large Panels

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Forum topic by mggraphix posted 09-21-2012 02:40 PM 767 views 0 times favorited 3 replies Add to Favorites Watch
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24 posts in 2396 days

09-21-2012 02:40 PM

Hi All,

I have to manufacture some large panels for signage. Panels are about 10 feet wide x 8 feet high x 1.5” thick.
Western Red cedar VG, laminated using approximately 1.75” continuous sections. The architect has specked an end strip about 2” wide running vertically up the sides to hide the end grain. (perpendicular to the grain of the main panel.) He has specked it to be glued and screwed every 8” on center. I was thinking that expansion on this panel could total up to about 3/4” – 1”. Am I way off on this assumption? I have not worked much with WRC VG especially on a panel this size. I was thinking of offering a breadboard design to these ends. These panels will be manufactured and installed in the Northeast US. Mounting will be to 3 steel 4×4 using keyhole bracketry. Stained finish. I was wondering if I could get some opinions on this.

Issue number 2:
2 panels will be mounted to one set of steel 4×4 posts (3 total posts) on opposite sides. The space between the panels (where the posts are) will be enclosed with more cedar. Only one surface of each panel will be exposed to sunlight while the other side will be forever hidden. The 6 keyhole brackets will be all that is supporting each panel. I feel that the there may be more support needed in the field of the panel to resist any cupping due to the sunlight constantly hitting the face.

Thanks for any help on this…

3 replies so far

View HerbC's profile


1763 posts in 2883 days

#1 posted 09-21-2012 03:26 PM


I would definately address these concerns to the architech and if necessary to the end customer. You don’t want to waste good material and all your labor just to have the project self-destruct once it’s installed, which I believe will happen with the design you’ve described.

Good Luck!

Be Careful!


-- Herb, Florida - Here's why I close most messages with "Be Careful!"

View Lee Barker's profile

Lee Barker

2170 posts in 2874 days

#2 posted 09-21-2012 03:56 PM

+1, Herb.


-- " his brain, which is as dry as the remainder biscuit after a voyage, he hath strange places cramm'd with observation, the which he vents in mangled forms." --Shakespeare, "As You Like It"

View mggraphix's profile


24 posts in 2396 days

#3 posted 09-23-2012 12:35 AM

Thanks for the second opinion.


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