External Wall Insulation and Render

Protect your property from the elements whilst adding colour and vibrancy with our high quality and carefully crafted Stormshield External Wall Insulation and Render Systems. Whether you’re a specifier, an applicator or home owner, you will find the EWI or Render System you’re looking for.

External Wall Insulation Render

External Wall Insulation and Render

Protect your property from the elements whilst adding colour and vibrancy with our high quality and carefully crafted Stormshield External Wall Insulation and Render Systems. Whether you’re a specifier, an applicator or home owner, you will find the EWI or Render System you’re looking for.

External Wall Insulation Render

External Wall Insulation

Johnstone's External Wall Insulation systems have been specially designed and developed to provide high performance solutions to our customers. We offer a wide range of insulation materials, fixings and finish choices to make sure that the performance and the aesthetic of our systems are perfectly aligned to your needs.

EWI Explained
System durability
Installation Steps
Insulation Options
System maintenance
Technical Support

What is External Wall insulation?

In simple terms External Wall Insulation is a system of components that can be applied on the outside of a building to insulate, protect and enhance it.

We also offer a wide range of insulation materials, fixings and finish choices to make sure that the performance and the aesthetic of our systems are perfectly aligned to your needs. 

Why use External wall insulation?

Our External Wall Insulation is one of the best ways to protect a building and its residents from the elements.

Our systems insulate properties, reduce energy costs and keep inhabitants warmer.

In addition to retaining heat and providing buildings with a highly durable finish, our External Wall Insulation also offers the following benefits:

  • It eliminates cold bridges in property walls
  • It provides a new, improved look to properties in need of refurbishment
  • It pushes the dew point out to help prevent condensation and damp
  • It protects the structural fabric of buildings from the elements.

Preventing heat loss

Almost a third of all homes in the UK have been constructed with solid walls that cannot be insulated by using cavity wall insulation. In properties constructed this way a significant proportion of all heat will be lost through the walls unless they are insulated – minimising the effectiveness of other energy efficiency investments such as improved heating systems, fitting new windows or doors and insulating lofts and floors.

Typical heat loss in a solid wall property

Installing a Johnstone’s External Wall Insulation System will significantly improve the thermal efficiency of a property, reducing the money spent by residents on heating bills and reducing carbon emissions too. The diagram shows the typical heat loss in a solid wall property.

BBA Certification

A wide range of our products and systems have been stringently tested and are independently certified by the BBA, providing you with the reassurance of our construction products and systems.

30 Year expected life

Correctly applied, our Stormshield External Wall Insulation systems have a very long lifespan, particularly if they are properly maintained, easily exceeding 30 years of constant exposure in the UK climate.

Reaction to fire performance

All of the systems and insulation types we offer have been extensively tested by BRE Global for their reaction to fire performance in accordance with EN13501-1: 2007+A1: 2009 and achieve a Class B or better classification.

Should you choose mineral wool insulation on your Johnstone’s system this can be upgraded to Class A.

Comprehensive Life Cycle Maintenance Programmes

All of our External Wall Insulation specifications will be issued complete with a long-term maintenance program to extend the life of the systems and ensure they continue to look as fresh as the day they were installed.

We also offer a complete range of fully compatible repair products, Johnstone's masonry coatings and cleaning materials for all of our External Wall Insulation systems. 

Preparation:

Johnstone's Stormshield External Wall Insulation Systems must be applied to a sound, stable and level substrate. It is important that the surface is properly prepared prior to commencing work.

Protection:

Please take care to thoroughly mask and protect all areas not being rendered. Johnstone's Stormshield EWI products contain highly adhesive materials that may be difficult to remove and cause staining.

STEP1

​Apply system base tracks.

STEP2

Apply system stop, verge, & under-sill profiles.

STEP3

Apply insulation panels.

STEP4

Apply Johnstone's Stormshield render only beads.

STEP5

Apply basecoat and mesh/scrim cloth.

STEP6

Apply your choice of finish. 

The first step in choosing your Johnstone’s External Wall Insulation system is selecting the type of insulation material required. We offer a choice of four insulation types, each offering different performance characteristics across a number of criteria. Our Technical Managers are on hand to provide support and assistance, helping you to make the right choice for your project. Each of our insulation types are provided in panels measuring 1200x600mm and are available in a broad range of thicknesses to suit your project’s thermal requirements.

Kingspan Phenolic insulation

This phenolic insulation option offers strong all round performance and excels thermally.

Enhanced or grey eps insulation

This product is enhanced with graphite to improve its thermal performance over standard white EPS.

Rockwool Dual Density insulation

Rockwool mineral wool insulation offers a highly durable insulation option. This product is ideal for those applications where acoustic dampening or fire performance is a critical consideration.

Standard or white EPS Insulation

White polystyrene or EPS is easy to work with, stable and represents the most cost effective way of insulating a property.

Repairing system defects

As a regular part of maintaining any external render system, periodically identifying cracks, holes and damaged sections and correctly repairing them is essential. We offer full post installation technical support for the repair and maintenance of our systems and will make sure the right products are used.

Supporting residents and home owners

We will provide all residents of properties where External Wall Insulation or Renders have been applied with a maintenance guide.

Many system issues are caused by accidental damage caused by residents and by poor maintenance of rainwater and drainage systems.

Johnstone's stormshield masonry paints

Within the Johnstone's Trade portfolio we offer a market leading range of masonry coatings, most of which have been BBA approved, that are suitable for use over previously rendered surfaces.

These products can be applied as part of a decorative colour scheme on new work or as part of system refurbishment.

Johnstone’s extensive package of technical service sits under the banner of PPG Extra – offering comprehensive advisory and consultancy services that have been developed to guide the full spectrum of appliers, clients and specifiers through key issues including legislation, building regulations, environmental concerns, social responsibility and system choices.

Providing you with bespoke solutions

Whether it is site surveys, working from plans, system performance calculations or detailed technical support, our dedicated experts go the extra mile to provide you with bespoke solutions tailored specifically to your needs. After undertaking a comprehensive site assessment, we will provide you with a detailed project specification. Our tailored specifications include information on products, preparation requirements and application details, life expectancy and the required maintenance schedules for the selected systems, to help you plan for the future.

The complete Service offering

Johnstone's offer our customers the complete technical support package including:

  • Support in accessing funding
  • BRE approved U-Value calculations
  • Site technical visits before specifications are written
  • Full system technical specifications with bespoke detailing
  • Full pull testing and reports for fixing suitability
  • On-site technical support during works
  • Post installation inspections.

Products

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Specification tools

Using these tools, you can calculate product quantities or create a detailed specification effortlessly.

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