posted
Would a 10'x7'single sided sandblasted HDU sign need some type of backer? The sign is to be mounted against a wall of pylons. Seems like someone here mentioned laminating a piece of alumalite or something onto the back? I believe that the SignFoam How-To Book says to face-screw it and fill the holes. This doesn't seem strong enough for a sign of this size.
Thanks for the help.
------------------ "autograph your work with excellence"
------------------ St.Marie Graphics & Makin' Tracks Sound Studio Kalispell, Montana stmariegraphics@centurytel.net http://www.stmariegraphics.com 800 735-8026 We're chiseling every day of the week! :^)
posted
Sorry Pierre, I'll be using 15lb density so the sign in 1.5'' HDU will weigh approx. 100.39 lbs.(45.54 kilograms) and a 2'' one will weigh approx. 137.5 lbs. (62.37 kilograms)
The sign is elliptical in shape.
Come to think of it, that's not a lot of weight. But, being that large, it could get a little flimsy. What do you think?
Thanks
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Not sure you stated how far the pylons were apart, which could make a difference.
We used treated 2 x 12's for backing on the last sign we did.
------------------ Draper The Signmaker Bloomington Illinois USA My Next Article In The April Issue of Sign Builder Illustrated covers step by steps on "digital airbrushing" YOU CAN DO! 309-828-7110 drapersigns@hotmail.com Draper_Dave on mIRC chat
Posts: 2883 | From: Bloomington Illinois USA | Registered: Nov 1998
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posted
Hey Dave, There is no space between the pylons because it's like a solid wall of them. I don't know how far apart their tangents will be but I assume the posts are either 6'' or 8'' diameter. I have alot of trouble with PT wood warpage down here in Florida.
------------------ "autograph your work with excellence"
posted
Definitely need backing. 1/2" MDO is ok, but I'd use 5/8" or 3/4" anyway. Just make sure you make your backing joints in opposition to the HDU joints. Use a good HDU adhesive like PB240 or Gorilla Snot or whatever you call it. (Gorilla Snot is what we use in the recording studio for guitarists and drummers)
If you use something like PB240 you won't need screws at all. Do NOT prime or paint the two sides to be joined by the adhesive. Leave it raw wood and HDU. Make sure the MDO is single sided and turn the raw wood part to the inside against the HDU. Let me know if I can help any further. HDU is our "thing".
------------------ St.Marie Graphics & Makin' Tracks Sound Studio Kalispell, Montana stmariegraphics@centurytel.net http://www.stmariegraphics.com 800 735-8026 We're chiseling every day of the week! :^)
[This message has been edited by pierre (edited April 10, 2001).]
If the Signfoam is bolted down to a solid wall, I can't see where you would need any backing. Just bolt it up and go home.
I have Signfoam on brick walls with no backing, they are dong fine. I have 2 with just 1 2x4 running horizontaly on the back side of the sign (sign between posts) to keep it from flexing in the wind.
If Signfoam can start flexing in the wind, then it will crack down the middle. If it is up against a wall, then there is no wind problem and no need for a stiff back board as your pylons should provide that.
------------------ Draper The Signmaker Bloomington Illinois USA My Next Article In The April Issue of Sign Builder Illustrated covers step by steps on "digital airbrushing" YOU CAN DO! 309-828-7110 drapersigns@hotmail.com Draper_Dave on mIRC chat
Posts: 2883 | From: Bloomington Illinois USA | Registered: Nov 1998
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posted
Not to be arguementative, but 1.5" in that size is simply not strong enough. Suppose it takes any kind of a hit or good push between the 2x4s? It's only 15# material. Why roll the dice on something that large and shallow?
------------------ St.Marie Graphics & Makin' Tracks Sound Studio Kalispell, Montana stmariegraphics@centurytel.net http://www.stmariegraphics.com 800 735-8026 We're chiseling every day of the week! :^)
posted
Thanks Dave, I don't see why directly attaching the sign to the pylons wouldn't be sufficient. Do you just countersink screws into the face to attach?
Will there be alot of expansion/contraction in relation to the wood on a sign of this size?
Thanks Pierre, would the 2'' 15# that I mentioned be thick enough or should I go with something thicker with 18# density?
------------------ "autograph your work with excellence"
------------------ St.Marie Graphics & Makin' Tracks Sound Studio Kalispell, Montana stmariegraphics@centurytel.net http://www.stmariegraphics.com 800 735-8026 We're chiseling every day of the week! :^)
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