Patio drainage - What slope do i need?

[naturalnovice]

I'm a bit tight on height and wondered what was the minimum fall I could get away with on a patio? It will be about 3.5 meter wide and up against the house. I've see 1:40 mentioned and I can't get this in.

[lutonlagerlout]

depends what sort of slabs/flags you are using,if they are heavily riven you need 1:40,smoothies 1:60
otherwise you will need a linear drain ,look on the main site for details
cheers LLL

[Dave_L]

I like linear drains, they are so adaptable and can get you out of some really sticky situations - even if you are forced to lay them in fairly flat, the water goes......

We use a lot of the MEA linear stuff, City Drainage is our supplier, we use a lot in commercial situations with the steel grates.

We use the ACO drainettes for residential stuff. One tip, it does pay to shop around the prices do vary!

[wingy73]

you can get aco's with internal fall so you can lay them level:rock:

[lutonlagerlout]

you can??
i thought if you laid them level anyway the water goes to the outlet
regards LLL

[wingy73]

yes you can you been drinking to much lager lutonlagerlout,poly channel and aco ranges have monolific unit's with internal fall easily identifiable by the arrow on the side indicating flow direction

[lutonlagerlout]

yes you can you been drinking to much lager lutonlagerlout,poly channel and aco ranges have monolific unit's with internal fall easily identifiable by the arrow on the side indicating flow direction

uh oh
RTFM mate
there is no internal fall inside an aco ,if i lay 10 acos in a row and they all have 5 mm fall, how is that going to work?
the arrow is the direction of the flow,to stop seepage and to make sure they link up correctly
think,before you drink,before you type
LOL
cheers LLL :laugh:

[Tony McC]

There are linear channel with an in-built fall, but they are expensive, and you have to buy the right sequence. In simplest terms, Unit 1 has a depth at the LH end of 100mm and (say) 103mm at the RH end. Unit 2 would then be 103-106mm, Unit 3 = 106-109mm, etc, etc, etc, and to keep things simple, many of these units feature a 'direction of fall' arrow, which is similar to the 'direction of flow' arrow found on some standard linear channels.

Anyway, back to the original Q - 1:40 is excessive for most patios: aim for 1:60 (17mm per lin m)

[lutonlagerlout]

hands up i got mixed up there
but i know i am right about the acos
i bought 10 for £50 off a guy on ebay this morning and he tried the built in fall routine as well
LMAO
LLL

[seanandruby]

try a palate of birco channels with in-built falls that aren't marked. the shifting and measuring till you find the right ones is bloody hard work. i seen a guy lay some willy nilly then pour grout inside to level the invert, honest :p