Stud walls - 75mm, 100mm, rough sawn, 83mmCLS?!

[Conor]

Seems the me a plethora of timber and build up options for stud walls.

 

These are for my basement - utility, bathroom and cold room, all 2400mm tall. I'm thinking 75mm rough sawn carcassing timber, possibly 12.5mm OSB*, them plasterboard etc. Any need to got to 100mm? Or is 83mm planed CLS that much easier to work with to justify the extra cost? Do these choices affect stud spacing?

 

 

 

*Used OSB in previous kitchen and bathroom renovation and made it super easy to mount stuff to walls, tempted to use it again, esp for cold room which will have loads of shelving. And beer. It's basically a big beer fridge.

 

 

Edited November 20, 2020 by Conor

[joe90]

100mm will give you a stiffer wall but is that needed?, you could get more sound insulation in as well, if required, mine are 400mm spacings with noggins/dwangs at board joins.

[dpmiller]

ours are all 89mm CLS. One consideration might be the door linings you're thinking of, standard or bespoke?

[Oz07]

Yes I think cls is either 89 or 63 wide x 38 thick. 

I used 89 here on 400c/c

Good thing about cls is it's nice and dry so less likely to warp or twist after you put it up and it dries out. 

[willbish]

If you're going to line with OSB consider metal studs. Straighter, easier, quicker...

[Conor]

Quick update on this.

 

No doors on any of these walls - they are all in the block walls in the hallway.

 

The wall for the cold room needs to be insulated - I got a pile of 100mm PIR from @dpmillerfor the job, so now settling for 100mm studs for the basement - plus the bathroom stud wall will have wall hung toilet and sink on one side, and the other side will be in the utility/plant room so likely heavy stuff will be mounted to it!

 

Local builders merchant has 100x35mm C16 timber... is this too thin? fair bit cheaper than 47mm. Both walls will be ply lined on one side.

 

Thanks

 

edit: now thinking 35mm is too narrow....

 

Edited November 23, 2020 by Conor

[dpmiller]

B&Q stock 89mm CLS but pricing's unlikely to be competitive I'd guess. None of the local usual suspects carry CLS...

[bassanclan]

35mm is too thin. Check that it is actually 100mm as they often quote a nominal size before planing.

[Gone West]

My stud walls upstairs are 89 x 38mm CLS. Only 3mm, would it make that much difference.

[Declan52]

Don't think it would make any difference going with 35mm as you are using ply and plasterboard on each side as well which will strengthen it up . 

[Mr Punter]

The OSB / ply adds loads of strength and stiffness to a wall.  Easier to fix to timber studs than metal if you have a nail gun.  You will struggle to butt join 2 sheets on a single 35mm stud if it is anything other than dead straight.

[Conor]

The builder was round today and highly recommended steel studs... Has me convinced, esp as we're nowhere near water tight.