When would you use treated timber for studwork?

[endecotp]

Dear Experts,

How worried would you need to be about moisture to use treated CLS timber for studwork?

I'm constructing replacement studwork for an internal wall and the lining of an external wall. It's all off a modern concrete slab which has plastic DPC under it, though the external wall is ancient and doesn't - but is very thick and shows no sign of damp anywhere. The old studwork that I took down seems to be a mixture of materials some of which may be treated. I was assuming that I would not need treated timber, but now I'm hesitating!

Any advice?

 

[oldbutnotdead]

You probably don't need treated but for the price difference you might as well bung it in. Only downside is you can't chuck the scraps in the woodburner.

 

[^woody^]

If it could potentially get damp, and/or would be difficult to replace if it needed to be, then treated timber should be used. Or if you are in the home counties or thereabouts.

 

[mrbg07546]

Or just use Cuprinol 5* on it

 

[John D v2.0]

If it is outside the heated area then use treated. If it's entirely inside, no need.

 

[endecotp]

In the end I didn't need to make a decision as the untreated was out of stock; I got treated for the untreated price.