External Wall Insulation

BEWI external wall insulation is an easy-to-install insulation that will perform for the lifetime of the building. It is compatible with all external wall systems and can be bonded or mechanically fixed to the wall.

Installing insulation on the external walls of a domestic or non-domestic property is a cost effective alternative to demolishing and rebuilding.

BEWI supplies external wall insulation in three different Thermal Conductivity Performance levels: – 0.030 W/mK, 0.032 W/mK and 0.038 W/mK to meet your specified project requirements.

 

BEWI Basetherm

         Key Benefits

  • 100% recyclable
  • Off-cut collection service
  • Can be cut to fit with a sharp knife
  • A+ rating in the BRE Green Guide to Specification
  • Lightweight and easy to handle
  • Flood proof and durable
  • Helps to achieve a high quality rendered surface

Product specification

BEWI External insulation is supplied:
In boards sized 1200 x 600 mm in thicknesses from 20mm – 200mm.
To work with BEWI BaseTherm™ board, a low moisture absorbent insulation board used as the plinth of the external wall installation.

 

Current Building Regulations
The required ‘U’ value for new insulated buildings or for a refurbishment project is below 0.30 W/m²K.

Typically BEWI External Insulation specified to a thickness 110 mm or 120 mm will achieve the required u-value of 0.30 W/m²K as part of an insulated render system on a solid wall. In addition you can specify 70 mm or 60 mm for specific areas where 90 mm is not suitable – for example in the alleys of adjoining properties.

BEWI insulation is produced to the requirements of BS EN 13163 ‘Thermal insulation products for buildings – Factory made products of expanded polystyrene (EPS) – specification’.

Thermal Resistance (R value)

The thermal resistance or R-value of External Insulation boards for the following standard thicknesses is:

Board thickness 70 E
0.038 W/mK
HP70 E
0.032 W/mK
HP+ 70E
0.030 W/mK
40mm  1.05 m²K/W  1.25 m²K/WW  1.30 m²K/W
50mm  1.30 m²K/W 1.55 m²K/W 1.65 m²K/W
60mm 1.55 m²K/W 1.85 m²K/W 2.00 m²K/W
75mm  1.95 m²K/W 2.30 m²K/W 2.50 m²K/W
80mm  2.10 m²K/W 2.50 m²K/W 2.65 m²K/W
90mm  2.35 m²K/W 2.80 m²K/W 3.00 m²K/W
100mm  2.60 m²K/W 3.10 m²K/W 3.30 m²K/W
110mm  2.85 m²K/W 3.40 m²K/W 3.65 m²K/W
120mm  3.15 m²K/W 3.75 m²K/W 4.00 m²K/W
130mm  3.40 m²K/W 4.05 m²K/W 4.30 m²K/W
150mm  3.95 m²K/W 4.65 m²K/W 5.00 m²K/W

Coverage of Boards and Packs

One BEWI External Wall Insulation board covers 0.72m². The following table shows how many boards come in one pack (depending on thickness) and the coverage of the packs.

Thickness mm  Boards per pack  m² per pack
40 15 10,80
50 12 8,64
60 10 7,20
75 8 5,76
80 7 5,04
90 6 4,32
100 6 4,32
110 5 3,60
120 5 3,60
130 4 2,88
150 4 2,88
200 3 2,16