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Discussion Starter #1
I am in the process of adding an game room onto my house, the room is 25 1/2' x 25 1/2' my question is how do I run my ceiling joist over such a large area, the longest wood I can find is 16' long
 

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Civil Engineer
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You are correct, it is going to be very difficult to find a single board that is 25 1/2 feet long, certainly not at the local Home Depot. So here are a few options:

1. You can use engineered lumber, for example Georgia Pacific Wood I Beam Joists. These joists are available standard in lengths starting at 24 feet, up to 48 feet.

2. You can use a wooden truss system, which is available in long lengths.

3. You could use steel I beams, which can be custom ordered to the proper length, pre drilled for bolting.

In any case, you are going to need to have the joists designed for your loading. If you are using an architect to design the room, he can do the design, or he might hire a structural engineer to do the design. If you are designing this yourself, I recommend you hire a registered professional structural engineer for purposes of sizing the joist, and designing the hanger system. If you elect to do the design yourself, you may not be able to get a permit for the project. Assuming you need a permit, building without one would be real trouble.
 

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I used I-joists to span 19'
They were not really as expensive as I thought
I actually went to the next highest size for a stiffer floor/ceiling
Local lumber company sized them (free) & had it stamped for permit
And were lighter then 2x lumber
They went up fast & I was very happy with the results

 

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Mold!! Let's kill it!
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Is it single story or 2 story? For a single story, use trusses for the roof. The bottom chord of the truss will carry your ceiling. No problem for a span that size. For a 2 story, you'll need to use an engineered floor joist system like mentioned above.
 

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Discussion Starter #5
Thanks for the info, It's going to be a single story and I really don't want to use trusses, I was thinking engineered lumber, one beam down the middle then run 2x6 joist would be about a 12.5 foot span.
 

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Thanks for the info, It's going to be a single story and I really don't want to use trusses, I was thinking engineered lumber, one beam down the middle then run 2x6 joist would be about a 12.5 foot span.
I have framed a few room additions and garages over the years - always stick built the roof structure until the last one with trusses. I much prefer the trusses. And surprizing reasonably priced with a bit of shopping around.
 

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Lic. Builder/GC/Remodeler
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I am in the process of adding an game room onto my house, the room is 25 1/2' x 25 1/2' my question is how do I run my ceiling joist over such a large area, the longest wood I can find is 16' long
As stated: Use engineered wood I joists that are calculated for the span.
 

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Dave, your LVL trimmers are going through the ply floor........You forgot the bearing blocks in the floor below. Going to have some wall board cracks.....

Joldfield, why not 26x26'? You are losing almost 26 square feet, and you already paid for it. That's a 6'x4' room. Be safe, G
 

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Discussion Starter #13
Thank you all for your great info,the room was actually supossed to be 24 x 27 but the concrete guy kinda messed up but the slabs already poured so i got 25.5 x 25.5 , anyway i will try to find a lumber yard here in houston whocan build me a I-Beem,

thanks again
 
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