Hi Folks, Just a meddling amateur here. Was wondering about the best practice for laying a patio between two external walls that sit at a 90 degree angle to each other. Patio will only be about 4x3 metres. Was thinking it through and realised I might have to make a slope in two directions to avoid shedding water to the end of one wall or another. Old stone cottage in Scotland exposed to the west so susceptible to deluge. Of course, 200 years old so no DPC either - not sure what considerations on that front. Anyway, DPC aside, is there a best practice for the slope, involving multiple angles? Or could I just have a single run across the diagonal from where the two walls meet to the opposite corner? Any advice kindly received!