External Wall Insulation – Mechanical Fix

S and B External Walls

Product Information

Expandable polystyrene boards are used as part of a render system to provide an efficient and cost-effective solution. S and B EPS external wall insulation is an accepted way of adding thermal value to the outer face of most external walls. Its versatility enables it to be used with a variety of finishes including plastic weatherboarding, cladding, tile hanging and reinforced render systems.


S and B external wall insulation, when used on the external face of a masonry wall, maximises the natural thermal capacity of the wall and assists in the reduction of thermal fluctuations. Given that heating and air conditioning interior rooms consume vast amounts of energy and also accounts for approximately 80% of total energy consumption, with 30% being lost through uninsulated walls, external wall insulation offers a highly cost effective solution to reducing your carbon footprint and money expended on climate control.


S and B offer various bespoke grades for thermal wall insulation; grades such as S and B External wall, S and B Lambdatherm® which is a grey, low thermal valued board, plus EPS 70E and EPS 200E all containing a fire retardant additive. Thermal values ranging from .038 down to .030 W/mk. Selected grades of EPS raw material are used for external wall applications to reduce any bowing and shrinkage of the EPS.

Rail System Boards:

S and B Rail system boards come in a standard dimension of 500 x 500mm ranging from 40mm up to 250mm in height. Boards are recessed and rebated on all four sides to fit a rail system that has been mechanically fixed on to an external wall.


EPS is 100% recyclable and any leftover waste we can offer a ‘Waste Recycling Scheme’ ask one of our team.


S and B EPS External Walls are available in:


EPS 100E

EPS 150E

EPS 200E

EPS 250E

Lambdatherm® 70E

Lambdatherm® Elite


  • Faster, more efficient single leaf construction can be used, creating additional internal space with improved thermal performance.
  • Lightweight materials for easy handling.
  • Its closed-cell structure inhibits water absorption and it is unaffected by the normal range of climatic conditions.
  • Unique thermal properties EPS is 98% air, therefore it is an excellent thermal insulator.
  • Green guide A+ rating

To discover more about the benefits of S and B, call today on 0191 250 0818 

Technical Information

Features Grades EPS Lambdatherm®

Thermal Conductivity

[k] value W/mk (10.C mean)

0.038 0.036 0.035 0.034 0.033 0.031 0.030

Compress Strength

kPa Min (at 10% compressivew strengths)

70 100 150 200 250 70 100

Cross Breaking Strength

kPa Min

115 150 200 250 350 115 150

Safe Working Load

kPa at 1% nominal compression

21 45 70 90 100 21 45

Vapour Diffusion Resistance

factor µ1

20-40 30-70 30-70 40-100 40-100 20-40 30-70

Vapour Permeability

omg [pa.h.m]

0.015 to 0.030 0.009 to 0.020 0.009 to 0.020 0.006 to 0.015 0.006 to 0.015 0.015 to 0.030 0.009 to 0.020

Colour Guide

Non-Responsive Table
Identification / colour coding of products manufactured to BSEN 13163
EPS 70E 2 x brown stripes & 1 red stripe      
EPS 100E 1 x black strip & 1 red stripe    
EPS 120E 2 x green stripes & 1 red stripe        
EPS 150E 1 x yellow strip & 1 red stripe          
EPS 200E 2 x black stripes & 1 red stripe        
EPS 250E 1 violet stripe & 1 red stripe          
EPS 500E 2 x black stripes & 1 red stripe        

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