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Posted: Fri Feb 03, 2006 8:57 am
by jack24
Hi,
Just started an extension and need a bit of advice. The extension will be built at the rear of the property and over an existing soil pipe (clay). The builder has already broken into the existing pipe and made a few connections with plastic piping. Most of the clap pipe is under an existing path which he hasnt touched. I keep hearing horror stories about collapsed clay pipes. I'm wondering if I should get him to dig out the old pipe and relay with plastic, does anyone have an opinion on this?
Thanks
Jack
Posted: Sat Feb 04, 2006 9:54 am
by Tony McC
If it ain't broke...... 
At this stage, I'd just get a quote from your contractor to find out what sort of money would be involved in replacing the pipe, and what would be used as a replacement. That will help you make a more informed decision.
Posted: Mon Feb 06, 2006 3:45 pm
by jack24
Thanks for the reply Tony. I've asked and he would replace the pipe with plastic 110mm, but he is thinking along the same lines as you. if it ain't broke...However as a natural pessemist I am thinking, if it ever breaks I cant fix it without ripping up floors/out kitchens etc. Is there really (and I know there isnt a slightest posibility one could say yes either way without divine inspiration) much of a chance of the (30 yr old) clay pipe breaking? Do plastic ones break too? I get the feeling he (the builder) would rather not dig it up, and to be honest I'd rather he didnt either but dont want to not do it and regret it at a later stage.
Jack
Posted: Mon Feb 06, 2006 7:50 pm
by flowjoe
Most defective drains are due to poor installation (usually no specification for any type of pipe bedding) , tree roots or fracturing due to undue loading such as vehicular movement and yes the building of extensions over the top.
So you have to decide the risk for yourself, are there trees close by, have you had blockages in the past, has the drain been driven over ?. Is the drain 2.5mtrs deep or 300mm deep.
You could have a camera survey carried out to assess the current condition, but if its a straight section of drain, lets say 600mm deep for the width of a typical extension you might as well renew in plastic and have done rather then spend money on a survey up front.