How do I lay trench block on uneven chalk ground?
My plan would be to use a blinding layer of sand but I don't know if that's suitable and if it requires a wacker plate.
Background: I'm building a 4.5 * 3.3m outbuilding. Ideally with a cavity wall of dense and light block. But can scale back to dense block and wood if the foundations aren't sufficient. I've dug a 500mm wide and 500mm deep trench. At one end of the trench the depth is 100mm in a strata of chalk and on the other end it's at least 300mm.
I've got a concrete pump coming but the trench blocks are plan B if they have access issues.
My plan would be to use a blinding layer of sand but I don't know if that's suitable and if it requires a wacker plate.
Background: I'm building a 4.5 * 3.3m outbuilding. Ideally with a cavity wall of dense and light block. But can scale back to dense block and wood if the foundations aren't sufficient. I've dug a 500mm wide and 500mm deep trench. At one end of the trench the depth is 100mm in a strata of chalk and on the other end it's at least 300mm.
I've got a concrete pump coming but the trench blocks are plan B if they have access issues.