Re: Re: Ambitious personal project….

As DJM said 2.4m is the min, and it is fine, but the 200mm (8in) in no harm. But if your going to go for a pre-fab timber construction for the main section (from earlier post). Then it would probably be alot cheaper to use their standard, but still look into it.

As for the floor thickness, the maxium span accross the dining room/kitchen is 5.4m. This is quite a large span and needs joists measuring 75×225. The spacing of the joists would be 300mm (with strenght class 14) or (400mm with C16). In the ground floor bedroom area, a more standard 44×225 jist can be used. You could use more shallow joist need for the short span, but it’s easier to keep ceiling heights the same.
So the floor thickness will be around 260mm including floor and ceiling.

If your updated floor plans have different spans in them let me know and i’ll revise the joists sizes.