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6mm ACM or 5mm AlumaCorr?

Discussion in 'General Signmaking Topics' started by Pixels Are Bad Mmmkay?, Feb 20, 2020.

  1. Pixels Are Bad Mmmkay?

    Pixels Are Bad Mmmkay? Very Active Member

    We've got a project coming up for a 4' x 8' double-sided sign. We are just quoting to make the sign and the client in this case, a local municipality, is building their own frame from 6" x 6" posts with 4" x 4" horizontal stringers. They plan on cutting a 1/4" notch 1" deep into the top and bottom stringers, as well as the 6" x 6" posts to secure the sign around all four sides.

    Initially, my first instinct was to quote 6mm MaxMetal ACM, but then I have to wonder, is 5mm AlumaCorr better suited for this job? I would think 6mm ACM would handle wind loads better but perhaps I'm wrong. Grimco either doesn't have a tech department or they couldn't give me a straight answer, whatever the case, and I see this AlumaCorr material used in other similar applications where a 4' x 8' is surrounded by a frame of some sort. I've heard that AlumaCorr is incredibly strong, especially considering its weight, but is it stronger than ACM?

    I would appreciate any insight as to what you guys feel is the best and strongest material for this type of application or if I could really go either way.
     
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  2. Christian @ 2CT Media

    Christian @ 2CT Media Major Contributor

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    It comes down to an old engineering idea, is solid stronger than an arch? In your case both would work suitably
     
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  3. unclebun

    unclebun Very Active Member

    For a sign that's only a 4x8, held by the edges, you can use 3mm ACM, 6MM ACM or Alumacorr. They are all strong enough.
     
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  4. Pixels Are Bad Mmmkay?

    Pixels Are Bad Mmmkay? Very Active Member

    I wouldn't use 3mm in this case. It's a sign for a baseball diamond without a lot of surrounding trees or buildings so it's what I would definitely call a potential high wind area.
     
  5. d fleming

    d fleming Very Active Member

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    I would be more skeptical of a 1/4" gouge holding it in place. I have had our shop sign flex and disappear in severe winds (strong storm for us is hurricane for everyone else,lol) and that was held in place with 1x2 fir strip. Frame stayed, sign never found.
     
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  6. Gino

    Gino Premium Subscriber

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    He said a 1/4" wide by 1" deep notch/groove.

    For a 4' x 4' sign, I'd use either or. For a 4' x 8', I'd be using 10mm alumalite.
     
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  7. wes70

    wes70 Very Active Member

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    Either of those would work, but if it was me, I'd go with the 6mm acm.
     
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  8. JBurton

    JBurton Signtologist

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    I'm of the opinion that 3mm and 6mm are equally strong, the difference is how many screws you need to hold it up, 6mm requiring more due to gravity alone. I can safely say that doubling the amount of recycled plastic does not make it stronger, just heavier. The only reason we use 6mm is if it a face replacement in an old lit cabinet that is no longer lit, or if it dimensional letters cut out and mounted to a panel.
     
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  9. wes70

    wes70 Very Active Member

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    I understand what you are saying if it was too be mounted on a wall or had some back support (stringers, plywood, etc.) but from what I understand the sign will be "floating" in the grooves...sorta like shaker cabinetry.
     
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  10. Texas_Signmaker

    Texas_Signmaker Very Active Signmaker

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    6mm is good.
     
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  11. JBurton

    JBurton Signtologist

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    Oh, yeah I'd meant to say that while it may work better here since the groove would be cut too wide for 3mm, I'd probably push for a more structural panel, 6mm corrugated with 020 faces or something would be ideal. But I've gotten so tired of my salesmen selling 6mm acm for no reason, that I made them a flow chart! Feel free to tell me how I can improve it...
     

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  12. Gino

    Gino Premium Subscriber

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    I pulled a muscle in my head with that one........................ o_O
     
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  13. Texas_Signmaker

    Texas_Signmaker Very Active Signmaker

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    Go see Jace
     
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  14. Zendavor Signs

    Zendavor Signs Member

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    I would recommend 6mm ACM. I didn't know people were still using Alumacorr anymore. I recall the material often having a wavy looking face. It just always looked so cheap. As ACM became more popular, I saw it as the natural upgrade from Alumacorr.
     
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  15. Pixels Are Bad Mmmkay?

    Pixels Are Bad Mmmkay? Very Active Member

    This is correct.

    This is what I thought but I see a lot of it in existing sign frames and of course that drove my curiosity. I wasn't aware of the wavy appearance though, so that's good to know.
     
  16. Texas_Signmaker

    Texas_Signmaker Very Active Signmaker

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    I don't get the Alumacor appeal at all. Other then it weighing less, that stuff dents easily and I don't like the paint job on it AND it's more expensive. 6mm ACM feels as sturdy as MDO without all the drawbacks and for the best price.
     
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  17. Notarealsignguy

    Notarealsignguy Very Active Member

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    its a 5 year sign tops. Dont over think things, 6mm acm is fine. Could probably even get by with 3mm with a smaller channel.
     
  18. Gino

    Gino Premium Subscriber

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    So, whatever happened ??
     
  19. Pixels Are Bad Mmmkay?

    Pixels Are Bad Mmmkay? Very Active Member

    We used 6mm ACM and the city workers made a pretty up to snuff frame to put it in. We had hella high winds rip through here yesterday and it's just fine. It's so ironic that you brought this up because they just got it put up about three weeks ago and I finally got around to driving out to the park to get a photo of it, then came home and saw this post. You stalking me, Gino?
     

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  20. RaymondLoewy

    RaymondLoewy Pretty fly for a Sign Guy

    So. . . . who is going to paint the posts and not ruin your work??
     
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