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Question about fitting a new cold water tank in attic

  • 14-02-2018 08:34PM
    #1
    cojomo2
    Registered Users, Registered Users 2 Posts: 3,219 ✭✭✭


    Hi,

    Fitting a new headder tank in the attic. Is it safe to assume the existing copper pipes are imperial size (fitted about 30 years ago)?

    If so I need to drill holes in the tank for 1/2" and 3/4" compression tank fittings. Question is, what size holes should I be drilling for each?

    Cheers!


Comments

  • #2
    Tom44
    Registered Users, Registered Users 2 Posts: 951 ✭✭✭Tom44


    3/4" hole for 1/2" tank connection
    1" for 3/4" tank connection

    Use washers

    Perfebaly call plumber, to guarantee sealant.


  • #3
    cojomo2
    Registered Users, Registered Users 2 Posts: 3,219 ✭✭✭cojomo2


    Tom44 wrote: »
    3/4" hole for 1/2" tank connection
    1" for 3/4" tank connection

    Use washers

    Perfebaly call plumber, to guarantee sealant.

    Thanks, rubber washer on the inside of the tank I assume? Or one each side? I have 16mm and 25mm holesaw bits, that sound ok? Cheers


  • #4
    Sleeper12
    Registered Users, Registered Users 2 Posts: 17,286 ✭✭✭✭Sleeper12


    Make sure that it's sitting on plywood or similar. Old galvanised tank can sit on joists but plastic tank needs to be fully supported. They will bend out of shape if not supported correctly


  • #5
    cojomo2
    Registered Users, Registered Users 2 Posts: 3,219 ✭✭✭cojomo2


    Sleeper12 wrote: »
    Make sure that it's sitting on plywood or similar. Old galvanised tank can sit on joists but plastic tank needs to be fully supported. They will bend out of shape if not supported correctly

    Yeah thanks, I have a load of spare laminated chipboard, was planning on using that.


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