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  1. #1
    Join Date
    Nov 2007
    Location
    melbourne
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    2

    Default Is aluminum flashing under bottome plate a good idea?

    I'm building an extension on a concrete slab...i forgot to put down a water proof membrane...its too late now (as the slab is done)...but i haven't put the wooden frame up (its a brickveneer extension)...I was just wondering..if it would be a good idea to
    put the bottom plate on a strip of aluminum flashing, rather than directly on the concrete...
    just as a bit of insurance.... is this sensible?

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  3. #2
    Join Date
    Feb 2003
    Location
    Garvoc VIC AUSTRALIA
    Posts
    11,464

    Default

    plastic flashing is good enough and easier to work with
    Regards, Bob Thomas

    www.wombatsawmill.com

  4. #3
    Join Date
    Feb 2006
    Location
    vic
    Posts
    175

    Default

    I am assuming you forgot to put down your poly under the slab ? is this right ? How did your steel inspection get passed for your slab ? You will probably get rising damp problems ?

  5. #4
    Join Date
    Nov 2007
    Location
    melbourne
    Posts
    2

    Default

    Well the extension started off as a vehrander (so no poly under slab)...and now i put a new building permit in to add walls to it...to make it part of the house.. anyway, its on a little slop...with nice drainage away from the slab, and the slab is reasonably high...about 30-50 cm, so i'm hoping that i don't get too much rising damp... anyway, i'll put some flashing under the bottom plate..just as a bit of extra insurance....if anyone has any better ideas...let me know...thx for all responses...

  6. #5
    Join Date
    Oct 2003
    Location
    Kentucky NSW near Tamworth, Australia
    Age
    85
    Posts
    3,737

    Default

    Maybe a good coating of epoxy paint over the slab would help.

  7. #6
    Join Date
    Feb 2003
    Location
    Garvoc VIC AUSTRALIA
    Posts
    11,464

    Default

    If the slab is lower than the house floor you could batten it over a membrane and fit a sheet/timber floor at the same level as the house floor

    Stay with the flashing under the walls.
    Regards, Bob Thomas

    www.wombatsawmill.com

  8. #7
    Join Date
    Mar 2007
    Location
    Adelaide South Australia
    Posts
    544

    Default

    Don't use alu as it will corrode out in less than a year. Use a plastic viscourse under the timber plates to stop any rising damp

    There are a number of surface paints that can be used to seal the concrete which would be advisable to use especially if you are going to lay carpet or vinyl.
    Don't force it, use a bigger hammer.

    Timber is what you use. Wood is what you burn.

  9. #8
    Join Date
    Oct 2007
    Location
    geelong
    Age
    52
    Posts
    120

    Default

    Quote Originally Posted by Barry_White View Post
    Maybe a good coating of epoxy paint over the slab would help.
    This is what I was thinking .
    Seal the slab with 2 part epoxy and any holes with sikaflex or simular.

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