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Damp proofing old walls

  • 17-09-2013 10:06pm
    #1
    cosmowillie53
    Registered Users, Registered Users 2 Posts: 445 ✭✭


    I will have the walls of an old house plastered shortly (internal plastering). Would it be a good Idea to have the walls drilled(injected) now before plastering is done. I'm not sure how good the damp proof course is after all these years ...80 yrs I think. Is it expensive to have this done...cost per meter .
    Thanks.


Comments

  • #2
    whupdedo
    Banned (with Prison Access) Posts: 1,513 ✭✭✭whupdedo


    Why are you drilling the walls?


  • #3
    cosmowillie53
    Registered Users, Registered Users 2 Posts: 445 ✭✭cosmowillie53


    whupdedo wrote: »
    Why are you drilling the walls?

    I think the walls are drilled in order to insert (inject) damp proof course.


  • #4
    whupdedo
    Banned (with Prison Access) Posts: 1,513 ✭✭✭whupdedo


    cosmowillie53 wrote: »
    I think the walls are drilled in order to insert (inject) damp proof course.

    Don't know any prices but the guy doing the damp proofing should know how to go about it, no point plastering and finding out he has to drill the new work to do his job


  • #5
    red sean
    Registered Users, Registered Users 2 Posts: 2,917 ✭✭✭red sean


    I doubt very much if you'll find any dpc in 80 year old walls!
    You'll need to talk to an engineer there.


  • #6
    Maudi
    Registered Users, Registered Users 2 Posts: 1,516 ✭✭✭Maudi


    red sean wrote: »
    I doubt very much if you'll find any dpc in 80 year old walls!
    You'll need to talk to an engineer there.

    I sent you a pm. But agree with above you need to talk to someone involved with restoration before injecting walls or plastering inside walls
    .


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  • #7
    WilyCoyote
    Closed Accounts Posts: 3,059 ✭✭✭WilyCoyote


    Don't inject the walls. If injection worked you could put lightweight plaster on walls after. But these are specifically not allowed.

    Clean the walls well after removing any loose plaster. If lime-putty or hardwall, remove completely. Hose down and scud with 1:1 (clean sand:cement)
    Give a first coat of 2:1 with waterproofer
    Close in and scud with 2.5:1 with waterproofer
    Next day, float out and feather edge with 3:1 with waterproofer
    This should give a total thickness of 25mm

    Instead of skimming (you may get condensation because of the denseness of the render) blob 1/2" sheetrock and then skim.

    I did this about 15 years ago to my stone house in Kerry and it's still bone dry.

    Best of luck.


  • #8
    cosmowillie53
    Registered Users, Registered Users 2 Posts: 445 ✭✭cosmowillie53


    Thanks for all the advice folks.


  • #9
    WilyCoyote
    Closed Accounts Posts: 3,059 ✭✭✭WilyCoyote


    Doug B if you see this, resend PM. eMail not sending.


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