doobin
Well-known member
What does everyone do? Membrane just at the top of the stone or all around the stone?
GazCro
Well-known member
Just at the top myself.
JD450A
Feral as Fk 🐾
Teram around the lot.
Furniss
Well-known member
Do dozens of installations a year and just top.
doobin
Well-known member
2 to 1 so far in favour of just the top. Gotta say I’m leaning to all around, just to keep them lasting longer. Any more opinions?
B
bobthebuilder
Well-known member
Just the top not sudes or bottom as it will fill with fine stuff
doobin
Well-known member
You mean from the outlet? That kinda makes sense
GazCro
Well-known member
Yeah terram long term will trap fines and stop letting water through.
Gunners
Well-known member
Don't Terram the sides or bottom, the Terram clogs and is impossible to clean. At least the pipes can be jetted which will clear them and the surrounding shingle. People make this mistake with field drains too.
diggerjones
Well-known member
Not that I've used it, but you can get coils of drainage pipe wrapped in membrane
Furniss
Well-known member
The only f****ng thing I know what im on about and you dare ignore me doobin
GazCro
Well-known member
Never use coil drainage for soakaway pipework. Only use slotted sewer pipes (even the drilled sewer pipes are crap imho).
T whiting
Well-known member
I'm assuming that's because the ribs catch the silt? I take it would be fine from a biodigester though I've got one to do and I was going to use perf pipe.
It doesn't matter what you do if it's solid clay....
This is about 200t of rubble as a 'soakaway' but I think it's really a storage pit that's now full it was no tarram on the sides and only on top
GazCro
Well-known member
It is the ribs catching silt but also the perforations are v small as well (why i also don't like the drilled sewer pipes). It's also a lot easier laying rigid sewer pipes to minimal fall. I know it's possibly a small possibility but if anything were to wrong with treatment tank (not cleaned out regularly) and you were to end up with sewage down the soakaway at least you could clean slotted pipes out.
T whiting
Well-known member
I can see what your saying but a coil pipe can be cleaned with a jetter farmers do it all the time to land drains.
I layed some the other week for a soakaway pipe when I had the trench pulled it tipped down and there was a pretty good flow coming through the side of the pipe where it was turned up
I layed some the other week for a soakaway pipe when I had the trench pulled it tipped down and there was a pretty good flow coming through the side of the pipe where it was turned up
GazCro
Well-known member
I can see what you're saying but it would be better not to need to jet it at all. The only soakaways I've had to dig up and replace which hadn't been in for donkeys years have been the ones using coil drainage.
Furniss
Well-known member
I always lay slotted pipe never coiled land drain pipe - coiled goes on a trencher / trenchless etc and is fed from a roll on the machine down into the trench as you go and works brilliantly like that.
We lay at .75% to 1%..... as Gaz says can you imagine what a balls up it would be trying to lay coiled pipe to those tolerances
We lay at .75% to 1%..... as Gaz says can you imagine what a balls up it would be trying to lay coiled pipe to those tolerances
Left hooker
Well-known member
Make your own slotted pipe it's cheeper and dpm plastic on top only
doobin
Well-known member
But the dpm won’t help with allowing air down to the bacteria in the stones?!
D
DaveDCB
Well-known member
Solid slotted pipe only for soakaway! waveycoil for such applications is bad practice im afraid. Oh and clean 40mm limestone only!!
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