Thin insulation board for bay window

[buyingabroad]

Hi all,

We have a bay window with a flat concrete roof. Bay is probably 3 feet. Conrete is about 2 inches thick. Internal ceiling is just plaster onto this concrete.

Any ideas on how to insulate this ceiling? We will be replacing the window and will also be putting in 82.5mm insulation board throughout the house on all internal walls.

Thanks,

B.

 

[Peter C]

You could look at fitting insulation on the roof using the existing felt covering as a vapour barrier and fit a new waterproofing on top of the insulation.

 

[buyingabroad]

Thanks for the reply. Unfortunately there is no felt covering. It is just a concrete slab.

Could the insulation be done internally I wonder?