DPC behind timber battens on wall?

[OldieNewbie]

Hello all, 

 

I asked this question in another forum earlier but I thought I would put here as well for more opinions. Apologies to mods for double post if it is an issue. 
 

In anyway, If your batting out a wall with 2’ x 2’ should you also have a strip of DPC behind them? Or if the wall is sealed first with a coat of sand and cement would that do rather than the DPC?

 

Or is it totally decided by designers? 

[nod]

Same answer as before 

[OldieNewbie]

25 minutes ago, nod said:

Same answer as before 

Why is it used?

 

if not used would you be concerned? 
 

is there ever a reason it does not need to be used

[Mr Punter]

If it is a solid external wall with no DPC, then yes.  If the wall is completely dry and has a DPC and a cavity then no.  Other situations will be maybe.

[OldieNewbie]

11 hours ago, Mr Punter said:

If it is a solid external wall with no DPC, then yes.  If the wall is completely dry and has a DPC and a cavity then no.  Other situations will be maybe.

Thank you. 
 

When you say if it’s an external wall with no DPC do you mean the DPC that is laid to stop rising damp? Is that the no DPC?