I have a 5m x 3m brick shed that I'm in the process of upgrading, and would like some advice on replacing the concrete slab floor, which has several cracks in it and lets in the damp. The slab is separate and inside the walls, ie, the walls are not built on the slab. The walls have a DPC 2 brick rows above the slab, I'm guessing the slab did not have a DPM from the fact that damp is coming up.
I'd like to upgrade the floor, as far as I can see my options are as follows, in ascending order of ease / complexity:
1. Simply put a membrane on the existing floor and pour 4" of concrete on top of the existing slab. The shed will only be used as a pottery so not have to take heavy or industrial use. New floor level will still be below DPC in walls.
2. Break up existing slab, lay membrane on what's exposed and pour 6" of concrete in. If I do this, would I need to put sub-base of type 1 or similar down first?
3. As above but dig out and put down hardcore plus sub-base, then membrane then concrete.
The lasts sounds like overkill to me. 1 is easiest but I'm not sure about just laying one slab on top of another. With all these options are there any real benefits to putting down insulation board under the concrete? The shed is only single skinned and not heated, so will never be something you want to spend a lot of time in during the winter.
Any thoughts / comments welcome..
Thanks
Chris
I'd like to upgrade the floor, as far as I can see my options are as follows, in ascending order of ease / complexity:
1. Simply put a membrane on the existing floor and pour 4" of concrete on top of the existing slab. The shed will only be used as a pottery so not have to take heavy or industrial use. New floor level will still be below DPC in walls.
2. Break up existing slab, lay membrane on what's exposed and pour 6" of concrete in. If I do this, would I need to put sub-base of type 1 or similar down first?
3. As above but dig out and put down hardcore plus sub-base, then membrane then concrete.
The lasts sounds like overkill to me. 1 is easiest but I'm not sure about just laying one slab on top of another. With all these options are there any real benefits to putting down insulation board under the concrete? The shed is only single skinned and not heated, so will never be something you want to spend a lot of time in during the winter.
Any thoughts / comments welcome..
Thanks
Chris