Running water main externally in a sleeve

[mutley racers]

Has anyone done this?

I need to get a supply from the kitchen to an unvented cylinder on the 1st floor. Only way really is out under the sink, around the sid of the building and up the wall into the airing cupboard.

What's the easiest way to run this pipe in a waste pipe insulated?

Cheers

 

[mutley racers]

Thinking if you ran it in soil pipe then properly insulated in


If going external, then you need to consider sufficient insulation to minimise warming and maximise frost protection. Unfortunately, its unlikely that a nitrile based insulation will do both jobs. The reason for that is you need thick insulation to minimise warming but thinner insulation coupled with trace heating to protect against frost.

The best insulation for this job is the rockwall stuff wrapped in reinforced silver foil. Unlike any of the plastic stuff, it does NOT shrink at 4 degrees C. That comes in 1m lengths so you can slide it into soil pipe and I believe that would give you what you need.

It is possible to run trace heating under it too, so you truly are protected.

Hi, thanks for this info. Soil pipe is actually going to be a bit big for this. Was hoping for 2 inch waste or rain water pipe.

 

[Welder]

Hi, thanks for this info. Soil pipe is actually going to be a bit big for this. Was hoping for 2 inch waste or rain water pipe.

You'll give it zero frost protection if you go to that size and it will warm very quickly - potential for legionella.

 

[Scott_D]

Can you run internally under the ceiling and box it in

 

[mutley racers]

Can you run internally under the ceiling and box it in

I offered this but as the incoming mains is in the kitchen and the cylinder cupboard is the other side of the house it will be a lot of runs through walls etc and he not keen.

I contacted groundbreaker who do insuduct and they said it is possible with 3 different ducts.

Hi Lee



Thanks for your enquiry, I hope the attached will help you get over your challenges on site.



INSUduct is designed for vertical surfaces and doesn't turn through 90 degrees easily except to turn into the wall as the details provided.



To turn at right angles to the wall, I would recommend the use of SHalloduct, which as you will see from the attached detail able to be located within either a "twin wall" pipe or extruded pipe such as a rainwater pipe (you need a minimum of 90mm clearance - if larger just use a tie to hold the two halves together).



If you need to join pipes or use a 90 degree equal elbow to go around a bend, these are often a bit "clunky" so simply ream out a little of the insulation to give space for the fitting.



Hope this helps,



Regards



Steve

 

[hammers4spanner]

Personally i would walk away sounds like it would look a bag of s***. Wouldnt want to put my name to that imho.

Another note i always laugh when expensive laminate is everywhere and you get a request to look at a job where you cant access pipes.

 

[Burger]

What size pipe does it need to be for unvented? If 15mm ok, what’s the harm using the tank loft feeds?

 

[mutley racers]

22mm is preferred due to the loss in pressure and flow of a 15mm pipe. I just used the 15mm and they are happy with it.