Patio drainage - Pipe coverage/protection

[Mikey_C]

below is the overall view from the back door of the "to be" installed patio. due to get the fall there is going to have to be a small step up to the lawn. because i can't drain straight on to the lawn, i have to collect the water in linear drain and connect it to the soakaway pipe you can see to left of the photo. the next post shows a close up of this pipe and will contain my actual question.....

[Mikey_C]

the linear drain is going to run down from the top of the photo over the pipe to a trap, then get connected up to the pipe. my question is where the linear drain is running the will be a flag on edge to retain the lawn, this will be bedded on 4" of crete and have a subatial lump of mass crete behind it as per (tonys flag on edge page)
do i need to protect the pipe from concrete running across it and if so how by concreting in all the pipe and trap? putting a lintel of the whole lot and working off that?

[Mikey_C]

finally at the other end of the retaining run I have another pipe i was just going to cover this one with a bs edger laid flat and bedded on crete, is this ok? over the top? not good enough should be using a lintel?

[mickg]

the flag its self will act as a lintol and will span over the drain and use either 50mm polystyrene or 50mm of sand to the top and side of the pipe so the concrete bed and haunching can't apply any pressure directly onto the drain

[Mikey_C]

if i can't get 50mm of coverage or there is a joint right over the pipe is that a problem?

[mickg]

the 50mm is in case of any movement either in the ground or the vertical flag itself and would normally apply to a larger job, (not that i am saying your patio is not a large job Mikey)

25mm would be enough to allow for any movement, 50mm is just making sure there is adequate space allowing for any compression when you place the concrete bed on top

so long as the flag and concrete bed is not in contact with the pipe it should not cause any problems in the future, if the bottom edge of the flag will be touching the pipe or in near contact then you will have to notch the flag accordingly with a series of cuts 20mm - 30mm apart to the desired width and depth and tap lightly with a hammer to remove

[Mikey_C]

Thanks Mick.

[Mikey_C]

in the words of gordon ramsey, patio drainage DONE.

[Mikey_C]

second photo

[lutonlagerlout]

I dont wish to hiss on your bonfire mikey,but i laid a patio where the guy had installed those placcy fin drain things ,
lemme see about a year ago
and they are blocked now
looks pro what you have done ===> fair play
how much fall are ye intending to have away from the house?
LLL

[mickg]

looks like Mikey has installed the rodding outlet on the left hand side Luton, first photo showing the excellent installation of the drainage channels and not skimping on the concrete haunching either

Nice job mikey

[lutonlagerlout]

so where will it rod to?
if i rod a drain i generally need 2 points of access to remove the detritus
i think i am biased towards aco drains as a timeless product,easy to install and retain their looks
for me personally plastic looks incongruous on a patio
cheers LLL

[mickg]

I was talking to the Aco rep on the stand at world of paving and he showed me the complete kit for this type of drain as I voiced my concerns on rodding once the slot type channel was installed, builders merchants don't stock this raising piece so I had not seen one

basically all it is is a rising piece what clips on top of a 90 degree corner which then butts to the end of the drainage channel, remove the square top and push your drain rods down...simple really

i personally like the plastic more than the shiny galvanised gratings what glints in your eyes on a sunny day until its been installed for a couple of years and then goes dull starts to rust ???

[Mikey_C]

mick is absolutely right there is a full square access/roding point at the lower end. sits right above the trap, should you want to shove your hand/gully cleaning thing/suction device down there. it may have been a thought to add a second at the other end, even if it the outlet was left closed off.

the patio has got a good 1:60 fall with the drain set down another 15-20mm.

i didn't want to install the full with the black plastic/metal acos as, it was bad enough having to install the step between patio and lawn, the whole garden had been dug over and levelled last year only for the turf to take up a great depth than the supplier suggested and the wife to extend the patio.

I am certainly not ripping up what I have put down to replace it, i shall look into putting a second access point down the t'other end.

[lutonlagerlout]

I'll get me coat
:;):
LLL