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Old 08-18-2012, 12:16 PM   #1
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Balcony beam


Hello, need help, I'm building a balcony, I have a span between 2 4x4. The span is 11' 5 1/2". Would it be safe to use treated 2x8x12 sandwich together with 1/2 osb for this span? Living in N.M.

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Old 08-18-2012, 01:23 PM   #2
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Balcony beam


how long are the joists and the height of the deck off of the ground? Thanks

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Old 08-18-2012, 02:06 PM   #3
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Balcony beam


Hello Hand Drive, thank you for reading my post. The joist are 5'7" and the height will be 6'7".
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Old 08-18-2012, 03:30 PM   #4
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Balcony beam


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Originally Posted by kaiden View Post
Hello Hand Drive, thank you for reading my post. The joist are 5'7" and the height will be 6'7".

NP, you will need 2 -2x10 for the beam and 6x6 posts with the beam notched into the posts from one side. Please do not use osb outside on a deck...
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Old 08-18-2012, 03:35 PM   #5
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Balcony beam


If your deck live load is 40psf and dead load 10psf max, the total load on your 12ft span beam will be about 1650lbs.
If you use 2no. 2x8s , the bending stress in them will be between 1000 and 1100lbs /sq in. Most structural softwoods are in the range 800 - 1200 lbs/ sq in.,so assuming these loadings, you are probably near the limit.
I would be inclined to use 2 no. 2x10s to be on the safe side.



PS Just noticed HandDrives post;yes, no need to use OSB, and 6x6 posts more sturdy than 4x4.

Last edited by tony.g; 08-18-2012 at 04:05 PM.
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Old 08-18-2012, 11:17 PM   #6
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Balcony beam


Do I need to sandwich the 2x10 with something or just put them together with nothing in between.
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Old 08-18-2012, 11:25 PM   #7
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Balcony beam


Thank you Tony G. and Hand Drive for your knowledge, are the joist 2x6 ok.
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Old 08-18-2012, 11:42 PM   #8
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Balcony beam


Kaiden,

see Table 2 on page 3, it will give you the spans based upon the species of wood you are using and the spacing of the joists. Hope this helps.

http://www.awc.org/publications/DCA/DCA6/DCA6-09.pdf
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Old 08-18-2012, 11:46 PM   #9
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Balcony beam


Anytime you think you can get by with 2 X 6's Use 2 X 8's. What good is it if the whole thing sags and bounces?
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Old 08-19-2012, 10:01 AM   #10
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Balcony beam


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Do I need to sandwich the 2x10 with something or just put them together with nothing in between.
Not necessary (or desireable) to sandwich anything inbetween. Just bolt/screw them firmly together to help them act as one beam.
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Old 08-19-2012, 10:32 AM   #11
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Balcony beam


Run a zig zag of glue between the beam also if you have it. 2x6 joists for 6 feet is fine, but if it was mine i would go 2x8 joist and 2x10 even 2x12 for beam if you dont care about head room underneath.
6x6's for anything over 3 ft off the ground if it was me also...4x4's can go bananas (literally look like a banana lol)
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Old 08-19-2012, 10:43 AM   #12
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Originally Posted by tony.g

Not necessary (or desireable) to sandwich anything inbetween. Just bolt/screw them firmly together to help them act as one beam.
I had a similar situation and used 1/2" treated in the sandwich but i was also using Simpson brackets to join the beam to the post and that required a 3 1/2" beam. How are you joining the beam to the post? Check out
http://www.strongtie.com/products/ca...ml?source=home
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Old 08-19-2012, 11:20 AM   #13
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I would use a small chunk to fill in the xtra 1/2" at the bracket, I like to have nothing in between unless i had to.
But for this situation i would notch to 6x6 for the beam and thru bolt.
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Old 08-19-2012, 04:29 PM   #14
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Balcony beam


Thanks guys, you all been alot of help, I really like this "DIY" my wife thinks I'm smart..lol.. One more question,,, If you all don't mind. If I am looking for head room, and I have a 11'7" span the height is 6'6", this is going to be a small shop under my boys club house, I'll have 8 joists. I would like to use two 2x6 together on all 8 joist, I know 2x8 or 2x10 would be better, but I need head room. My question is, are two 2x6 together stonger than 1 2x8??

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