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Old 01-29-2011, 02:39 AM   #1
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Best way to cover a 14' span?


I am building a 14'x5'4" loft room in my living room. It will be anchored on 3 sides by support walls.

The open end is 14' across. I plan on putting a long beam in a BIG Simpson hanger on each end.

What's the best wooden way to span that distance?

I have been told that sistering 2 2x10's (fir) with a strip of plywood glued and screwed between them is the way to go.

Is this better than using a fir 4x10x16 cut down to 14'?


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Old 01-29-2011, 06:35 AM   #2
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Best way to cover a 14' span?


Can you post a sketch of what you are trying to do?

I don't think you are trying to do anything to difficult--I don't have a span chart handy--one of the framers will,however.--Mike--

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Old 01-29-2011, 04:25 PM   #3
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Best way to cover a 14' span?


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Old 01-29-2011, 05:41 PM   #4
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Best way to cover a 14' span?


Engineered lumber, like they use over a 2 car garage door.


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Old 01-29-2011, 06:43 PM   #5
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Best way to cover a 14' span?


What weight is it expected to hold?
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Old 01-29-2011, 09:48 PM   #6
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Best way to cover a 14' span?


I'm not sure how much weight it will hold. Only for maybe 2 people and a desk. It's going to be small den/computer/man cave.
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Old 01-29-2011, 09:58 PM   #7
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Best way to cover a 14' span?


You will get many responses to this I am sure, a wise piece of advice, is to consult with an engineer, do a hand sketch, take it to a design house/engineer and have them review it, might be the best $100 bucks you ever spend.

I say this based on your last response, you don't know how much weight, there are minimums you must follow to meet building codes.

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Old 01-29-2011, 11:51 PM   #8
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Best way to cover a 14' span?


I wouldn't do the expensive beam, I would ledger three sides with 2 x 10s then hang 10" hangers off the short ends and install 2 x 10 the long way with a double 2x 10 and hangers on the out side edge.

You are within the span tables for residential sleeping areas with 30 lb. live with #2 DF.

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Old 01-30-2011, 01:08 AM   #9
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Best way to cover a 14' span?


If you were in Canada:

  • 4-2x10 SPF No.1&2 can span 14'-1"
  • 3-2x12 SPF No.1&2 can span 14'-11"
Built-up beams are fine for a dropped beam, but for a flush beam consider using engineered lumber, like an LVL. Some lumberyards can spec for you.

edit: didn't read Gump's post. AndyGump's way could be cheaper and easier.

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Old 01-30-2011, 08:25 AM   #10
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Best way to cover a 14' span?


Have you in investigated "box beams"? I have used them and they are quite strong --- and light. Check it out.
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Old 01-30-2011, 01:25 PM   #11
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Best way to cover a 14' span?


I am in Hawaii and will be using FIR.

Is there any advantage to sandwiching a glued and screwed strip of ply between the 2 2x10's?

I've been told the criss cross grain adds some additional strength and helps prevent bowing.
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Old 01-30-2011, 02:01 PM   #12
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Best way to cover a 14' span?


Quote:
Originally Posted by thomaszr View Post
I am in Hawaii and will be using FIR.

Is there any advantage to sandwiching a glued and screwed strip of ply between the 2 2x10's?

I've been told the criss cross grain adds some additional strength and helps prevent bowing.
Plywood sandwiches will add more stiffness than strength but thats good in this case. I think an engineered wood beam would also be good and give you the choice of direction for the other joists.
As far as weight, allow for 40# live load and 10# dead load for the kind of use you mentioned. Thats per square foot btw
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Old 02-02-2011, 01:53 AM   #13
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Best way to cover a 14' span?


Honestly- can you spare roughly 3in lower? IF you can do it out of 2x12 you can glue a piece of ply but not needed. A doubled up 2x12 then hangers will hold that any day of the week. You can still run your 2x10 joist just make the ledger on the outside 2x12

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