Floor prep for screed inbetween joists - TilersForums.com

[Flintstone]

I think we have a plan. Build a dwarf wall to support the joists mid way. Fit the ufh and screed to to top of joists. Board the over with 22mm giffa cement board screwed to joists, then bring new screed flush to that. Anti fracture mat the whole floor and honour the joint between the two

 

[Dumbo]

I like the sound of that, nothing like a good bit of structure .