I've got 700mm of concrete in the ground for single storey extension.
Thought I was okay to build up from the concrete a cavity wall using standard 100mm Celcon blocks (3.6n) 2 courses inner skin and 1 course + 3 of face bricks to outer skin with weak concrete infill to DPC – thought I'd asked Celcon Tech Dept about this but not sure now (and of course they're closed now for w/end).
A builder just said he hadn't seen them used like that before, he always uses the heavy blocks which has got be concerned.
Thought I was okay to build up from the concrete a cavity wall using standard 100mm Celcon blocks (3.6n) 2 courses inner skin and 1 course + 3 of face bricks to outer skin with weak concrete infill to DPC – thought I'd asked Celcon Tech Dept about this but not sure now (and of course they're closed now for w/end).
A builder just said he hadn't seen them used like that before, he always uses the heavy blocks which has got be concerned.