useful comments from a few I don't think. I've provided info in the text and as "experts" in this field I would have thought id get some good feedback not sarcastic comments such as the above. I've been in building for a very long time, I'm not an idiot and I demand good workmanship for me and my customer. Will wait for further sarcastic comments on that. They also, according to the manufacturer of the pipe they laid, used the wrong pipe for the job. It will be ok and do the job but its way too inflexible for the installation they have fixed in hence the pipes on the bends, which were laid in at way too tight, have had to be stamped down with the foot, have squashed the castellation's and the pipes being too inflexible will not sit down flat and are sticking up . Still a good job is it? Also found a very nice neat Stanley blade cut in my membrane following exactly the edge of the plastic mating showing that they cut this flat on the floor on my protective membrane ! No attention to detail, no care taken, shoddy job. However thanks to all those that tried to help