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Large sign Support – Recommendations
We are just pricing to produce and install a large sign for one of our developer clients on their proposed housing site, so the sign will stand in an open field.
The sign will be 3 x 8ft x 4ft panels stacked on top of each other, using 3 x 114mm aluminium posts, which we will concrete into ground.
For extra security from wind etc we would like to add supports to the main posts, but cannot find anything that would help with this, was thinking of a a scaffolding knuckle and post into the ground behind, but they don’t have the diameter.
Do want to get into fabricating with wood etc
Any ideas or recommendations please.
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6 Replies
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Windload Calculator says:
2440w x 3660h panels with a mounting height of 1200 require 3 x 140mm or 2 x 168mm posts.
1800 mount height upwards would require 4 x 140mm posts.
If you have the correct post diameter sunk to the correct depth no extra support would be required imo.
( but i understand the belt and braces way of thinking) -
I would use Steel poles as opposed to the aluminium ones you are opting for.
Get plastic dipped or galvanised steel poles. The sign is in a feild so i assume from location and size it is being viewed from a distance. So i see little benefit of using aluminium other than weight and weathering. anyway, i would opt for the stronger option and you should save a bit of money buying them in too. -
Uni Clamp brackets are available in 114mm. You could use these to attach a brace of some description.
As above.. I’d use galv steel posts. -
Agree with with above and was going to mention to use steel, preferably galvanized, but costly.
Alluminium could potentially snap at ground levelThe few jobs we have done like this over the years have all been with steel posts.
I remember our supplier of posts at the time followed us round the M25 to a job years ago with 6mtr posts on his flat bed which went above his cab because of the length of them.. It looked like a mobile missile launcher.. :shocked: . I was glad when we arrived on site.
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I would get an engineer to sign off on big stuff like that.
Just for peace of mind. -
You could also consider using larger diameter steel poles. We’ve used 200mm dia steel poles for very large signs. Concrete bases – formed as trenches at 90 deg to the face of the sign. You could throw some re-bar in there too to make sure.
It also depends on what material you are using for the sign panels and how thick. And also what type/size of backing rails and how you fix them to the sign panels.
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