3/4 OSB flooring...

So are you saying this is a 16"by 16" run or is it maybe 10 foot span or more it would help to know the span lenght but if it is 16x16 inches it will hold about anything u can stack in that small spot.
My apologies, I was a bit hasty with my typing between errands. My joists have 16" centers, spanning 18'. Oak joists is my guess as I'm not sure exactly what wood went into barns in my area. I do know they measure exactly 2" x 6" & are very heavy @ 20' long. - Mike
the osb will hold nearly (within reason) anything you can stack on it... it's pretty ridgid... your joists, however, seem a bit undersized for the span. I think your joists will fail long before the osb does! jmho ...D
Ah, I see my typo. The joists are 2"x6". There is a 6"x8", in the middle, supporting the 2"x6"s.
I have 2 smaller machines, about 500 lbs per wheel x 4 wheels between the both of them, that I would like to park on the new plywood floor. Does this sound viable? - Mike
In commercial construction, OSB is only rated at 300 pounds per wheel. 500 pounds per wheel, especially with small diamter metal wheels, sounds like a lot for a wood floor.

See the link below
osb deck
I have never had any likeing for the use of "OSB" except for maybe as exterior wall sheathing only. it is a poor material to use for weight support such as you are considering. I would much rather see you use 3/4" Plyscore T&G underlayment and then lay on a 1/2" Plyboard subfloor which will support a lot of weight. This sounds almost residential and it is by definition. Most Barns have solid 1" x 8"-12" wide Lumber flooring and most where I come from were one of several different species of Pine. The mow floors of the barns at home were made of red pine which came from Canada and the north east USA .Most barn floor joists are on 12"CC and are at least 2"x8" or greator.
Take a good look at AdvanTech Flooring. Has been voted the #1 Quality Brand Leader by builders for eight years running now. I helped get AdvanTech on the production line. It's sanded both sides, tongue & grooved, branded and has a 50 year warranty. It's one tough product. I use 1 1/8th on my dump bed sides. It sits outside year round and haul gravel, feed and has a load of short logs on it right now. It sheds water very well. It's not intended to be used outside forever but I used it to see how long it'll last. It's been bolted on there for 6 years now.

We're in to our thrid year of ZIP board. Production is increasing each year for the ZIP too.
Your post needs to be re-done as the info is scattered around and very difficult to figure out what you are dealing with. For starters, you may want to be specific about joists as to size, dimensions, spans, etc. Also if you do a search on sturd-I-Floor, you will see much info. Tom
That's not enough joist for an 18' span. Even at full dimensions. Needs to be at least 2x12 for the 18' span. And the bending strength goes up as the cube of the height.

3/4 OSB floor deck is rated at 50 pounds per square foot (typical household load) with the joists on 24" centers, its better at 16" centers.

Gerald J.
The stamp on the sturdi floor should read APA which is the American plywood association. Try this and see if it helps.
www.gp.com/BUILD/DocumentViewer.aspx?repository=BP... -
I'm using it for exterior wall sheathing now on my siding project. Talked to a gal who works for a modular home builder. A tight wall builds up some moisture and the OSB then swells up. That affects how the siding looks. Because of those problems, they now drill a half inch hole in the OSB alternating between top and bottom every so often (I assume every stud cavity). Guess it helps it breathe. She mentioned some type of product data sheet or building standard that requires the holes.

They also use another type of sheet type barrier under the tyvek that is more waterproof. The use faceless fiberglass insulation and a spray on vapor barrier on top of the sheet rock. I removed some 22 year old tyvek on my house that was so brittle it was falling apart.
If you go to the APA website, you can register with your email and instantly download some of their publications such as their engineered lumber construction guide. Has all the specs for osb as well joists and span table information. Lots of other stuff such as nail schedules for wind loading and weight bearing of various thicknesses of osb.

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