Joists have dropped - sister joists & ply??

[dan_cup]

Hi,

 

we are going to have LVT laid on the whole hall and kitchen section incorporating the new concrete and old suspended floor.

 

our joists dip into this corner (floor boards are in a bad way as kitchen units have been on top for years) so I need to level up (sister some 5x2 onto the old joists sitting them proud?) you can see the run off from the concrete edge getting larger.

 

i will then replace the T&G with 18mm (or more?) ply glued and screwed.

 

Should I just butt upto the concrete, pass over the top so the SLC can butt upto it, or something else??

cheers

 

 

Edited 5 hours ago by dan_cup

[Nickfromwales]

If you have room for 22mm P5 boards, then do the base layer with that. Then go over with a thin layer of plywood as the binder for the LVT to go on to. Set the plywood binder to be higher than the concrete, and then feather the concrete into that with the SLC to get you snooker table flat; you need to be spot-on for LVY as it shows everything when the light is on it.

 

Yes to sistering to get the joists ready for the P5, and use glue and structural screws to do this link, inserting them at a slight angle to use the whole length of the screw. Use resin wood glue, plenty of it, to join the two together forever.

 

[Nickfromwales]

Concrete screw the last joist into the concrete floor to lock them to each other.