Author Topic: Beam for 1 1/2 story home.  (Read 5457 times)

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Offline schiada

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Beam for 1 1/2 story home.
« on: October 05, 2011, 02:40:59 PM »
So do I have the layout right.


Offline John Raabe

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Re: Beam for 1 1/2 story home.
« Reply #1 on: October 05, 2011, 03:24:34 PM »
Stagger the joints in the 2x12's by 4'. The plywood is just to flush out the beam to standard bracket dimensions
None of us are as smart as all of us.

Offline schiada

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Re: Beam for 1 1/2 story home.
« Reply #2 on: October 05, 2011, 04:34:03 PM »
All 4'. That is what I have here. So we should be good to go. [cool]

Offline CjAl

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Re: Beam for 1 1/2 story home.
« Reply #3 on: October 05, 2011, 05:05:59 PM »
No you have your.plywood.joints stagered.4'. Your 2x12's have all the joints in the same place. Its your 2X's that matter, the plywood can be anywhere

example:
My posts are going to be 8' apart. So i will use 16' 2x12s.

First row will.be 16'-16'

Second.row i cut one in half so i go 8'- 16'- 8'

Third row is back at 16'-16'

That way the joints are stagered and all the joints sit on top of a post
yours may not work out as evenly as mine depending on your pier width but i like to try n keep all my joints on the pier, or post.

Offline Don_P

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Re: Beam for 1 1/2 story home.
« Reply #4 on: October 05, 2011, 05:46:06 PM »
There is no try, do 

(make all splices in the 2x's over supports)

aplogies to Yoda  :)

Offline schiada

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Re: Beam for 1 1/2 story home.
« Reply #5 on: October 05, 2011, 07:43:57 PM »
Will need to do more! Not try! d*

So the plywood is just a filler? Seams don't mater?

The piers are a every 6'.

Offline schiada

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Re: Beam for 1 1/2 story home.
« Reply #6 on: October 05, 2011, 08:20:46 PM »
Looks like it cant be done with 6' spacing. ??? ??? And end over piers. d*
Will need to try 18' 2x12? Do they make 18' 2x12??? ::)
Nop, just wont work.


Offline Don_P

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Re: Beam for 1 1/2 story home.
« Reply #7 on: October 06, 2011, 01:57:11 AM »
They do make 18' 2x12 but at 6' pier spacing 12' material works. 1st ply of 2x starts with 12', next ply of 2x starts w/ 6' third ply starts w/ 12'. This knits the plies over the posts. Plywood is just filler but does help to knit the joints.

Offline CjAl

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Re: Beam for 1 1/2 story home.
« Reply #8 on: October 06, 2011, 05:55:43 AM »

12-12-6

6-12-12

12-12-6 or 12-6-12, either will work.

You can have two of the three joints in the same place as long.as its on a pier and they.are not right next to each other.

Offline John Raabe

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Re: Beam for 1 1/2 story home.
« Reply #9 on: October 06, 2011, 06:52:14 AM »
DonP and CjAl are giving good advice. If you can get all the joints in the built-up beam to land on supports then any ability of the nails and adhesives to bond the beam into a working unit is pure gravy. If you are building a generalized beam of uncertain support spacing the 4' overlap in 2x spacings gives you a good working distance for the nails to do this bonding.
None of us are as smart as all of us.

Offline schiada

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Re: Beam for 1 1/2 story home.
« Reply #10 on: October 06, 2011, 07:07:35 AM »
Stager.Ok that will work.  ;)

12-12-6

6-12-12

12-12-6 or 12-6-12, either will work.

You can have two of the three joints in the same place as long.as its on a pier and they.are not right next to each other.

Offline CjAl

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Re: Beam for 1 1/2 story home.
« Reply #11 on: October 06, 2011, 07:12:11 AM »
Now that that is resolved let me ask. I am good to go with the tripple 2x12's extending out 9.5" beyond the edge of my outer most piers right?  or does the rule about being able to extend the same as the width of the board not apply to the main beams?

Offline schiada

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Re: Beam for 1 1/2 story home.
« Reply #12 on: October 06, 2011, 07:35:52 AM »
something like this?


Offline Don_P

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Re: Beam for 1 1/2 story home.
« Reply #13 on: October 06, 2011, 04:12:03 PM »
If one ply of the plywood was treated 1/2", extended down out of the girder and had a frame of 2x4's it would be a well tied brace in the direction of the girder.

Offline John Raabe

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Re: Beam for 1 1/2 story home.
« Reply #14 on: October 08, 2011, 03:20:34 PM »
Great idea Don! [cool]
None of us are as smart as all of us.

Offline schiada

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Re: Beam for 1 1/2 story home.
« Reply #15 on: October 08, 2011, 04:39:11 PM »
I will be using a system like this. Seam Don's way would not work?

 

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