Should mains in blue plastic pipe be insulated?

[Deansplit]

Should mains in blue plastic pipe be insulated if being buried in concrete floor?
What depth should the pipe be laid at outside the house from the water services' toby?
What depth should the pipe be laid at inside the house?

 

[rojaca]

750-1350mm deep. should be insulated where it enters the property if the distance from the outside ground level to the pipe is less than this at any point.

Would love to do drawing to illustrate this but this is ChrisR's forte and he may think i'm upstaging him

 

[Deansplit]

So excuse my misunderstanding - not insulated outside if below 750 but insulated inside if less than this?

 

[ChrisR]

Would love to do drawing to illustrate this but this is ChrisR's forte and he may think i'm upstaging him

COme come, you could have knocked something up:

 

[Deansplit]

Many thx, so from what i can see, insulation only on joist area (although mine's a concrete floor) - or is that insulation inside the duct?

 

[Perfectionist]

That drawing has a suspended floor. Assume it is concrete,then insulation is not needed. The pipe is below the frost line and enters the heat envelope of the house.

 

[rojaca]

thats not my interpretation. if it is within 750mm of the surface or outside whether or not it is inconcrete etc it should be lagged until it enters the thermal envelope of the property. certainly if you look at the diagrams in the wras guide to the water regs I think this supports this.

 

[kevplumb]

if it's lagged and don't need to be it's hardly gonna hurt

for the sake of a couple of feet of lagging

 

[htgeng]

A two metre length of 28mm x 25mm wall thickness lagging down the duct would be what I'd aim for. Last time I did that and inspection guy came he said he had refused to connect a supply where some gypos had dug a foot deep trench while laying a load of block paving for the owner. Of course they had scarpered with the money and was too late to dig a new trench.

 

[Deansplit]

Oh, just back - bought 19mm - I'll lag from my boundary connection to the inside of the house. How deep once in does it have to be (minimum)? The joists are being removed and a concrete floor installed - presume it goes at the bed of this?

 

[muggles]

It should enter the property at a minimum of 750mm below ground, it can rise once inside as per ChrisR's drawing

 

[Deansplit]

unlagged? But there must be a min depth it's allowed to be at?

 

[kevplumb]

lag it anyway
won't do any harm

 

[Deansplit]

But it's a bit pointless if I 'don't' need to - it's 9m so best part of a tenner - not got money to burn, that's 4 pints!!

 

[kevplumb]

not got money to burn, that's 4 pints!!

your in the wrong country

$14 gets you about 9 in t states