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Old 07-04-2012, 08:11 PM   #1
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beam span when laminated


Looking at wood beam span tables for a deck i can go roughly 14' between posts when the posts are 8' high and the deck is made up of 3-2x12 laminated together. Can anyone tell me how much further I can go between posts if I laminate in 2 pieces of 3/4 inch treated plywood between the 2x12?

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Old 07-04-2012, 08:17 PM   #2
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beam span when laminated


you would be better setting a quad instead of plywood in the beam, plywood has breaks every 8' so would lessen strength considerably at the breaks.

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Old 07-04-2012, 08:25 PM   #3
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beam span when laminated


I don't have any spans on tables I have found on the net for a 4x beam. I need to go 16' on one side of the center post and 23' on the other side. Will a 4x beam handle that?
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Old 07-04-2012, 08:44 PM   #4
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beam span when laminated


A 4 X beam will sag, twist and check.
Plywood would also rot with the end grains laft exposted between 2 X's.
Far better to just add more supports to shorten up the spans.
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Old 07-04-2012, 08:53 PM   #5
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beam span when laminated


Go steel or a glulam beam
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Old 07-04-2012, 08:54 PM   #6
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beam span when laminated


Have an architect or engineer spec a treated glulam.
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Old 07-04-2012, 11:15 PM   #7
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beam span when laminated


These links might be of use:

http://www.johnbridge.com/vbulletin/deflecto.pl

http://www.woodbywy.com/services/s_forte.aspx

http://www.hsh.k12.nf.ca/technology/...e_11/index.htm

You can use the Forte software (free from Weyerhaeuser) for more than just I-joists.
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Old 07-05-2012, 07:02 AM   #8
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beam span when laminated


Quote:
Originally Posted by billybarty View Post
I don't have any spans on tables I have found on the net for a 4x beam. I need to go 16' on one side of the center post and 23' on the other side. Will a 4x beam handle that?

23' is a long way to span with regular 2x lumber. you would need an engineered beam for that span along with a qualified engineer to recommend the beam sizing. if possible, a post for each mid span from center looks like the way to go...


Last edited by hand drive; 07-05-2012 at 07:05 AM.
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