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Green Building Bible, Fourth Edition
Green Building Bible, fourth edition (both books)
These two books are the perfect starting place to help you get to grips with one of the most vitally important aspects of our society - our homes and living environment.

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    Caught sight of this in a Northern town. It spans the ridge, with frames fixed to 2 dormers.
    • CommentAuthortony
    • CommentTimeNov 22nd 2013
    Yes in high winds -- it also looks like it needs planning to me and a structural engineer and building regs...
    Yep! Agree with you, Tony!
    • CommentTimeNov 22nd 2013
    I was asked to calculate the windloading on a ground mount system. It was up near Tintagel, so pretty windy. But when I looked into it was not that high a load because the system was South facing and the week winds were from the North.
    There is a system on one of the council buildings down here that just sits on the roof. It relies on the wind to pin it down. And we have 100 MPH winds every year. 60 to 80 MPH ones are pretty common.

    Though that system does look a bit dicey.
    • CommentAuthortony
    • CommentTimeNov 22nd 2013 edited
    What is the wind blows the wrong way?
    • CommentTimeNov 23rd 2013
    The only high risk direction was from the North and North East in that installation.
    The very strong winds here are the Westerlies.
    • CommentAuthortony
    • CommentTimeNov 23rd 2013
    usually :wink:
    • CommentAuthorwindy lamb
    • CommentTimeNov 23rd 2013
    Yes! cos you can always get a gust from any direction. Surprising how the wind can lift stuff. Neighbour's wooden stable block blew across the road - the whole thing, another neighbour's stable went upside down and is now tethered to a tractor and another mobile field shelter is on it's roof 100 yards from it's original position. All these where considered in sheltered positions!
    • CommentTimeNov 23rd 2013
    Looks gr8, if strongly enough mounted. I love it when something clearly modern has been carefully done to an otherwise traditional building, announcing that 'this one is ready for 21C'. Most solar panel installations say that, but so timidly done, as if hoping to be un-noticed, that they just look crass. This one is real architectural invention - tho I suspect accidentally!
    • CommentAuthorchuckey
    • CommentTimeNov 24th 2013
    I think the irony is that the panels are at risk due to the shape of the adjacent roofs. Most "wind" damage is actually caused by the low pressure when the wind blows over a ridge. Most structures are self supporting and rely on gravity to hold them down (at least partially), once there is a suction force from the top, the weight is removed so the thing rattles about until the wind gets under the front edge and away it goes. The original Emley Moor tubular TV mast fell down due to the low pressure behind it swinging from side to side and exciting a horizontal motion in the mast. I have seen TV news shots of wind damage where the outer skin of a cavity wall has been sucked out and not pushed in to close the cavity!
    • CommentAuthorJonti
    • CommentTimeNov 24th 2013 edited
    The 1265' TV mast at Emley Moor, Yorkshire collapsed at 5.01pm on 19th March 1969 due to accumulation of ice on the support wires.

    Did it collapse twice?

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