Porch insulation/plastering felt query

8 Jan 2006
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Northern Ireland
United Kingdom
Hi ,

We have a porch with one brick wall (other neighbors porch is on the other side)
one large window, one window (with door in the middle) , and then the main door into the house.

There is no heating in this room.
We are plastering the walls (and ceiling) . currently ceiling is a wooden battens.

the ceiling we are looking to put in insulation. (as their is currently none).
The roof in the porch is sloped roof with tiles and felt on it (house built in 1984)

So looking to know , when i put insulation in the roof, is it best to put on the ceiling a breathable felt membrane or plastic sheets?, prior to the plasterer putting on the ceiling?

So it will be between the rafters, insulation, then felt/membrane/plastic sheet, then plastered ceiling
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