Mounting 4' x 4' panel sign on parking lot light pole?

If the light standard wasn't installed to hold anything but a light, I highly doubt you'll find anyone willing to give you a permit to hang a sail on it, let alone an engineered stamped drawing for it.

You might hafta rethink your installation altogether.

Can't really recommend something which doesn't meet any codes.

All this goes double for the Windy City.​

 

Agree with Gino. We install small signs, like 18"x24" on parking lot light poles, and they sometimes twist a little in a good storm.
I'd suggest light pole banners instead.

 

Gino is spot on. Town where I live wind load calc is based on 30lbs per square foot. You'd be at 480lbs.

 

As already stated by Gino and verified by others, you want to make sure the pole can handle the extra stress. I have worked on quite a few municipality wayfinding projects where the poles had to be verified. We always called out Signfix by Idex and they worked like a charm...

 

Check with your local code, some places don't allow any signage to be affixed to a light pole. See if it's a public light or private.

 

Why would the rules change according to public vs. private ??

 

I would not do that. Maybe you can get away with a much smaller sign but a 4'x4' would be a no-no.

 

If it's the city's street light along a road, you can't put anything on it. If it's a shopping center's light in a parking lot, they can.

 

As far as having a blanket permit in a mall or shopping center, yes....... but the rules still apply for wind shear and whatnot, regardless where the sign is gonna go. If it's going out in your back yard, you'd be a fool to put a 4' x 4' sail on a light standard without thinking it thoroughly through, first.

 

Are they round or square poles? On round the Signfix or similar will work. On square poles with two signs back to back thru bolts right up against the pole will work.

 

I'd add, through bolts while being EXTREMELY careful drilling your pilot holes to not pierce the wiring for the lights.

 

Get some flared leg saddles and some 3/4" strap and strap that sign up on the pole. We make signs this large all the time and the city installs with band and buckle on light poles. We made some 48x72 wayfinding signs in .125" aluminum. They go on a 4" pole with sign fix channel and bracket.

 

Did you happen to notice where the OP is located ?? Do you know that city's nickname ??

 

Sorry, that wasn't clear, not bolts thru the post, just the signs. We drill 4 holes on the pair of signs just wider that the square post.
Then pinch the signs to the post with the bolts.

 

I read somewhere and sometime back where the Chicago newspaper wrote long articles and someone mentioned it was a windy city, meaning like noted in quote on being long winded so the term windy city came about.
If the signs are mounted right with sign fix hardware and not too large (2'x2') it will work on the light poles in a parking lot for identification purposes.

 

I recommend doing pole banners. Here is a link for round poles: https://metalcraftindustries.net/banner-bracket-kit-for-round-poles-choose-options-for-pricing/