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Lagging hot water pipes in linen press

  • 20-03-2013 2:36pm
    #1
    heavydawson
    Registered Users, Registered Users 2 Posts: 1,210 ✭✭✭


    Hey all,
    Had the plumber on site over the weekend, and was going through some bits and pieces. We have a linen press upstairs, and when I brought up the topic of lagging the pipes, he said he'd usually leave them exposed in the linen press.
    I was a little concerned about leaving ANY hot piping (or cold piping in areas with potential for freezing) exposed.

    To be fair, he said he'd have no problem lagging them, just that that was how'd they'd normally do the lagging in the linen press. Hot water tank is in the press.
    Tagged:


Comments

  • #2
    tusmaith
    Registered Users, Registered Users 2 Posts: 42 ✭tusmaith


    The building Reguations TGD L 2011, conservation of fuel and energy state that: "Hot water pipes and ducts within the normally heated area of the dwelling that contribute to the heat requirement of the dwelling do not require insulation. The hot pipes connected to hot water storage vessels, including the vent pipe and the primary flow and return to the heat exchanger, where fitted, should be insulated for at least one metre from their point of connection."
    Hope this helps.
    Tusmaith


  • #3
    heavydawson
    Registered Users, Registered Users 2 Posts: 1,210 ✭✭✭heavydawson


    tusmaith wrote: »
    The building Reguations TGD L 2011, conservation of fuel and energy state that: "Hot water pipes and ducts within the normally heated area of the dwelling that contribute to the heat requirement of the dwelling do not require insulation. The hot pipes connected to hot water storage vessels, including the vent pipe and the primary flow and return to the heat exchanger, where fitted, should be insulated for at least one metre from their point of connection."
    Hope this helps.
    Tusmaith
    So the inverse of what I said. Lag in the linen press (the 1 meter) and leave exposed elsewhere? There's something very strange about that to me. I'd want a controlled point for heat radiation (the radiator), and minimal heat lost during circulation.
    Sure the heat loss should be retained by the house insulation, but surely this means the circuit losses are exacerbated to a far greater extent, so that the last rad on the circuit gives off far less heat when lagging is not applied?
    Also what happens when there's cold water in the pipe and the room is very warm? Is condensation forming on the pipe not an issue?

    I appreciate the link Tusmaith, and I should have checked there first, but still curious to know if my concerns above are valid.


  • #4
    tusmaith
    Registered Users, Registered Users 2 Posts: 42 ✭tusmaith


    i wouldn't say there is a whole lot wrong with your logic, it is not however a requirement in the building regulations.
    i would agree that all water pipework, subject to practical constraints, should be insulated unless it contributes to the useful heat
    requirements of the dwelling.
    this will ensure that there is no loss of heat.
    i wouldn't say that condensation when there's cold water in the pipe and the room is very warm is a common issue, the water in these pipes is taken from the storage tank in the attic so the temperature difference shouldn't be so great as to cause condensation, but i am open to correction.
    if it is a concern, you could lag all the pipework in the hot press, this will be relatively inexpensive to do and should be a DIY job. ensure that the joints are done correctly, use cable ties to secure the lagging and ensure that the joints are mitered (not butted) where necessary. also ensure that you get the correct internal diameter lagging for the pipes in the hot press.


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