non timberframe building question

[Brad_bb]

Sorry, I don't see any other more appropriate category...
The end of my pole barn was originally used for animals.  It hasn't been for a long time now and I'd like to enclose and insulate it and heat it for storage space. 
1. One of the corner posts is no longer attached to the ground as it has rotted at ground level (second pic).
The center post is also quite rotted but not completely yet (third pic).  Originally these posts were supported in the ground and the floor was pour separate.  So I'm not sure if I should change and have it supported by the floor?  How do I fix these posts (three 2X8's nailed together)?  Do I need to dig and pour a footing?  what should I do with the middle one since it is surrounded by concrete?  It would be awful difficult to get the old post section out of the ground through that hole.  What do you guys think?







I'm thinking that after I fix those, I need to remove all the sheet metal, add a sill plate with sil seal foam, then tyvec the outside, then reinstall new sheet metal, then have spray expanding foam shot in and trimmed, then sheet metal the inside.  I don't know how much that insulation would cost, if too much, then I need to figure an alternative.  I also want to insulate the ceiling well so I'll have to add purlins in which to screw sheet metal into.  What spacing?  2X6's?  Then blown insulation??  I might try to reuse some of the existing sheet metal to keep costs to a minimum and I'm going to install some used overhead doors to fill much of the currently open space. 





Thanks for any advice and suggestions,
Brad

[beenthere]

I'd cut the concrete with a saw a foot out from the post, and knock out the concrete around the post. Remove the old and put in a new treated post.

[geohayes7]

after you get it out it might be a good idea to pour the concrete back in first then buy a metal simpson beam holder for middle the beam to sit on this will keep the water away from it so it doesnt rot again

[Don P]

A true pole building uses that embedment in the ground for part of its lateral stability (rack resistance) putting the post on the slab defeats that purpose so an alternative means of accomplishing that goal would need to be found. We use the term pole building way too loosely to cover the ones I described and the ones that end up in the trees after a storm  .

[underdog]

Concrete and wood do not get along.
This building is how old? Anyway other than some rot it is not having structural problems so why re-invent it.
Jack the load off the offending post then and cut off the bad part also dig the stuff out of the hole .
figure out what you want to use to attach post to concrete.
I like stand off post to concrete anchor.  I would make my own (i think).
Here are some examples - http://www.shopwiki.com/search/USP%22%3B+POST+ANCHOR+4+x+4
Steel and concrete do not get along either, So figure on some tar paper gaskets.
Ok now attach your wood to concrete anchor to the post and form up a raised pier that will bring the concrete up to your new post length, it will have to be a little long on one side so you can pour in the concrete up to your anchor level.
i do not think it will matter that  little extra that ends up on top of the slab.
Take a day or two off then come back and pull your jack and form.
All done better than new.

Oh - do not forget to oil your form boards

[Brad_bb]

I am thinking I'll cut the concrete, dig out the old post segment, bore down with my post hole digger and dig out the loose material by hand, form a pier in the hole for concrete and rebar, with an anchor coming out the top and anchor the post to the pier with a post bracket.  I don't want to put the post on top of the existing slab as that was not how it was designed.  this barn was built in about 1986?  I've got to get another 2-3 years out of it to build my new workshop and move.  It could stretch out  longer than that but I hope not. 

[Zeke]

Dig out the old post and concrete. Then use one these protectors listed on this website. I've never used one. But, they do look interesting.

http://www.postprotector.com/