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  1. #1
    Join Date
    Feb 2012
    Posts
    2

    Default Scratch Coat for Stone Veneer

    I installed lath and a scratch coat for a stone veneer; however, I believe I mixed the mortar too stiff and it turned out brittle and chalky (plus I didn't let it set before hitting it with the notched trowel). I knocked down the tops to make it a little more solid, but I'd like to know if there is a repair I can do to harden the surface, or should I do the scratch coat again?

  2. #2
    Join Date
    Jul 2010
    Location
    SoCal
    Posts
    6,318

    Default Re: Scratch Coat for Stone Veneer

    Start from the beginning.

  3. #3
    Join Date
    Jun 2009
    Posts
    303

    Default Re: Scratch Coat for Stone Veneer

    I don't think you mixed it to stiff.
    It most likely dried reather than hydrated.
    If it has a bond to the lath and you can't remove it by pressing on the lath you should be able to apply a second coat of the following.
    1 Part Portland Cement
    1/2 to 3/4 parts Masons Lime
    4.5 Parts sand
    After you have applied this coat make sure you mist the surface with water to keep it from drying out Mist about four hours after it was applied than as required to just keep moisture available on the surface.

  4. #4
    Join Date
    Feb 2012
    Posts
    2

    Default Re: Scratch Coat for Stone Veneer

    Clarence:

    Thanks for your help. How much water would you add to your mix? Or what consistency should I try to achieve?

  5. #5
    Join Date
    Jun 2009
    Posts
    303

    Default Re: Scratch Coat for Stone Veneer

    If the mortar will stay on trowel when you turn it so the mud is on the bottom you should be go to go.
    I use a margin trowel dip it in the mortar get about 1 inch of mortar as wide as the trowel and invert it.

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