We need to install 50mm of insulation between the roof rafters. This will then be covered with insulated plasterboard (67mm) that is finally plastered. This will achieve a U value of around 0.2 which is pretty good for a property of this type.
The insulation arrives as 8ft x 4ft boards that need to be cut into strips. These strips are then jammed in between the rafters. The board is cut with an ordinary wood saw, but getting it to the right size can be a bit of a challenge as not all the rafters are parallel. It is a fairly messy job and the bits of polysytrene seem to get everywhere (particularly my eyes). However, I hope that we will have finished this job by the end of the weekend.
It has taken just less than a day to install the insulation in my study. We can reduce the cost of the plastering work by installing the insulation ourselves. It is relatively easy to do, but it is messy and time consuming.
There is 50mm insulation to be installed between the rafters. This arrives as a 8ft x 4ft sheet that needs to be cut into strips. The strips need to be tight so that the insulation is held in place.
Cutting the insullation boards around the new partitions is a bit time consuming (and occasionally frustrating!).