R
ronnie
Guest
I'm having a two storey extension done to my house. The builder installed Kingspan board in the new cavity walls. I assumed it was being done correctly but I discovered that large lumps of masonery were left inside the cavity and therefore the insulation board is not sitting flat against the inner wall. In some places there are quite big gaps. In addition, the boards are not fitted together properly in places, and the wall ties are not put in properly in places. The result being that some of the boards are loose. In other places there are no wall ties at all, eg under the window openings, and I have been able to lift out the kingspan boards. There are no doors/windows in the extension yet, which is how I can see into the cavity in some places. The insulation is a total waste of money as it is not installed correctly and is therefore useless. I'm wondering is there anything that can be done to salvage the situation, before the walls are sealed up. I don't want to dry line the walls internally and lose the thermal mass effect of the walls.