loft insulation very small space.

[yitzak]

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?

Thanks

[Palindr☻me]

Push it into place with a broom?

[yitzak]

Sorry missed out saying - you need to leave a gap for ventilation otherwise have probs with condensation. Looking for a

[Hugo Nebula]

On 19 Mar 2006 11:50:18 -0800, a particular chimpanzee named "yitzak" randomly hit the keyboard and produced:

Not an unusual problem at all. 75mm Celotex or Kingspan between the joists. Make sure it sits down onto the plaster(board) to leave a

50mm ventilation space above.

[yitzak]

Thanks Hugo

Thats exactly what I needed - searched for "insulating board" but didn't know the magic word Celotex.

found them at

[marble]

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.