External wall insulation Islington
In late 2015, the Be Constructive team took on a pretty challenging external wall insulation project in Islington N1, North London. The property was actually a 1950s conversion from a commercial building turned into 2 studio flats in the 1980s. The construction of the building is 220mm thick solid brick with a rather large flat roof and metallic crittall windows throughout.
Property issues before the insulation
The property, in particular the studio upstairs was suffering from penetrating damp issues through worn out brick ties on the walls. In additional due to the number of external walls the property was impossible to heat, making it extremely difficult to retain any heat. Finally the rendering and the conditioning of the brick was in desperate need of a nice touch to bring it up to standard.
Insulation works carried out
For this property, we chose the EWI Pro Mineral Wool Insulation System because of its open vapour properties and great acoustics. In the end we chose the 120mm Dual Density Rockwool finished off with 1.5mm silicone silicate render, using the full EWI Pro approved BBAdesign.
The Rockwool slabs were stuck to the walls with adhesive and mechanically fixed. The undercoat prepared with fibre glass mesh and basecoat – finished off with the 1.5mm render as the topcoat.
Minimising the silicone sealant on the job
Silicone is usually a builder’s best friend, but in this case we were asked to minimise the use on this particular project. This wasn’t a problem at all as we had brilliant ideas on how we to use other more effective solutions.
For example on the roof – instead of the usual facia boards, we incorporated brand new coping stones to cap off the roof and seal the insulation at the top to minimise water penetration.