DPM internal stud junction?

[junglejim]

Argh I’m overthinking this so could do with some advice.

 Here’s a photo of my internal stud wall with dpm strips underneath. I was going to lift up the thicker black dpm and lay my floor dpm with double sided tape between the 2 but thinking now that it’s probably better to lay the floor dpm over both?

 

 I’m also unsure whether taping is needed or the overlap is sufficient?

 

 Paused mid job to think over a brew so any advice greatly appreciated. 👍☕️

 

@nod@Nickfromwales

@saveasteading

[Mr Punter]

Is the image the right way up?  Does the concrete have a DPM under?  If so I would just lay your new DPM and lap up the wall.  If not you may need double sided quality DPC taping.

[junglejim]

2 minutes ago, Mr Punter said:

Is the image the right way up?  Does the concrete have a DPM under?  If so I would just lay your new DPM and lap up the wall.  If not you may need double sided quality DPC taping.

Thanks for the reply. This is an internal stud wall on timber frame build. Raft slab. No dpm under the slab. Will lap up external walls but no bed on internal stud as within the envelope but had wondered about taping to the dpm strip under the stud. Have read that overlap alone is sufficient though hence confusion.

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[saveasteading]

Overlap is probably enough, but taping will guarantee it and keep it in place while insulating/screeding.

[junglejim]

4 minutes ago, saveasteading said:

Overlap is probably enough, but taping will guarantee it and keep it in place while insulating/screeding.

Thanks… that was my gut feeling. Do you think good above both?

[saveasteading]

Sorry I don't understand the question.

[Susie]

I taped mine up the walls and the studs.  
two layers of insulation with staggered overlaps then a thin slip sheet before the UFH.

the slip sheet is also taped up the walls my dpm is taped up more so the slip sheet is also taped to this.
can you get any insulation in the studs below screed level?  Easier to put in first and gives something to tape onto. Then maybe some noggins for the plasterboard later.

I presume you’re having UFH, all the layers you tape up the walls and studs should be neat and tight.  This gives something for the expansion foam something to stick to in the studs where there would otherwise be nothing.