Upper storey internal stud walls - direct onto joists or onto ply floor?

[Hastings]

Is it better to break the floor deck (t&gOSB on posi-joists) between 2 rooms, in order to better isolate sound transmission between adjacent rooms?

 

Or lay floor as a continuous deck and build the stud partition over this?

 

2nd option quicker/easier but speed is not a priority.

 

[Dave Jones]

floor first. stud second.

[James94]

Im going to stud soon, walls will be built straight onto 22mm kaberdeck t&g. Never really thought about this, hope I’m not about to go it wrong.

regards. James

[nod]

When your putting your studs in 

Any that land parallel and between joists 

Should have noggins glued and fixed at 600 center's Directly under the floor 

 

[Dave Jones]

14 hours ago, nod said:

When your putting your studs in 

Any that land parallel and between joists 

Should have noggins glued and fixed at 600 center's Directly under the floor 

 

 

interesting, where does it spec this in the regs ?

 

[Marvin]

15 hours ago, nod said:

When your putting your studs in 

Any that land parallel and between joists 

Should have noggins glued and fixed at 600 center's Directly under the floor 

 

The stud needs good quality support and nod has said a good way to do it. 

If you rely only on the strength of the flooring between the joists it will sag over time because of the weight of the wall. I know!

Have no idea where it might stipulate this  but I have been in plenty of properties where the walls have sagged because the flooring has bowed because of this. In fact the last 3 properties!

[Hastings]

It is described in the installation guide for posi-joists. (Not that it is specific to that type of joist.)