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Lean to Roof Flashing

Discussion in 'Roofing and Guttering' started by phillskie, 9 Jul 2019.

  1. phillskie

    phillskie

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    Hi All
    I am building a 9 meter long lean to with 10mm twin wall polycarbonate roofing onto side of my house with a pebbledashed wall. I know lead is best for flashing this but I am looking for a cheaper but effective alternative product to traditional lead flashing as this would cost quite a bit to an already costly project.
    Any advice would be appreciated.

    Thank you
     
  2. Notch7

    Notch7

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    Lead alternative like ubiflex, cromar lead free etc.

    If want a real cheap job you could grind a slot in the wall and put in some flashband. To sort out the bumpy pebbledash, screw on a batten or plywood with a chamfer to top edge all the way across, just below the slot youve groung out. Run a 300mm flashband across the polycarbonate so it comes up the timber strip, stopping just below the chamfer. Push 100mm or 150mm flashband in the wall and stick down. Use leadmate to fill slot in wall.

    This 2 section flashing means its possible to do the job neatly, its hard to do in 1 piece -true for lead too.

    It goes without saying, Im not recommending this -code 4 lead is what you really need.
     
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  3. bobasd

    bobasd

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    to cut your slot, locate the most convenient mortar bed for your cover flashing, and mark it A & B at either end of your 9m.
    then flick a chalk line from A to B, and thats the line you will grind out.
    this way your not disfiguring brickwork.

    do the above, and fix the cover flashing, before you fix any sheeting to the rafters.
     
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  4. phillskie

    phillskie

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    Thank so much for that
     
  5. ^woody^

    ^woody^

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    They cost the same or even more than lead! And performance is unproven. Like posh flashband.
     
  6. Nige F

    Nige F

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    Length of lead max 1.5 metres. then 150mm overlap ....and so on to your 9 metres
     
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