concrete flat roof vs timber

jimmy_t

Does anyone have input on the pros and cons of timber vs concrete for a flat roof?
I know the concrete roof will have a greater depth to allow for services but any other pros or cons? The first floor is going to be a precast slab if that helps also.
Thanks.

Calahonda52

Be very difficult to sort out the thermal bridges and the insulation detailing

Dudda

Highly unlikely for a domestic house but it's possible to design the concrete roof to support an additional floor(s) in the future. We've done this for educational and hospital projects where they're always expanding over time. It's also useful for heavy plant again not really relevant for a domestic situation. The concrete roof would probably allow you to have a grass or sedum roof which if you had access and were in the city could be additional outside space.

From an insulation/thermal bridge point of view any issues can be overcome with care and foresight.

I can't see any real need for it and it's probably a considerable expense.

jimmy_t

Thanks for the replies folks.

I have talked to 2 insurance companies and they both mentioned that a concrete flat roof is considered standard construction so therefore would be easier to insure. Have you ever heard of this? Ill need to do a CBA if true!