Hi have an odd problem.
The ceiling of the room directly under the roof is level half way
across then slops downwards.
E.G. the ceiling is about 2.5 metres high for half the room then slops
down to about 2m.
Looking in the loft above this room;
The sloping part - there is literally only 12 cm gap between the
plasterboard ceiling and roof felt.
I can easily put normal insulation above 2.5m high section cos there is
almost 1m clearance between joists and roof felt. But what can do for
the ceiling part that slopes downwards?
Use Celotex, but it needs to be kept pressed against the plaster board
ie with no draft on the warm side. The best way is to pull down the
ceiling and use nails hammered into the sides of the rafters to hold
it in place. Squirt some expanidng foam into the gaps and thatll hold
it in place. Re-board with foil backed plaster board.
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