Garage Storage loft

[kofi]

Hey all, trying to figure out how to build a loft in our garage for storage mainly.
It needs to be fairly strong so that I wont have to worry whatsoever about anything I put up there (engine block, spare body parts, folding engine crane, parts boxes, compressor, water tank etc)
I want to have it span across the back wall and come out about 5-6 feet.

I was thinking 6 4x4 post with a 2x8 ledger board attached to the studs, 2x6 joists 16 oc with osb on top and then for front another 2x8 board with the 4x4s notched and lag bolted. What do you guys think of this? And tips or advice welcomed thanks!

Garage Specs
20x30x12
I would like the loft around 20x6

 

[matt_i]

I did some rough calculations. I think you want to go with 100psf if engine blocks are to be stored.

That's 20 * 6 * 100 = 12,000 lbs of load not including the structure itself above your head....so design carefully!

Some general notes from one snap calculation I did on deflection under distributed load above. (obviously would need a more formal analysis)

- I would use 2x8 joists with hangers.
- I would use either a doubled 11-7/8" LVL or possibly a single LVL of greater depth to be your ends.
- I would use 6x6 posts, appropriate triangular bracing to make sure they don't slide, can capture inside the building to avoid sway issues.

 

[GMCGarage]

make sure you check the bearing on your slab too.

 

[kofi]

I did some rough calculations. I think you want to go with 100psf if engine blocks are to be stored.

That's 20 * 6 * 100 = 12,000 lbs of load not including the structure itself above your head....so design carefully!

Some general notes from one snap calculation I did on deflection under distributed load above. (obviously would need a more formal analysis)

- I would use 2x8 joists with hangers.
- I would use either a doubled 11-7/8" LVL or possibly a single LVL of greater depth to be your ends.
- I would use 6x6 posts, appropriate triangular bracing to make sure they don't slide, can capture inside the building to avoid sway issues.

So I've re thought this and the possibility of getting a block up there is slim, so with that in mind do you still think I should go with your advice still?
Sorry if I sound noobish, I mainly work on cars not houses