Insulation of Underfloor pipes

[southernboy]

Does anyone know the insulation thickness for pipes laid under a suspended floor, ie below any insulation? This is for a new extension.

Many Thanks

 

[meldrew's_mate]

Water regs.
Wall thickness minimum the same as the pipe diameter, so for 22mm pipe you should use minimum 19mm wall thickness as 22mm outside diameter is 19mm inside (or bore)

 

[southernboy]

Dear Meldrews Mate, I think the regs have changed. For under a suspended floor, the insulation has to be increased as from April 2006.
15mm has to be 35mm thick , 22mm has to be 25mm thick. In the insulated part of the house the requirements are less 25mm thick for 15mm, and 19mm thick for 22mm. Just seen this on the climaflex website.

Cheers.

 

[Nige F]

Not one of those Banjo playin` Southern boys

 

[Agile]

I think the Mate was confusing the insulation required on heating pipes and water supply pipes.

For ages the insulation on water supply pipes has needed to be thick so the outside diameter just for a 15 mm copper pipes was about 3" or 75 mm.

Only a very few installers ever insulated heating pipes under a suspended floor in spite of the vast loss of heat. Most were insulated during the 70s with wrapped felt and a very few later with the economy foam.

Tony

 

[Nige F]

Proud to be one of "the few"....and did outside draincocks too decent foam too...............never made a fortune ,and then came the gas regs Pass the Luger