So, first post here - hello!
A bit of background: I'm having a large prefab garage built (4.4m wide, 11.6m long), the only prerequisite being that I have a prepared flat base for them to build it on. Of course, the ground work and base is where all the money goes....
I've had an architect involved who has been engaging with Building Control and a structural engineer for me, and I have a builder who is going to do the shuttering and concrete pour (I really don't want that to go wrong, and if it does, I want someone else to be responsible!!)
The garden has a steady fall along the length of the new garage of about 600mm over the 11.6 m length. The ground is chalk, then sandy clay with flint. The engineer suggested either strip footings or mass fill. We've gone for mass fill. The engineer speced that no hardcore subbase was required, but that the top 150mm of organic material should be scrappled back and then the base poured on top of that. My builder prefered the idea of a subbase, as did I, and besides I need to get rid of the old garage, so we've gone down 300mm and will put down 150mm of subbase, blinding sand, DPM and then the pour.
The bed is now all dug out and squared off and I have a crusher coming in the next day or two to crush the old garage and base.
So, some questions:
Does it matter what sand I use for blinding, or will the cheapest be fine?
How thick should the blinding layer be?
How small should I crush my hardcore?
A bit of background: I'm having a large prefab garage built (4.4m wide, 11.6m long), the only prerequisite being that I have a prepared flat base for them to build it on. Of course, the ground work and base is where all the money goes....
I've had an architect involved who has been engaging with Building Control and a structural engineer for me, and I have a builder who is going to do the shuttering and concrete pour (I really don't want that to go wrong, and if it does, I want someone else to be responsible!!)
The garden has a steady fall along the length of the new garage of about 600mm over the 11.6 m length. The ground is chalk, then sandy clay with flint. The engineer suggested either strip footings or mass fill. We've gone for mass fill. The engineer speced that no hardcore subbase was required, but that the top 150mm of organic material should be scrappled back and then the base poured on top of that. My builder prefered the idea of a subbase, as did I, and besides I need to get rid of the old garage, so we've gone down 300mm and will put down 150mm of subbase, blinding sand, DPM and then the pour.
The bed is now all dug out and squared off and I have a crusher coming in the next day or two to crush the old garage and base.
So, some questions:
Does it matter what sand I use for blinding, or will the cheapest be fine?
How thick should the blinding layer be?
How small should I crush my hardcore?
