Hi all I'm helping a mate do a side extension and on the plans it says we need to weak mix in the cavity up to dpc level (is this 150mm or 225mm?) Also am I right in saying the weak mix should be about 8:1 quite wet? The bricks/block work to dpc should be wall tied aswell shouldn't they with no insulation just weak mix? Sorry for the dumb questions just want to be certain of a few things before helping from dpc up it is pretty straight forward.
???????, up to DPC in the cavity. Any muck in the cavity should not be higher than 150mm below DPC. Ties are normal set directly on top of the DPC the stop insulation bats dropping below DPC.
The plans say that there should be weak mix put in cavity to dpc. So I assume that means up to 150mm below DPC? What do you mean stop insulation bats?
Cheers mate that helps alot build up fill cavity to 150mm beneath dpc level then start with the wall ties and insulation.
I believe it is 5 courses so should be fine, will I need to use a cavity tray? Or will I be okie if i just put a slope towards the external brickwork? And last but not least going back a few years since I done bricking lol, is it every 5 or 6 courses a tie should be used and it's every 3/4 bricks isn't it? Thanks for your help aswell top bloke