Specifying External Wall Insulation Systems

We understand that it can be a complex process specifying the most suitable external wall insulation system and that many factors can influence system choice and the decorative finish proposed.

Our technical representatives provide detailed design and technical assistance and with early engagement in the design process, we can advise on system selection and produce specifications that are closely tailored to the individual project requirements.

This provides opportunities for cost reductions associated with time and material waste whilst maximising value for money and maintaining the highest quality standards.

PermaRock offer systems based on a range of modern insulation materials that include non-combustible mineral fibre, lightweight expanded polystyrene, enhanced expanded polystyrene and high-performance phenolic foam.

These systems have been designed to enable various methods of fixing to be employed, depending on the substrate condition and type i.e. blockwork/masonry/timber frame/lightweight metal frame/structural building systems.

When choosing a system, designers and specifiers must ensure that the following factors are taken into consideration to ensure the best solution for the project is adopted:

  • Type of Building/Wall Build-Up: system type should be chosen to suit the wall construction, type of building, design loads, and structural movement, etc.
  • Fire Performance: the system should be suitable for building use, low rise and/or high-rise application, as appropriate, and where required, should incorporate fire performance or fire-breaks to meet with Building Regulations and achieve A2-s1,d0 classification in accordance with BS EN 13501-1:2007+A1:2009.
  • Thermal Performance: what is the required U-value of the building envelope or SAP rating requirement? Are there limitations to the thickness (zone) of system which can be accommodated?
  • Aesthetics: is the desired type and colour of decorative finish available and suitable for the design and its intended location and exposure? 
  • Detailing and Interfaces: full consideration needs to be given to the interface with other materials and how the system is protected at edges, overhangs and abutments. 
  • Impact Resistance: the decorative finish may be selected primarily on the desired aesthetic appearance but must also take into consideration the level of impact resistance required. 
  • Cost: a number of design factors can have an effect on the cost of the system, including, insulation type and thickness as well as the selection of decorative finishes and fixing methods.
  • Exposure of Site: resistance to wind and impact loads, high / low traffic, local pollutants (e.g roads / railways), etc. may need to be considered for system and finish selection.

All our systems are complemented by an extensive range of renders and decorative finishes including acrylic and silicone based textured renders, brick finishes and scratch renders.

PermaRock systems listed on NBS Plus /
RIBA Product Selector

You can find PermaRock external wall insulation and render systems on RIBA Product Selector and NBS Plus, enabling specifiers to source products and generate specifications for our products.

 View our RIBA Product Selector company page or visit our Technical Hub where NBS Plus and BIM Objects are also listed.

 Our  Technical Hub includes easily accessible and up-to-date information on our products (systems) and specification tools:-

  • Building Information Modelling (BIM) Objects

  • Company Approvals, Memberships & Certificates

  • Literature (External Wall Insulation / Render Systems)

  • Material Safety Data Sheets (MSDS) - System Components

  • Registered Installer Application

  • Sample Selector / Colour Viewer

  • Seminar Request

  • Specifications (Systems) - M20 + M21 NBS Plus

  • Standard Detail Drawings (CAD)

  • System (Product) Accreditation

  • Technical Datasheets (System Components)

  • U-Value Calculation Request

We’re here to help

One of the most valuable benefits of specifying a PermaRock system is the knowledge that there is an extensive level of support provided alongside our products.

 If you can’t find the information you require or wish to speak to our Technical / Sales teams we are always on hand to offer practical and experienced support, call us on 01509 262924 or email [email protected].

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