Hi I'm building my extension and have got to the stage where I'm about to pour the concrete slab but have a question about the cavity fill.
I have filled upto 225mm below dpc with lean mix, construction notes say to dress dpm over inner leaf and down 150mm in cavity then across to external leaf, protect with cavity tray and fit weep vents etc.
I'm using blocks so I will have to go up a block then down a block (not 150mm) to the outer leaf, I'll be using cavity batts from that point upwards but what (if anything)goes in the gap between the lean mix fill to the dpm/cavity tray?
Hope my really long question makes sense?
Thanks in advance
I have filled upto 225mm below dpc with lean mix, construction notes say to dress dpm over inner leaf and down 150mm in cavity then across to external leaf, protect with cavity tray and fit weep vents etc.
I'm using blocks so I will have to go up a block then down a block (not 150mm) to the outer leaf, I'll be using cavity batts from that point upwards but what (if anything)goes in the gap between the lean mix fill to the dpm/cavity tray?
Hope my really long question makes sense?
Thanks in advance
)
