pipe lagging

[mom01]

Hi. We're building a new chalet bungalow with joists not bison slabs. 1st fix going on at minute and pipes laid upstairs. we've noticed that the pipes have only been lagged in the eaves and no where else. We've been told that this is standard but we're not convinced. Would it not be better for both heat loss reduction and to reduce noise from pipes to lag them all?
Also, what is the best stuff to use?

thanks

 

[namsag]

Eaves only. if cylinder fitted, pipes around it need doing

 

[gas4you]

Heat from pipes in floors adds to warming the floor above it.

Pipes off HW cylinder should be lagged for a minimum of 1M or up to where they enter the wall.

 

[bengasman]

Under the ground floor would be a good place for lagging as well

 

[JohnD]

builders will tell you that unlagged heating pipes contribute to the general heating of the house. however it is uncontrolled and may be unnecessary and wasteful

however there is no benefit from leaving hot water pipes (for taps) uninsulated. It is harmful to electric cables to get them very hot as they may do if in the same void as the heating pipes.

as a householder I prefer to insulate all pipes, especially around boiler and cylinder where that lose a lot of heat. It would cost builders extra labour and materials so they don't*. Do it yourself. Climaflex or similar polythene foam (quite stiff) is very good. The BS grade for external use or unheated spaces like lofts, garages, under ground floor, is as thick as your arm, there is also an economy grade which is OK under the first floor and round the cylinder. Get the matching tape to hold it on at joints and bends.

edited
* and they will not have included this in the price they quoted, so if you ask for it to be added on, it will cost you. That's how they make their money, by charging for all the extras.

 

[someonelse]

Heat from pipes in floors adds to warming the floor above it.

If you have fitted carpets, pipes below the floor will add very little heat to the floor above - unless you drill little holes in the carpet to let the heat rise