External wall insulation works
External Wall Insulation Works
Work in fitting the external wall insulation at the back of the house had been scheduled to begin in early December after the new windows had been fitted. However, doing this type of work is problematic in winter as the render cannot be applied in temperatures below 5 degrees. We were therefore at the mercy of the weather and with the subzero temperatures we experienced in December and January we had no choice but to postpone the work until the weather conditions had improved.
Fortunately, this didn’t result in too much inconvenience in terms of carrying out other works. The only significant delay was the new roof for the kitchen extension as this couldn’t begin until the scaffold had been taken down.
By early February the weather had improved and at last specialist EWI contractor Transcast ( http://www.transcast.org.uk) were able to start work on site. This was carried out in stages over several weekends as you can see below.
 For the project we specified a proprietary insulation cladding system supplied by Weber. The system is a render protected based on phenolic foam with a meshcloth reinforced render and textured synthetic finish. With 100mm phenolic foam insulation the calculated U value of the back wall should be around 0.18 W/m2K - that's over a tenfold improvement on its current thermal performance. Fisrt the phenolic insulation board is cut and mechanically fixed to the existing masonary substrate using special fixings. |
 The new windows were bought forward so they were flush with the exisitng wall. This detail eliminates the need to insulate the window reveals which can be problematic where the windows are set back into the wall and also helps to reduces cold bridging. |
 Once the insualtion is fixed a 6mm meshcloth reinforced render is then applied. This provides weather and impact protection. |
 Once the undercoat is dry the final finish can be applied. The textured finish is tinted to the required colour. |
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