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fitting flashing over concrete lintel

Discussion in 'Building' started by Tom__40, 20 May 2021.

  1. Tom__40

    Tom__40

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    Hi. I have an old 50s house and need to install concrete lintels on the outer leaf for the downstairs window openings, prior to replacing the windows. Am I right in thinking the correct way to install flashing would be on top of the new lintel, and up/sitting back against the inner leaf spanning the cavity? Is the idea is any moisture dripping/moving down inside the cavity is directed by the flashing outside?

    Also, any recommendations on type of flashing to use/brand names worth looking for?

    Thanks
     
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  3. ^woody^

    ^woody^

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    Do you mean cavity tray?

    Polythene DPC of suitable width chased in to the inner leaf.
     
  4. stuart45

    stuart45

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  5. wessex101

    wessex101

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    Concrete lintels in the outer leaf! Are you sure? It will look really naff.

    A steel single leaf lintel built in with matching brickwork would look a lot better.
     
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  6. Tom__40

    Tom__40

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    Hi. I'm just aware how much everything costs these days. I'm fairly confident I could hire some props, prop the wall, remove bricks, fit a concrete lintel and then to improve the look you can get for example acrylic brick slips in a contrasting colour to give the appearance of a new soldier course. If I hire a builder to do it (especially round here in the South East) it'll likely cost a fortune. One snag I seem to have hit is that despite the BC surveyor saying a concrete lintel would be acceptable he says that my application is for replacement windows and does "NOT include structural changes". I'd have thought it was obvious if replacing windows and a new lintel is required then you be allowed to fit it! He did ask why I wanted to remove the soldiers, maybe he's thinking I'm trying to make the opening bigger or something? I'm not...but it really would look weird to fit a concrete lintel underneath (if that what he was thinking) and make the opening for the window smaller.
     
  7. ^woody^

    ^woody^

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    You can replace widows without replacing the lintels. You can replace a lintel without replacing the window.

    The former is an application under Part L1b, the latter under Part A, and the two are different, require different checks and different fees, and it's not up to the Council to guess what work you are actually doing.
     
  8. cdbe

    cdbe

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    A 1.8m single leaf steel lintel is about £50, and will also serve as a cavity tray. You'd be mad to mess about with a concrete and bits of dpc and brick slips to save £20-30.
     
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