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replacement sash window sill / Membrane between sill and brick?

Discussion in 'General DIY' started by james19000, 9 Aug 2020.

  1. james19000

    james19000

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    Hi good folks of the DIYnot community.

    I'm replacing the rotten sill of a sash window.

    Having removed the rotten sill, i'm presented with row of bricks.

    I'm going to lay a new bed of mortar for the new replacement sill to sit on.

    Do I need to put some kind of semi permeable membrane in?

    and if so, between which materials do I place it.

    If I do have to place a membrane or some sort, any recommendations.

    I hope i've explained myself clearly,

    Pls have a look at the attached photo, I think it will be self explanatory what I'm attempting to do.

    Any tips or advise will be most welcome.

    Thank you for reading and thank you for any comments.
     

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  3. mrrusty

    mrrusty

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    No, you don't need to put a membrane under the cill, but do make sure the new cill has a good drip bead under the outer edge. If you put a waterproof layer under the cill you actually risk creating a water trap should any drips get under the cill

    As a matter of interest, are you taking the opportunity to install draught strips? you can get parting & staff bead with seals. e.g. https://www.reddiseals.com/product-category/sash-window/beading/
     
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