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Green Building Bible, Fourth Edition
Green Building Bible, fourth edition (both books)
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Products: "Z flashing" - Available in UK?

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      CommentAuthorJustin
    • CommentTimeJun 22nd 2014 edited
     
    Has anyone in UK come across anyone supplying "Z flashing" strips? Commonly found (after a dig about the web) I notice, in US or NZ where horizontal timber cladding is more common. Used to flash between square cut horizontal cladding timbers.

    I can't find any UK suppliers who even use the terminology, unless it's different here and I'm missing something.

    My application is in this case only a shed which I plan to clad in square sawn timber. Z-flashing strips (if I could find them supplied anywhere, without getting them specially folded) may work out more economical than doing my own with lead, or with a roll-type lead alternative - which isn't much cheaper.

    Rgds
    • CommentAuthorowlman
    • CommentTimeJun 23rd 2014
     
    I'm curious Justin. Horizontal cladding in UK more usually takes the form of shiplap, half-lap, T&G, splayed, Waney, or something with an overlap etc etc. Horizontal butt jointed boarding is occasionally used but I haven't seen it flashed between each board. What configuration are you using that requires flashing between the cladding timbers, (each?).
    The only "ZED" section metal I've come across is in the aluminium supply field where it's a fairly common extrusion in various sizes. For galvanised sheet I think you'll have to get it folded, not too difficult a job as you might think.

    Mike
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      CommentAuthorJustin
    • CommentTimeJun 23rd 2014 edited
     
    Hi Owlman.
    The planks I have my eye on are very good value, green oak from a local mill. Square cut, so no overlap and even though it's cheap, (without overlap works out about £18 per M^2), I was trying to limit the amount of wood involved. I could use if vertically and rip up some cover pieces, maybe that would work out cheaper than getting in maybe expensive material to fabricate individual flashings.

    Regarding "Zed". See here, [url]http://bit.ly/1l4icQ8 [/url] or here [url]http://bit.ly/T3DMNV [/url] But not, it seems, in the UK..
    Rgs
    Justin
    • CommentAuthorowlman
    • CommentTimeJun 23rd 2014 edited
     
    If the sawmill are amenable you could ask them to tilt the saw and instead of a 90 degree cut, have say a 30 degree cut on both edges to create a parallelogram. Then use the boards horizontally as planned with the 30 degree slope backwards and upwards to the wall. Some call it splayed boarding. If you then "knock" off the bottom sharp edge you will create a horizontal vee feature groove, and no need for flashings, it could look quite good.
    •  
      CommentAuthorfostertom
    • CommentTimeJun 24th 2014
     
    Or lap the boards clinker-boat style. Works fine with thick boards in oak, larch etc - no need for taper-cut boards as typical with cedar.
    • CommentAuthorgooday
    • CommentTimeJun 24th 2014 edited
     
    We used oak cladding on a outbuilding, just square boards(approx 20mm thick) no tapering. Works and looks good. Has now weathered a bit and is a lovely grey!
      IMG00032-20110325-0645.jpg
    •  
      CommentAuthorJustin
    • CommentTimeJun 28th 2014
     
    Yes, probably better just to lap them a little as suggested, the small loss in width for a minimal lap will be more than compensated by not needing to mess about with flashings. Sawmill I am sure would cut the angle, but the extra charge probably not worth it. They cut these as standard and sell them at good price because no fuss.

    Rgds
    •  
      CommentAuthorJustin
    • CommentTimeJun 28th 2014
     
    Yes, probably better just to lap them a little as suggested, the small loss in width for a minimal lap will be more than compensated by not needing to mess about with flashings. Sawmill I am sure would cut the angle, but the extra charge probably not worth it. They cut these as standard and sell them at good price because no fuss.

    Rgds
    •  
      CommentAuthorfostertom
    • CommentTimeJun 30th 2014
     
    You can lap square cut just fine- no need for funny angles.

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