Hi all, We have an ex state house that has the concrete tile roof with no building paper underneath. I am wanting to make this house a bit warmer and not be losing all that heat. We do have a mixture of pinkbats and macerated paper type fill on the ceiling but during winter you can feel a bit of moisture up there and of course the wind howls through. Plenty of standing space.

My thoughts are:

Put building paper between the rafters and fix it in place with batterns running the length of the rafter and then polystyrene over that. 

Do the building paper (as above) and just sheets of ply or gib or similar to line it all.

Anyone done this before or want to chip in?

Thanks