Is it necessary to insulate the ceiling?
Making major repairs, a private house, ceilings 2.80 m, I want to do suspended ceilings of plasterboard, and not to lose heat by putting 50mm mineral wool. Is there a feasibility of it?
It is more reasonable to insulate the floor on the attic side
The attic side is filled with slag, the house is 50 years old.
If you lower the level of the ceiling – yes, the heat will be at a different level, less cost for heating and heat storage. But are you happy with the lowered ceiling height? We're talking about a few dozen centimeters.
I plan to lower it by 10 cm. The main task of doing a suspended ceiling as the ceiling plaster lime uneven, so taking into account the height decided to level, and at the same time to insulate.
What is the ceiling made of? I would remove the slag and insulated with mineral wool. If the ceiling is wooden, you need to put a vapor barrier under the wool.
I will not remove the slag, all is dry, a layer of about 20 cm, 2 layers of board on 25, in general, there is nothing wrong. Just to use the space, and at the same time to insulate, I think the worse will not be, again, more economical will be heating. One fear was as if some kind of condensate did not accumulate there.