I'm relaying 40sqM of patio (11m x 4m). The existing patio didn't show any signs of retaining water - but then again, it was laid on just sharp sand, dot and dab mortar and the house is on a hill so no problem with existing drainage on the old patio.
Now i am redoing the patio. I want to use 100mm of hardcore and 40mm of full mortar bed so I'm wondering if I need to think more about drainage?
The existing slope goes away from the house but then the bottom of the slope is enclosed on 3 sides by a retaining wall.
option 1 - is to slope towards the house and use a drainage channel (cost about £100) and send the water into the drainpipe gutter.
option 2 - dig deep at the end of the patio near retaining wall and back fill with gravel and let the water sink into the ground and underneath the patio bed.
option 3 - to run a couple of drainage pipe from the retaining wall at the under under the slabs and back towards the house drains.
Are you a tradesperson and able to answer this question?
Hello,
I think the best option is always take away the water with a drainage channel so you avoid future problems with damp in the house.
I will choose option 1 ,and it will be easier to check and clean.
Have a nice evening from vibrant garden Michele
Create a soakaway pit install a sufficient crate 3 metres away from house find the centre of your patio install an storm drain on 100mm of concrete with a sumpunit leading to the soakaway with 110mm pipe. Set the storm drain below the height of both side of the paving - flow the paving away from house to centre storm drain same on the opposing side. Creating a v in the paving. Basically having all water flow into the centre catchment system. We design these kind of systems
I think the best option would be.
option 1 - is to slope towards the house and use a drainage channel (cost about £100) and send the water into the drainpipe gutter.
As that would ensure that you the water wouldn't poodle anywhere so that's what I would do if I was laying a new patio for a customer
Option one definitely but before installation I would bucket test the drains you are tapping into, by meaning a bucket test it is fill 4-5 qty 5 litre buckets and pour them in one after another as fast as you can and if it takes it no problem at all then for the patio areas expected rainfall it should cope fine with it, also make sure you are 150mm below house damp course level and full bed the strip drains and silicone the edge to the house for a neat and weather proof seal 😁
