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DPC and........steel....

  • 06-06-2014 1:43pm
    #1
    galwaytt
    Registered Users, Registered Users 2 Posts: 12,822 ✭✭✭✭


    query for people, if you can.

    When working off ground floors, in timber construction you put DPC under the soleplates. In masonry you use DPC in the lower course of blocks. Naturally it's because of the materials involved.

    However - what about when using steel ? And I'm thinking here in terms of UC or SHS columns with base plates in individual locations within a build. Is there a requirement to use DPC under the base plate, given steel is neither absorbtive nor support of capillary action ? (that and the fact they may need to be grouted).

    I got asked this today, and I couldn't give a definitive answer: I've rang 2 S.E.'s and got opposing answers (1 Yes, 1 No), and 1 arch with a No.

    Thoughts ??

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Comments

  • #2
    sydthebeat
    Subscribers Posts: 42,171 ✭✭✭✭sydthebeat


    No, pointless.

    of course, the column and surrounds should be detailed to prevent damp ingress... but a DPC under a base plate on a foundation or rising wall would be pointless.


  • #3
    4Sticks
    Registered Users, Registered Users 2 Posts: 1,155 ✭✭✭4Sticks


    Easi-Flash%20Self%20Adhesive%20Radon%20Flashing.jpg?h=243&w=776


  • #4
    Drift
    Closed Accounts Posts: 1,395 ✭✭✭Drift


    The steel won't bring any moisture upwards but linking in with the DPC under the adjoining wall (assuming there is a blockwork wall built into the web) is a very tricky detail. I haven't used 4Sticks solution but I'll be looking into it!

    Cold bridging is a always a potential problem too.


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