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Wet Window Sill

  • 06-04-2008 4:25pm
    #1
    bobdebuilder
    Closed Accounts Posts: 5 ✭


    Hi
    I have a problem with two window sills, The inside of the sill is Wet & damp. This is very bad when we have heavy rain & wind. Recently I knocked off the hardwall & mortar under the window as it was falling off. Then I could see the DPC coming straight in under the sill to just meet the hardwall. These sills were cast inplace when the house was built around 1970. I then drylined the wall but i now have a lot of dampness in the room ceiling & the Sill is wet. I have fitted new pvc dbl/g windows & the window man says that the wet is coming in through the sill along the DPC & rising up to the heat.
    Has anyone got any idea how i can stop this,
    How can I seal the sill outside to stop the water lodging inside on sill
    Regards
    Bobdebuilder


Comments

  • #2
    muffler
    Registered Users, Registered Users 2 Posts: 46,550 ✭✭✭✭muffler


    Sounds as if the dpc is wrong and not turned up at the back.

    Can you post a couple of pics?

    Should have been sorted before you fitted the new windows.


  • #3
    kadman
    Moderators, Home & Garden Moderators Posts: 5,126 Mod ✭✭✭✭kadman


    With new windows fitted, chances are that the old windows had a front drip, and even though the cills were cast in to the window, there should be enough room to snap in a pvc drip to the bottom of the new windows, if the new windows are positioned at least 12 mm foreward from the concrete up stand. This provides a better weathered solution than tons of silicon.

    I think you have identified your own problem regarding the dpc running from the external face to the internal face. only solution here is to break out the backfill of the window cill, or if it has been cast full depth, cut it behind the window frame down to the dpc and break it out. Turn up dpc , add a strip of eps insulation and back fill. Drastic allright,but easily done by a pro. Only solution to guarantee a decent result.

    kadman


  • #4
    bobdebuilder
    Closed Accounts Posts: 5 ✭bobdebuilder


    Thanks Kadman.
    The old windows had No front drip fitted. They just sat on the upfill of the sill then the they windowman filled the gat with cement only. The New windows have a Front drip of 32mm in height fitted to the window & sits on the sill. The new windowman took away the cement that had been against the up fill.
    I have heard of what you suggest with cutting the sill inside but as you say Drastic action. I have a question for you, Have you heard about putting on Fiberglass on the outside of the Sill depth of say 6mm????
    Would this be a good solution to my problem.?
    Note this has been like this for years
    Regards


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