Firstly - what a great site! Tons of useful information for an enthusiastic amateur like myself
I've read all the info on gradients/falls and think I've got an appropriate solution for my patio project, but I'd appreciate any advice before I start laying.
My patio/path is going to be laid using textured concrete slabs around a sunroom and between the house/garage/sunroom - i.e. bordered on three sides, see sketches:
https://www.gazflo.co.uk/brewcabin/patio001.png
https://www.gazflo.co.uk/brewcabin/patio002.png
https://www.gazflo.co.uk/brewcabin/patio003.png
From the info I've read on the site, an endfall of 1:60 from house to lawn (A to H) would be advisable. I'm also considering a linear drain between patio and lawn (G to H) which would connect to existing SW drain (gutter drain) at point H, so I'd need a crossfall of 1:100.
The easiest way I can see to achieve this is to drop corner H by 90mm and keep points A, B, E, F, G level (150mm below DPC)
This would give the following gradients:
A-H = 90mm/5.5m = 1:61
G-H = 90mm/9.0m = 1:100
Hopefully this approach would minimise the "folding" required around corners C and D (I'll use 450mm slabs to help reduce lipping)
The only downside to this is that there would be a slight slope towards the sunroom F-E and no slope F-G.
I could drop corner G, but I'd have to drop H further to maintain the end and cross falls, and I'm worried that the slope A-H would be too much and cause the patio furniture to be uneven.
Should I drop corners G and H, or is my original plan sufficient?
Thanks in advance!