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What is the best way to get watertight seal between flat roof and house wall

Discussion in 'Roofing and Guttering' started by Mojo12345, 24 Sep 2019.

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  1. Mojo12345

    Mojo12345

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    0C497AD4-6FEE-4178-A988-1F1F576C898F.jpeg F431B307-9D47-43BC-B2D2-4A7D3AEDC395.jpeg E288F3EB-9C57-4689-9E84-D2C1676EC070.jpeg 6FEB0DA4-FE48-4873-9ACE-BFFB5C25AC8B.png Hi everyone I am getting a new flat roof done because my old one was leaking I am getting the falls changed and they were wrong and had the window change what is the best most water tight seal I can get between the flat roof and house wall is it led flashing or beading? I’m confused any help or advice would be great thank you, the window has been changed to a smaller one to allow for a better seal
     
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  3. Notch7

    Notch7

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    Its simple really and the same for any roof covering.

    The flat roof material is turned up vertically at wall abutments (a special trim maybe requied depending on material used).
    Then a chase is cut in the wall and lead flashing is then dressed down over the flat roof upstand.
    There is need fot any seal as such behind the lead.
    Lead seal mastic can be used to seal the chase instead of mortar - there are special lead flashing clips to grip the lead in the chase, might be good -its important the lead gets in the chase deep enough

    Pipe penetrations are tricky if close to the wall - mske it difficult to seal behind.

    You may take advise on whether cavity trays are needed -not necessarily on rendered walls, but NHBC recommend it.
     
  4. Mojo12345

    Mojo12345

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    Ok thanks for the advice
     
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