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Posted By lee boylan
Hello All,
I am currently writing a procedure for our staff and 3rd party contractors for roof access to ensure conditions are safe for them to work on a roof.
At current if the wind speed is above 13 Metres per second (29 Miles per hour)they can't draw the door key for the roof.
What maximum standard do you have for wind speed on your sites, as I think 13 Metres per second is quite high.
Thanks
Lee
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Posted By Ron Hunter
Check out the National Federation of Roofing Contractors Ltd publications on their website.
The figures they quote (and the permissible max & average wind speed varies depending on the nature of the task)are widely accepted across the Industry and form the basis for resolution of contract delays etc.
£10 for non-members as I recall - a snip!
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Posted By A Campbell
Interesting concept as to defining a maximum windspeed for allowing workers onto roofs....
Is there a device for measuring the speed installed or would someone have to go up onto the roof to take a measurement with a hand held Anemometer?
Other aspects would be... the route taken to gain access...ladders verses stairs, guard rails in place, walkways, fall protection devices requied, area of roof required to access etc.. and of course the task... is the wind speed a hazard for that too!
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Posted By graeme12345
Lee used to be (all in MPH)
sheeting/decking 23mph
slating / tiling = 23mph
built up felt = 23mph
mastic = 23mph
cladding 2m's above roof level = 23mph
if you are fixing or handling sheets longer than 5 mt's more than 2 m's above the roof level then it will be 17mph
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Posted By Mike B
Lee, bear in mind that wind gusts can exceed the mean speeds by a factor typically of between 1.5 and 2.0.
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Posted By peter gotch
Lee the guidance that Ron refers to is "Roofing & Cladding in Windy Conditions". Current edition 2006, but has been around since 1982 when the limits were in Knots.
In addition to the limits, guidance indicates that extreme care required if handling e.g. rolls of felt when the average mean wind speed reaches 17mph.
You also need to consider the nature of the building. On high risk buildings the wind can impact such as to pull (rather than push)you towards the edge.
P
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Posted By Ron Hunter
Whilst anemometers are ideal, the old Beaufort scale indicators for leaves, trees and branches is OK for the lesser heights. I've been on the top of the 15 storey tower blocks though and that can be a bit scary - I would suggest an anemometer with a gust/averaging and weather-cock head would then be a necessity most of the year.
The Guidance I referred to has tables which relate to beaufort indicators as well as giving specific wind speeds.
Remember too that the Work at Height Regulations (2005) now include specific requirements regarding weather conditions.
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