R
RedHerring2
Hi, just a quickie'.
I'm about to lay a couple of courses of trench blocks for the start of the kitchen/bathroom extension. There's about 20 linear metres.
Spec' is for 100mm outer skin, 100mm inner skin & 50 mm cavity, half-filled with K8 cavity board.
I was hoping to use 255mm wide trench blocks but 275mm are much easier to obtain. Is there any problem with using 275mm blocks, just for the first two courses which will finish about 100mm below ground level?
Will the BI be OK with this?
Outer skin will then be semi-engineering bricks outer and 100mm concrete blocks inner to DPC.
I'm about to lay a couple of courses of trench blocks for the start of the kitchen/bathroom extension. There's about 20 linear metres.
Spec' is for 100mm outer skin, 100mm inner skin & 50 mm cavity, half-filled with K8 cavity board.
I was hoping to use 255mm wide trench blocks but 275mm are much easier to obtain. Is there any problem with using 275mm blocks, just for the first two courses which will finish about 100mm below ground level?
Will the BI be OK with this?
Outer skin will then be semi-engineering bricks outer and 100mm concrete blocks inner to DPC.