I've got an extension with a flat/slightly pitched roof, with a vinyl covering. There's 2 rooms, 1 has rockwool, the other has an old rigid pink insulation.
On room 1, can I leave the wool in place and add Kingspan below to increase U value? (it should still leave a few cm breathing space above the wool).
Room 2 has two layers of pink board insulation packed right into the underside of the roof (no air gap, which has been causing condensation to drip down).
Again, to increase U value, could I remove 1 layer of the old stuff and lower the remaining layer down slightly to allow a 50mm air gap above - then fit the kingspan further below, with another air gap between the pink & kingspan?
Room 1:
View media item 92090
Room 2:
View media item 92091
On room 1, can I leave the wool in place and add Kingspan below to increase U value? (it should still leave a few cm breathing space above the wool).
Room 2 has two layers of pink board insulation packed right into the underside of the roof (no air gap, which has been causing condensation to drip down).
Again, to increase U value, could I remove 1 layer of the old stuff and lower the remaining layer down slightly to allow a 50mm air gap above - then fit the kingspan further below, with another air gap between the pink & kingspan?
Room 1:
View media item 92090
Room 2:
View media item 92091