Mezzanine capacity?

[Daubs]

Modeled my mezzanine off a friend's, wondering how much it can hold weight wise? My retired carpenter Dad thinks it's overkill for what I will be storing up there (miscellaneous decoys / hunting and fishing stuff, general garage stuff. Nothing super heavy -- no engine blocks, heads, etc.).

Mezzanine is 2/3rds finished...last section will have stairs against the wall. 10' deep, little less than 10' between walls and support posts.

Walls are 2x4's with 7/16th OSB sheathing. No nails, everything is screwed together.

Loft is tied to walls with 2x6 screwed to the walls at studs. 2x6 joists @ 16" centered, joist hangers (again, screwed, not nailed).

Main beams are three 2x8's screwed together. Main posts are three 2x6's screwed together. Floor is 3/4" tongue-and-groove OSB.

 

[MFolks]

Got any Engineer friends? Is a University close by? Shoot some pictures and write down the particulars, maybe as a problem solving exercise they may help?

 

[MFolks]

Just looked at the picture,it seems good to me,as long as the loads are not in one spot to even out the stresses.

 

[GMCGarage]

Modeled my mezzanine off a friend's, wondering how much it can hold weight wise? My retired carpenter Dad thinks it's overkill for what I will be storing up there (miscellaneous decoys / hunting and fishing stuff, general garage stuff. Nothing super heavy -- no engine blocks, heads, etc.).

Mezzanine is 2/3rds finished...last section will have stairs against the wall. 10' deep, little less than 10' between walls and support posts.

Walls are 2x4's with 7/16th OSB sheathing. No nails, everything is screwed together.

Loft is tied to walls with 2x6 screwed to the walls at studs. 2x6 joists @ 16" centered, joist hangers (again, screwed, not nailed).

Main beams are three 2x8's screwed together. Main posts are three 2x6's screwed together. Floor is 3/4" tongue-and-groove OSB.

Quick calc has the joists at 40psf. So normal stuff. Dont start putting up engine blocks! The connections should be good for that too, as long as you have at least 4 screws per hanger. Not sure about the beam down the middle, whats that made up of?

 

[Daubs]

Quick calc has the joists at 40psf. So normal stuff. Dont start putting up engine blocks! The connections should be good for that too, as long as you have at least 4 screws per hanger. Not sure about the beam down the middle, whats that made up of?

Hangers have lots of screws in them, I think 8 each.

Beam down middle is three 2x8's screwed together. They are 10' long.

 

[MFolks]

Keep your loads spread out,watch for sags,and you should be OK.

 

[jdewitt]

If I had to guess where it would fail first if you just kept adding weight until failure, I'd guess it would fail at the screws holding the 2x6s to the walls. To be on the safe side, you could add a some large nails there (better under shear load than screws). If you wanted to be extra paranoid, you could run a couple of 2x4s down from the 2x6 to the floor to help transfer the load to the slab. If you do that as a retrofit, make sure they are in there really tight and attached firmly to the wall so they can't buckle.

 

[jdewitt]

For the last section that you have to build, you might try cutting away a strip of OSB, cut the studs down by the height of your joists, and set the joists on top of the studs and connect with a tie plate.

 

[killer cougar]

Should be good! Didn't go into detail but all the minimums have been met structurally.

 

[GMCGarage]

Hangers have lots of screws in them, I think 8 each.

Beam down middle is three 2x8's screwed together. They are 10' long.

I would safely say then that 40psf is your load then.