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Patio drainage


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easyram
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Joined: 26 Oct 2010
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PostPosted: Wed Oct 19, 2011 10:45 pm    Post subject: Patio drainage Reply with quote

How to and what kind of drainage should I put on a patio area closed with retaining walls (from three sides and the house from the fourth side with access near the house on both sides)? I know I have to put some drainage on the outsides of the walls but what about the paved area? And how much should the paving slope if it's 8m wide and 14 m long? 2%?
The patio is going to have quite difficult shape - not just square but with couple of curves.

Thank you!
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Sunny
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PostPosted: Fri Oct 21, 2011 12:17 pm    Post subject: Reply with quote

Stick up some photos
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easyram
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Location: Limerick, Castletroy

PostPosted: Fri Oct 21, 2011 12:24 pm    Post subject: Reply with quote

There is no photos yet! It's just a project. Even the house is not finished... I just need to know some theory in a case where you have a patio lower than the ground around.
Maybe I'll try to draw it and post the drawing...
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ponddigger
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PostPosted: Fri Oct 21, 2011 12:44 pm    Post subject: Reply with quote

hi easyram.you could build some dry stone walls to keep clay back Very Happy ponddigger Very Happy


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ponddigger
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PostPosted: Fri Oct 21, 2011 12:51 pm    Post subject: Reply with quote

sorry easy read your post wrong,you should put a drainage pipe under the patio,and connected to your waste water manhole Very Happy ponddigger Very Happy
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easyram
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PostPosted: Fri Oct 21, 2011 1:06 pm    Post subject: Reply with quote

Just like that ponddigger? Just one pipe? I'm worried that the rain water from the surrounding area will put some pressure on the walls and also the house will get some water from the paved area. I will post some drawings later today to explain exactly what I mean.
Thanks!
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walltoall
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PostPosted: Fri Oct 21, 2011 4:33 pm    Post subject: Patio drainage Reply with quote

My patio consists of 450 x 450 standard slabs. It runs the 10m length of the house and is 6 slabs wide. I asked the builder to lay the course nearest the house on sand and the rest on a concrete hardcore base and pointed. There is no fall as I reckoned the water would find it's own way into the ground. My idea was to allow rain water to have access to the house foundations along the whole length of the house, which is built on London clay. It has worked very well, in spite of the builder's initial scepticism. The patio level is nominally the same as the garden and 4" below the damp-proof course of the house. If I were doing your size (which is about the size of my whole garden) I should use the same idea and have a pattern of sand-based single tiles arranged across the area. Maybe every fourth or fifth slab in each direction and no fall because I would not want all the water to pour off one end. This would allow the drainage to be directly into the ground, thereby preventing drying out and subsidence of the ground under such a large area. Just my idea by the way and I'm known for oddball approaches to life. lol
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easyram
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PostPosted: Fri Oct 21, 2011 6:25 pm    Post subject: Reply with quote

walltoall that sound quite simple yet reasonable but my biggest problem is the retaining wall around the patio and the fact that all behind is on higher level and also there's some wet land further behind. So all excess rain water will come down and reach the patio so I need to be sure the house and the patio are dry.
Wait for my drawings please! I'm just working on them.
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easyram
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PostPosted: Fri Oct 21, 2011 6:44 pm    Post subject: Reply with quote

OK here it is.
So the drainage that I plan to put is marked in red.
Also the ground for patio would be prepared properly - gravel, sand etc.

What you think???

Thanks!



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ponddigger
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PostPosted: Fri Oct 21, 2011 9:07 pm    Post subject: Reply with quote

hi easyram ,nice design.you could use a pump in a sump hole to pump any exess waterfrom the grate drain,most septic tanks work this way Very Happy ponddigger Very Happy
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easyram
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PostPosted: Fri Oct 21, 2011 9:28 pm    Post subject: Reply with quote

Hi ponddigger,
Thank you Smile
Do you suggest that I will need a pump??? Is the system I designed not enough? The water is going to be lead off to the main drainage pipe and away from the plot.
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ponddigger
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PostPosted: Fri Oct 21, 2011 10:12 pm    Post subject: Reply with quote

hi easyram,is there a fall on the patio Very Happy ponddigger Very Happy
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easyram
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PostPosted: Fri Oct 21, 2011 10:50 pm    Post subject: Reply with quote

Hi ponddigger. Well that's the question... I suppose there should be but what way? I think that the safest option for the house would be to create a fall from the house towards the retaining walls and also at the right side of the patio towards the main drainage pipe. Hence I put trenches along the inside of the walls and on the right hand side.
Does it make sense?
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ponddigger
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PostPosted: Sat Oct 22, 2011 7:24 am    Post subject: Reply with quote

hi easyram,any patio i ever built i always put the fall away from the house,i like your idea of the drain where the patio meets the retaining wall Very Happy ponddigger Very Happy
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kindredspirit
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PostPosted: Sat Oct 22, 2011 9:13 am    Post subject: Reply with quote

Hi Easyram,

You just need the slightest of slightest falls for water to follow.

I couldn't argue with your plan: perhaps I would put a second pipe from the patio boundary walls to join your planned discharge pipe on the right. That would make for less water getting near the house. And maybe, a little inspection manhole cover at their intersection. You can buy those from hardware places.

I like your design. Looking forward to seeing photos of the finished project.

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