Please be gentle, I am new around here.
I am building a structure that is 22'X24', 12' ft high with a 20'w by 11'h opening (on the 22' side) that will have a curtain. Flat roofed. 2 egress doorways at the back
The structure is to be used as a spray booth. As such the majority of the space will only support some fluorescent light fixtures (6 to 8 in roof and 3 to 4 on each side) and it is in another building to which I can guy the roof off of overhead beams, that part I have no problem with. The interior and roof will be lined with thin plywood.
I have two issues. The first is that I have to support a approx 300lb fan unit in the front 3ft over the doorway, centered in the 20 foot opening. Do I need to purchase manufactured beams (2 I would presume) to support this or would the be another way?
The next is I was thinking I could use 2x6 for the walls as 2x4 I would think to be too light weight over the entire building and 2x8 and 2x12 would take up too much room. Am I on the right track? Do I need to reconsider what I use where the fan is?
Glad I found this site before starting.
Welcome to the forums! In what position will that fan be .....down or out? The total unsupported opening will need help, not only for the fan, but for it's own ability to stand alone. The opening will probably need triple LVL beams, bolted to each other across and supported sufficiently at each end in order to keep from sagging or collapsing. 2x6 walls would be sufficient as you will need to accommodate some form of insulation with paint resistive shell or finished interior walls, since I am sure you get cold up there.
Just want to add, I have had one experience building a commercial building for an auto repair shop and the town would not issue a permit if it included any painting. Plus my insurance company, as I was renting to the shop, specifically excluded coverage if painting was to be part of the operation. Not sure what is required in your area but check if you need.
Bud
Why not support that big fan from the building's overhead beams? Just make sure they are capable of carrying the extra concentrated load.
If you tell us what the beams are made of, their size, length and spacing and how far away from where you want the fan to be, maybe we can help in that area.
My workshop was built with 2x12s on 16 centers for the ceiling joists. 28 feet long, 24 of which spans the inside of the workshop unsupported and holds the lighting, air conditioning ducting, electrical service, air lines, and the foamed roof over plywood.
My guess is that if you went with a Gambrel roof that you could do it with less material weight, though obviously with more cutting and joints.
-- Please be gentle, I am new around here. --
can you post a pic where you want you fan to be installed?
I'm just assuming that if it's pure steel then a 300lbs fan is still light..
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