insulation into its design to deliver an energy efficient solution to the Zero Carbon challenge – while keeping wall thickness to a minimum.

Passivhaus certified, the system achieves a typical U-Value of 0.143W/m2K, making it an ideal specification for projects targeting superior thermal performance or higher levels of the Code for Sustainable Homes.

RockShell is delivered to site in ‘kit form’ according to the specified building design. Constructed of I-shaped steel profiles encompassed in heavy Rockwool insulation and an OSB lining on the inside, RockShell is quick and easy to install and requires no specialist equipment. Matthew Bromley, UK Business Manager for the RockShell Wall System, explains: “In simple terms, RockShell takes the insulation that would traditionally be used for wall cavity insulation and turns it into part of the load bearing structure. In doing so, far superior levels of thermal performance can be achieved without increasing wall thickness. From a compliance perspective, system performance has already been proven with Passivhaus certification.”

Suitable for buildings up to two and a half storeys and with most types of foundation, RockShell has also been designed to offer maximum flexibility in building design and simplicity of installation. For example, the system interfaces with many common building components while the exterior can accept most types of finish, such as render and cladding.

Rockwool has underpinned the launch of RockShell with comprehensive technical support, which includes a detailed building manual, access to the local technical team for specification guidance and project meetings as well as a free design service.  For further information on the RockShell wall system please visit or email