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Plaster Touching Plywood - Bad?

Discussion in 'Plastering and Rendering' started by ILikeDIYS, 14 Dec 2018.

  1. ILikeDIYS

    ILikeDIYS

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    Just boxed up and plyed the bottom inside of an ex-airing-cupboard for a friend.

    She insisted doing the ply before plastering the back wall (half exposed bricks + half old plaster).

    Now she is saying she doesn't want the plywood under the plaster (plywood is up to the wall which is to be plastered).

    She is saying to plaster the wall... then use a multi-tool to cut the plywood down so it is not under the plaster :confused:

    She says the plaster will affect the plywood and may cause the plywood to need replacing in the future - the plywood has had 2 coats of Danish oil.

    I am thinking just duck tape the plywood around the edge where it meets the wall... then cut the excess duck tape off up to the newly laid plaster after it has set so the duck tape is in between the plywood and new plaster so there is no contact between plywood and plaster.

    But a part of me thinks this is all unnecessary and I should just plaster from the plywood.

    What do you guys think?

    Thanks.
     
  2. Yeahaa

    Yeahaa

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    Remove the ply , plaster the wall , scribe the ply back to the wall ? .
     
  3. opps

    opps

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    Erm, that plaster won't touch the ply. It will touch the danish oil on the ply.

    In time, a hairline crack may appear where the plaster butts up to the plywood but a thin bead of caulk will suffice.

    Not wanting to malign your friend, but, how will the plaster affect the ply X years down the line?
     
  4. ILikeDIYS

    ILikeDIYS

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    I don't know! I guess it's her over-analysis of the situation.

    She also wants the ply to be removable just in case it gets damaged and needs to be replaced... but I'm sure it can easily slot out from under the plaster anyway... especially when there is masking/duck tape between them.
     
  5. opps

    opps

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    Fair enough, at that point you then use a multi-tool or knife to break the seal with the plaster. Provided that there are no screw heads buried below the plaster I still don't see what the problem is. Perhaps a photo when you have the time will help.

    I honestly don't see the point in using gaffer tape/etc. The ply already has Danish oil on it. Gaffer tape is a pain to cut flush because of the strings in it. The plaster is more likely to stick firmly to masking tape than the Danish oil.

    Sorry, I can't see any logical reason for removing the ply and then re-scribing it. Just strikes me as being a (long) waste of time. If your friend is insistent then I hope you charge her accordingly...
     
  6. DIYnot Local

    DIYnot Local

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