We are converting garage to an annexe. We will put 100mm Celotex over existing concrete slab and then 65mm of concrete screed over that. However the existing concrete slab has an incline from the back to the front, I presume for rain water drainage. The incline is 2 bricks height (150mm) over 5.7 metres.
I have discussed it with builder and I suggested we pour concrete over the existing slab and thus level it. He disagrees (as usual) and wants to put some sand-mix down instead (he used a name but I forget now). He thinks concrete is not necessary and is more costly.
What should I do?
I have discussed it with builder and I suggested we pour concrete over the existing slab and thus level it. He disagrees (as usual) and wants to put some sand-mix down instead (he used a name but I forget now). He thinks concrete is not necessary and is more costly.
What should I do?