Why External Wall Insulation System?

The specifying of a PermaRock external wall insulation system will provide many benefits to an architect or specifier, including how systems help improve thermal performance and can contribute to achieving low air permeability of the building envelope, limit thermal bridging and provide an extensive range of decorative renders and finishes: 

Building Regulations 

System Certification

With over 40 years’ experience of supplying into the UK’s construction sector, PermaRock has been at the forefront of external wall insulation (EWI) development in the UK, obtaining the first British Board of Agrément (BBA) and Building Research Establishment (BRE) accredited external wall insulation systems.

Our commitment to delivering the highest quality systems with the very best in terms of technical performance is reflected in our continued investment in testing to relevant UK / European Standards and certification of our external wall insulation systems. PermaRock systems include third-party certification through the Building Research Establishment (BRE) Global Certification Service (Cert No. 158/12), which is recognised under the Building Regulations for England and Wales, Scotland and other European Standard organisations.

Construction Types

PermaRock systems carry independent accreditation which confirms their suitability for application onto timber and steel frame buildings, in addition to concrete and masonry construction. Our drained cavity systems are also available to meet the requirements of NHBC, Trada, Zurich and other buildings insurers who prescribe the inclusion of a drained cavity into the system on frame constructions.

Fire-safe Solutions

One of the major considerations for specifiers, when choosing materials for building façades, is the fire performance of the building envelope components. Particularly important is the performance on high rise, multi-storey residential and public buildings. 

For use on multi-storey buildings, the PermaRock Mineral Fibre external wall insulation (EWI) systems provide excellent reaction to fire performance, and systems with an A2-s1,d0 classification in accordance with BS EN 13501-1:2007+A1:2009 are suited for use on high rise and low rise buildings including those with floor levels above 11 metres above ground level. PermaRock Mineral Fibre systems with PermaRock SiliconeUltra K FinishMineral K FinishPermaRock Brick SlipsPermaRock Brick Effect Render and Dry Dash Finish assessed to EN 13501-1:2007 + A1:2009 and are classed A2-s1,d0.

Aesthetic Inspiration

With an extensive range of decorative renders and finishes available, PermaRock provides seemingly endless scope to create exciting and inspiring buildings that can compliment and contrast with other cladding materials such as timber, stone, glass and metal.

Whether you choose from our outstanding palette of over 1300 colour shades available with our textured through-coloured renders, scratch renders or our synthetic brick slips, we provide unprecedented freedom to create uniquely expressive façades.

Further dramatic shape and form can be created through simulated blockwork, shadowlines, ashlar effects and architectural profiles to add further expression.

Find out more about our range of renders and finishes

Thermal Performance

External wall insulation systems can easily be designed to help meet current limiting fabric parameters (U-value and air permeability), outlined in the existing Part L Building Regulations, and will also comfortably meet the increased requirements proposed within Part L Building Regulations in England (April 2014).

Fabric U-values, quoted for new buildings in dwellings and non-dwellings, show that a fabric first approach remains critical with the improvements required for new thermal elements and when upgrading retained thermal elements on existing buildings. The increased focus on lowering U-values emphasises the benefits of using PermaRock external wall insulation which can contribute to key requirements such as achieving low air permeability of the building envelope and limiting thermal bridging.

Systems can also be integrated into the design of a building making a meaningful contribution to attaining a high SAP rating.

Low / Zero Carbon Buildings

Incorporating PermaRock external wall insulation into a building envelope design can be a significant aid in achieving the improved energy standards of the Passivhaus, BREEAM and other standards where sustainable and low carbon design standards are described.

PermaRock external wall insulation can significantly reduce cold bridges in walls and help to deliver U-values of 0.15 W/m2K and below. Furthermore, systems can be designed to produce an extremely airtight façade, limiting any thermal bridging or unnecessary heat loss through the building envelope, a very important factor if the goal is to achieve a low energy / zero carbon building.

Find out more about specifying our systems on low carbon buildings


“…PermaRock provides seemingly endless scope to create exciting and inspiring buildings that can compliment and contrast with other cladding materials such as timber, stone, glass and metal.”

Also In This Section

Colour & Sample Selector

Use our innovative and easy-to-use colour and sample selector to view, choose and finalise your colour selections. You can view our entire range of decorative renders and finishes and ordering samples couldn't be easier.

Low Carbon Buildings / Sustainable Products

Working closely with building designers, PermaRock can advise from design stage through to installation on how the external wall insulation element of a project can meet low carbon design requirements and contribute to or...
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