This is the high end of my Car Port, 10° Monopitch roof. The inside is facing brick, 65mm cavity, medium dense concrete blockwork outer leaf. The bevelled wall plate has a DPC under it and is resin-bolted down. I didn't have the foresight to utilise a wide DPC to allow me to use it to close the cavity. The outer leaf is to continue up to the underside of the deck. I'll then attach a circa 100mm deep OSB fascia to the ends of the Posi joists for the single-ply membrane to turn down onto and with ventilation behind it.

 

 

 

Is it sufficient to attach a DPC to the inner vertical face of the DPC, then turn it over the cavity, landing on the outer leaf? I wouldn't want to lap it in by more than 20mm or so, because of course the final blocks needs to bond.

 

Any words of advice from the invaluable Buildhub experts?

I doubt you need to close the cavity in any case, but I would look at a Rockwool sock compressed between the wall plate and the outer leaf, resting on the wall ties.

4 hours ago, Mr Punter said:

I doubt you need to close the cavity in any case, but I would look at a Rockwool sock compressed between the wall plate and the outer leaf, resting on the wall ties.

 

Can I just use cavity batts cut down in the same way do you think? Or must they been sleeved for some reason?

 

I guess something is needed to stop anything going down there, birds etc. Not that I can imagine how they'd get in once its finished.

I was thinking the same as @Mr Punter why do you need to close it?

1 hour ago, Oz07 said:

I was thinking the same as @Mr Punter why do you need to close it?

 

Maybe I'm overthinking it, it's normal for me. 🤣

Insulation going in there? 

 

Looks like an opportunity pour in some EPS beads.