OK, wondering if the practical contributors on here can help me with some calculations for laying slabs.
Basically, friend had a slabbed driveway which was supported at the edge by a brick wall, the other side of the wall being lawn. Needs to extend the driveway by two slabs for pedestrian / wheelie bin use (not for taking the weight of a car)
Here are some pictures of what I am talking about
s1112.photobucket.com/user/Bobbyg69/library/Driveway
So wall is now knocked down and taken down to a level that is below the level of the slabs. Looking to add in an extra 2 of 60x60 slabs (not the 90x60 that are on existing driveway). So this will mean cutting back the grass a bit. The height at the top of the driveway is 28cm from top of current slab to soil level.
What I am proposing to do is to cut slabs to use as the side support to hold the new slabs up between the slabs and the lawn. Cut these and lay them in with some concrete support to hold them in situ.
So I will then have a void that is currently 30cm at the top of the slope and 0cm at the bottom. The base is currently soil although you can see some of the bricks etc have been tumbled in. I therefore need to put in enough foundation to support these slabs. So what is the best way to do it?
The order I am thinking of is
a. Cut some spare slabs to reflect the slope (assume it is not possible / easy to cut slabs in a vertical position?), put these in with concrete found and leave to solidify,these then form the wall between the path and the grass.
b. Rake out the loose soil and then a layer of hard core whacked down to form a base.
c. More hard core with the brick ends etc to fill it out and then whacked down again
d. then level with type 1 ???? and then sand for laying the slabs (what type of sand?)
What quantities of each should I be looking at?
Assuming that I take another 10cm of soil away, then I am looking at a drop of 40cm at the top and about 10cm at the bottom. There will be 2 rows of 9 slabs so 60cm plus gaps wide..
It is at this point I have got onto calculating areas of triangles on the back of my hand so am I on the right track so far??
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Help with slab laying calculations!! new