How to mount 1 inch HDU routed sign to 4x4 post

[bpatrick3]

Was wondering the prferred method for mounting 1" HDU signs 18"x24" to single 4x4 post.
Thanks

 

[GaSouthpaw]

I'd suggest an .080" or .125" aluminum backer to attach to the post. Glue/mechanically affix the HDU to the aluminum.

 

[Gino]

Yowsa, that's really taking a chance. The aluminum backer is a good idea, but at least use some sort of backing piece. Otherwise, some kid will knock it off or break it off just riding by on his bicycle.

 

[Billct2]

Yep, definitely need a backer panel of some kind. I'd probably use a piece of .080 since I usually have leftovers.
For a clean look mount screw and glue the 080 to the post and then screw and glue the HDU to the .080, srcews going thru the back of the .080.

 

[stripe52]

I take light weight aluminum angle iron, and glue and screw to back of HDU. Place them vertically in position leaving 3-1/2" space for the 4 x 4, then screw thru the angles into the post.

 

[bannertime]

I take light weight aluminum angle iron, and glue and screw to back of HDU. Place them vertically in position leaving 3-1/2" space for the 4 x 4, then screw thru the angles into the post.

I don't ever work with HDU, so I'm legitimately curious about this. Is HDU sturdy enough that it doesn't need support on the edges? I know it's pretty tough, but I can't help but think some kid ramming a shoulder into it and breaking it in half.

And before some tries to say "that wouldn't happen," I speak from experience that it does happen.

 

[ams]

I've used Dowels before

 

[letterman7]

.080 or 1/2" MDO as a backer.

 

[Billct2]

Yes, it will snap. That's why this install especially should have a full solid backer of some sort.
But since this is a year old maybe the OP could fill us in on what they did.