Extending water main pipe

[toneb]

Hi, hoping someone could give me some advice on what work is likely to be needed in this situation :

I live in a new build and my water main comes in under ground via a blue MDPE pipe from the front of the property to the back wall of the property (under sink). We are now looking to have a house extension which means this wall will be pushed back around 2.5 metres. This means of course that the water mains pipe will need extending. My question is: what option(s) are there? Could it simply be extended using a compression fitting and if so could this be buried under concrete floor?

Just want an idea of what work is likely so I can budget for it.

Many thanks in advance

 

[joni os]

Connecting to blue MDPE is relatively straight forward, make sure you use inserts, cut pipe square with blade,(not hacksaw) and be careful not to dislodge O rings when making connection. All connections should be accessible if possible but connection to water metre will in most cases be in public footpath, not relatively accessible, but rarely causing problems. Lay new pipe side to side in trench, (not in straight line),this to accommodate any future ground movement and protect with a covering of sand. Connections can be purchased either demountable or non demountable and for a connection intended to remain buried for life non demountable is my preference. If forced to make connection under building test for leakage on a monthly, six monthly and then annual basis until confident there are no issues, because water leaks can damage your foundations. With the cost of water services this leakage test is appropriate for any property you newly occupy.

 

[lame plumber]

personally, I wont make buried connections in a property, either cut into mdpe externally and run new pipe in new trench or have joint above the floor level in a cupboard to be able to access it later. either option allows you to easily rectify any leak.

 

[joni os]

If an external run is viable I would agree with lame plumber. But my experience of Talbot pushfit is so positive I would use with confidence where external run not practical. What ever the solution the most important factor is the person making the connection. Do it yourself and you can pay yourself cash.

 

[leethegasman]

All new builds I worked on the MDPE pipework was always in a 110mm pipe duct under the foundations . if this is the case in your situation extend the pipe duct to the new location in the extension you can then join the pipe work in the duct I personally would look in to electro fusion welding .any problems then in the future you can pull the pipe out from duct at front of property and pull a new one in.other option dig hole at front of property pull out old MDPE joint in front garden pull new length of MDPE to new position in extended duct.if you do not have duct ignore post.

 

[Killy Bing]

When my company has done this we have used electrofusion welding and if able to pressure tested. Thats if we haven't been able to run the pipe externally or in a duct. Ideal situation is no joints under the house.

 

[joni os]

Old enough to remember black alky before blue MDPE became the fashion. Even remember pitch fibre drains. Seen plenty of electrofusion on yellow gas but have yet to witness joining of blue MDPE by this method. Seems over elaborate when Talbot pushfit greatly exceeds strength of pipe, pipe fails by necking before fitting fails. Sorry to show my ignorance but this is one man with one pipe in one extension requiring a piece of pipe and a £5 fitting.