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insulating heating pipes from shed to house

  • 06-08-2007 8:40pm
    #1
    fatchance
    Closed Accounts Posts: 98 ✭✭


    Hi all,


    The new boiler in shed and plumber ran two 3/4" pipes(return and feed) to the house through a 6" wavin pipe as a ducting. These two pipes are covered with lagging about 20mm thick. Distance from shed to house is approx. 30ft.

    Sooo the question is.....

    Whats the best way to stop heat loss from the pipes leading from boiler in the shed to the house? The pipes are already laid and through ducting. How did ye do it or seen it done. Just want to minimise heating the ground!

    thanks for the help, want to get this sorted before the trench is back filled!

    Vinnie


Comments

  • #2
    muffler
    Registered Users, Registered Users 2 Posts: 46,542 ✭✭✭✭muffler


    Better off in DIY.

    Moved


  • #3
    [Deleted User]
    Posts: 31,118 ✭✭✭✭ [Deleted User]


    Not sure of the best way to insulate (new) existing pipes, but what I did was to use "district heating" pipe, this is insulated pipe that is designed for the job.

    Here is an example.

    I can only suggest a layer of EPS (expanded polystyrene) around the duct, most aother materials will get waterlogged and lose their effectiveness.


  • #4
    ircoha
    Closed Accounts Posts: 2,290 ✭✭✭ircoha


    there will be a problem if water gets into the 6" wavin.

    Can u be sure 100% that the wavin connections are all properly made and both ends are well clear of the ground so that there is no way water can get in.

    U might consider a can of expanded foam at each end to seal the pipe and keep vermin out
    When back filling the trench be sure the wavin pipe is not damaged with rocks etc and that all joints are fully supported so as they dont pull out when the back fill is going in.

    You will have a fair bit of heat lost as a result of the 2.5 gallons of 'dead water in the pipes


  • #5
    Evergreen
    Registered Users, Registered Users 2 Posts: 254 ✭✭Evergreen


    The best way to prevent heat loss is to dig up what the plumber has put down and install the correct pre-insulaed piping. In my opinion, plumbers who do such athing without consulting the owner should be penalised in some way, in this day and age of energy conservation it is a joke.

    No matter how much insulation you put on those pipes there will still be a lot heat loss, best seen on frosty morning when you will see a nice dry frost free patch on the ground over the pipework.

    There are many different types of pre-insulated pipe on the market with Pulsar being the worst performing and Calpex/Rauhthermex being the best performers with approx 1°C being lost every 100m. This pipe is expensive though, b e prepared to pay €37 + VAT per meter - it's worth it.


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