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Posted: Wed Oct 13, 2010 3:17 pm
by bert
ive got a 27 meter run with two 90 bends in it , its a combined toilet , bath and basin with one rainwater all running into a sewer.
what would the total fall be that i need guys? do the 90 bends make a difference?
ive got 550 mm to play with from toilet position to man hole, is this too tight?
Posted: Wed Oct 13, 2010 6:26 pm
by mickg
by my reckoning with your distance of 27 metres and 550mm depth to play with the fall is 1:48.63
you needed 668.65mm depth so your fall is 4.394mm per metre in length less than it should be at 1:40 (thats 1 inch fall for every 40 inch of length) for a foul drain so yeah its tight on fall but with modern day plastic pipe and push fittings it should not be a problem
Disclaimer
no liability is accepted for the above comment ???
make sure you use the correct lubrication and to chamfer any cut lengths of pipe so you don't damage the rubber seal when you push the pipe into the bends or straight connectors
I have seen many a salt glazed pipe not properly jointed and cleaned off with a richard the third stuck on the snot of mortar, if plastic underground drainage is install correctly then this is a thing of the past 
Posted: Wed Oct 13, 2010 7:01 pm
by lutonlagerlout
bert no building inspector will pass a foul run with 90 deg bends in it
if you have to turn 90 deg they want an inspection chamber
plus with a 27m run it would be prudent to have a couple of ICs
these would do the trick
LLL
Posted: Wed Oct 13, 2010 7:02 pm
by GB_Groundworks
Most bco will let you get away with less fall if the run is in 150mm but must convert between 110mm and 150mm within an ic or man hole,
On your 90 you will need to use the 330mm 90 degree inspection chambers for any change of direction
Haha my boy was pestering to play monkey lunch box on my iPad as I typed that haha or I'd have beat you lol.
I'd get a level as well either laser or automatic level to confirm your falls
Edited By GB_Groundworks on 1286993159
Posted: Wed Oct 13, 2010 7:17 pm
by lutonlagerlout
if you snooze you lose!
LLL :;):
Edited By lutonlagerlout on 1286993865
Posted: Wed Oct 13, 2010 7:35 pm
by bert
thanks guys , i used string and a 1 meter level so my measurements wont be perfect but i can raise the floor level a bit if i have to to compensate.
i probably wont be doing the work my self , well that is if i can afford to pay someone to do it for me. any ideas of how much a job like this would cost?
also , if the room was a bathroom before the renovation work but it didnt have a wc in there would i need a change of use planning application? or would it be best just not to tell anyone? :;):
Posted: Wed Oct 13, 2010 8:08 pm
by flowjoe
:;):