MDPE through Cavity Wall

[iMCaan]

Hi

 

We have an open trench for gas and electricity, which we also be using for mains water supply MDPE. The trench is well below 750mm finished ground level and beam and block floor.

To get the MDPE inside, would it be better to drill through the cavity wall into the void below the block and beam floor or above the floor?

What type of insulated ducting do I need to use and with what bend to get the MDPE inside into the garage? 

 

Thanks

 

 

[Super_Paulie]

i went under the foundations and brought it up inside into the floor void in some 110mm pipe. Used a slow bend 110mm for the bend upwards. Once into the void i used a 90 elbow to bring it back level again. I concreted the slow bend in and used fibreglass insulation and expanding foam on the entry and exit points. 

[crispy_wafer]

We went through a foundation trench block with lintel over the top.  I put 110 mm drainage pipe and pushed the mdpe through that, then shoved pipe insulation over the mdpe pipe all the way along to the bend where it comes into the build.

[iMCaan]

Thank you.

 

My builder also went through the foundation block with lintel over the top. The MDPE is in void under beam and block floor and was covered with concrete/sand mixture.  I can't remember what if any ducting he used. I suppose it's still acceptable even though it should had taken the MDPE to the utility room (right hand side of the attached photo) as per architect plans. The reason we're re-locating the MDPE is that it's short, it doesn't reach the footpath. Furthermore, Yorkshire Water want MDPE about 5 meters further away near the gas and electricity trench (see attached photo).  

 

I'm not sure that now it's practical to put a 110mm drainage pipe with lintel on top through the foundation blocks.

 

I was hoping for an insulated hockey stick, like that used for electricity cable (attached photo) as probably the best option.

[Conor]

MDPE doesn't need to be in a duct, wall thickness allows for a bit rough action. And you don't need to take the old length out, just is a coupler and bury it after pressure testing. 

[crispy_wafer]

as above, no requirement for a duct, but mine traverses 13m through the build under the B&B the duct would be useful if ever it needs to be changed.  Probably not in my lifetime though! 

[iMCaan]

Thank you