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What is a reasonable lifespan?
How long does our responsibility for the life of a sign last?
Three years ago I fitted a new set of panels into an existing sign frame and recent storms blew (or more correctly sucked) the panels out.
The company initially asked me to replace the panels and add a plywood backing to the frame to ensure the panels stayed in place. I patiently explained that my understanding of this type of failure is that when a high wind passes over the face of the sign, this causes an area of low pressure which then causes the panel to be sucked out of the frame (this is the same principle as that which causes "lift" on an aircraft wing). Consequently, the fitting of a plywood backing behind the frame may not prevent a recurrence.
I suggested a better alternative to prevent a possible recurrence would be to remove the frame altogether and attach aluminium composite panels directly to the building and quoted them a price to do so.
Their response was to more or less accuse me of "designing" a sign system that was not fit for purpose and why should they pay me to remove old frame and fit new composite panels.
I pointed out that the frame was historical – I merely saved them money at the time by utilising an existing system when fitting new panels. The fact that this has proven to be problematic is not my doing.
They have had three years use of a sign – recent storms have caused this damage and I think it is unrealistic to expect that I am still responsible for the condition of the sign.
Unfortunately there was a recent case where a 10 year old sign came down causing severe injury. The sign company involved were held jointly responsible and received a hefty fine. The BSGA held this case up as an example where the industry is failing and there was a need for higher standards.
Who’s right? And how far is it reasonable to go to ensure signage remains in tip top condition some years after fitting?
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