I am a brother on Bear's Patreon channel. My handle there is KansasScout. My trouble is I have a 10x12 ft. shed that needs a new floor and to be raised so the current 4x8x16 concrete blocks can be replaced by 8x8x16 ones. The interior has been ruined by an animal that tore through the OSB flooring and made the place into a nest and bathroom. I am thinking of replacing the OSB with AC2 plywood. My contact information is available by emailing me at kansasscout0002@gmail.com.
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I am going to assume this is a stick construction. I agree with the hydraulic jacks and some 4x4s for beams to get it up in the air. We lifted a building, 16 x 30' all around this way. Cribbing was stacked under each corner, like you would lay logs for a log cabin, 4 pieces of 4x4 each layer. Jack one side, using two bottle jacks, enough to get the sill up high enough to lay in another layer and then move to the next side and continue. It's slow and a pain, but gets the job done. Another thing I have done is use a Kubota to lift the sides to get a building up high enough to lay in a beam and some 6x6 blocks. Scary and you don't want to do this alone like I did. I can't 'see' what you have to work with so can only offer my experiences. Question, is this something you could dismantle and then put back together? I hate to say this, but sometimes it's a lot easier than trying to work with something hanging over your head. This would give you a chance to get to the ground underneath and do anything needed before you lay in new foundation. Pics would help if you're able. One last thing, if by some odd chance this is a metal shed, I would find the attaching bolts get them out and then use a truck or tractor and just pull it off of the foundation. Strap it completely around and just hook up and slowly and gently pull it off onto some skids or jack it and put a couple of 4x4 skids under it, attach to the side through the bolt holes and then ease it off and out of the way. If you're thinking of doing this, you must have some building experience.
It's stick built and the OSB is rotted out due to water getting in through the main door because of erosion from the uphill slope above the shed. That's why I need to raise the shed to replace the 4x8x16 blocks it's resting on. I will look at getting or renting a jack like was suggested in some of the other responses. As to dismantling the shed is built like a small one room cabin.
Not sure if anyone has responded to this or not. Not sure exactly what you are looking for. How-to? Help?
How to and if possible help, but this could wait for when the stay at home orders are lifted. I have thought of replacing the OSB with AC2 plywood. It is the jacking up of the shed to replace the blocks that seems hard to me.
I used a single piston hydrolic truck Jack and various size boards to lift and shim my barn and replace the supports. It takes a while, but is generally safer than trying to lift the whole thing.
Do you own or have access to a hi-lift type farm jack? That will lift the shed. Just be careful not to let the handle smack you. They can be tricky but they can start low and raise high. Plywood or OSB are fine for shed flooring. What really needs to be done is to put up some sort of wire barrier, such as hardware fabric, around the bottom of the shed to keep critters out from under the shed. For aesthetics, the wire can be covered over with lattice, if necessary.
1 1/8 T/G plywood subfloor will do much better than OSB over time. How tall are the joists? Do you intend on storing heavy equipment there or siting anything heavy? Agree hardware cloth will keep the critters frustrated!
I think the joists are 2x8s or 2x10s. I will take a picture and upload it later.
@Douglas Hemmingway over what span?