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.
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.
