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Green Building Bible, Fourth Edition
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General: FlashBand application

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  1.  
    • CommentAuthorRex
    • CommentTimeJun 18th 2022
     
    What ho one and all,

    Following a previous thread (http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17452) I have now decided on the way forward. Probably a bit of a bodge, but will most likely see out my lifetime.

    Plan to fit a timber drip edge just below the top of the wall on both sides, then cover the top and drip edge with FlashBand. Fortunately, it will work with 600mm FlashBand. At least this will prevent sitting water on the top being absorbed into the brick and mortar.

    I will be applying FB primer first, but this raises some questions as I have never used it before.

    The wall is 9m long which may make installing the FB tricky. Does the primer dry to be non-tacky or is it like contact adhesive where the first contact between the FB and primer is kinda final?

    I am considering applying the primer and then the FB in 1m sections as working with a 9m length of sticky stuff will not be easy. How long does the primer need before the FB can be applied?

    Any advice will be appreciated.

    Thanks and toodle pip
    • CommentAuthorcjard
    • CommentTimeJun 18th 2022
     
    The can says:

    Suitable for priming brickwork, cement renderings, roof tiles, concrete,
    mineralised felt, timber, etc.

    Directions For Use

    •Surfaces should be sound, clean and free from dust
    , and loose materials. Non-porous surfaces should be
    dry or very slightly damp. Porous surfaces should be
    dampened with water immediately before application.
    • Apply primer with a water dampened brush to
    a line slightly in advance of where Flashing tape
    is to be applied.
    • Allow to dry. Protect from rain and frost.
    • Clean brushes after use with water and a little detergent.
    • CommentAuthorcjard
    • CommentTimeJun 18th 2022 edited
     
    Flashband is an aluminium weather layer, a bitumen layer and a peel off backing tape that is some sort of plastic. It's not that sticky even when the peel off tape is removed, but it's tackiness increases if it's warm. Apply in cool temperatures (and also start with it being in the fridge?) if you want slightly easier working with, but it's very forgiving in any case; it's not like fighting with a long length of parcel tape..

    Personally I'd unroll it in a one'er, weight the far end in approximate position and then work toward the far end, peeling the backing off and sticking it down as I went. You'll see what I mean when you have a play with it

    On the temperature note, warming it with a heat gun after you've got it positioned if you manage to find a cool day) and working along will help it adhere. You can also wait for a sunny day to bake it up and then get a hard roller out.
    • CommentAuthorowlman
    • CommentTimeJun 18th 2022
     
    Don't worry about the longevity of the stuff Rex. I've had some on the gable end of my outbuildings that's been there 34 years and still OK. Choose one if possible with a good thick aluminium layer.
  5.  
    I used some of the b&q version and agree with the comments about it sticking best when warmed, and firm it with a hard wallpaper-edge roller
    • CommentAuthorRex
    • CommentTimeJun 19th 2022
     
    Thanks for the comments. I have bought the Bostick version; don't know if that is the thickest but figure a known brand will be OK.

    Part of the reason for my question is that I have a neighbour, ex-architect and he gets into the deep details of everything. His suggestion for ease of application, is to cut it into 1.5m lengths and have a 20mm overlap. I can see the point, but I see no reason to create unnecessary joints. So that is not likely to happen.

    I'm sure it will all be OK, I'm probably over-thinking the potential problems.
    • CommentAuthortony
    • CommentTimeJun 19th 2022
     
    It is a bodge! He is thinking that it will buckle and crack due to thermal movement. Suggested overlap seems small, lead would be welted joins but yours would be subject to thermal movement and cracking but not really a problem if it does.
    • CommentAuthorCliff Pope
    • CommentTimeJun 20th 2022
     
    I find it sticks best if there is an instant tackiness between the band and the thing it's sticking to. I've used the kind of primer that seems to be bitumin-based, let it partly dry, then work along pressing the band on firmly. Pull the backing tape off as you go to stop the unused band sticking to things and picking up dirt until you get to the point you intend sticking. (the Sticking Point - Macbeth :) )

    I did once find the primer had dried a bit too much and the band was reluctant to stick well. I put on another thin coat and pressed the band on straight away.

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