Shed build advice *please*

[benjie808]

Hi everyone

I already accepted the job of turning an old, pan-tiled shed (which, I think, was converted once already into a shed from a pergola) into a massage therapy space. I have removed the bottom couple of cladding boards to expose the main upright posts (6 of them with corner braces) some of which need replacing. The posts are fixed with post anchors which are welded to metal plates that extend outside the building and are quite corroded.
The concrete slab is flush with the framing on two sides and extends way out past the building on the other two (with a fall towards the building).
What are my options?
Could I build a single concrete block wall under the perimeter (with rebar anchors drilled into the slab) and then fix a wall plate to that wall to fix the shortened uprights to? I would have to do this in stages I guess, whilst supporting the building with props somehow.

Maybe I could just repair the uprights with half lap joints (or replace full lengths which will be a big mission!) and deal with water ingress another way...

Any advice very gratefully received. Thanks.

 

[benjie808]

The job is in Greece (earthquake country)

 

[DGersic]

Is demolish and build new an option? I don’t see much there that I’d want to save.

 

[LopezBart]

Obviously, the roof tiles are fine. If there are reasons to preserve as much as possible other than simple economics, consider disassembly & rebuilding. The bottom posts appear riddled w/ either insect or dry rot damage. Replacements should be resistant to such attack. Is there let-in bracing in the walls? The siding has little shear strength.

 

[karoc]

Maybe rain water splashing on bottom roll is what took it out. Guessing this is labor of love project, going for that antique weathered look. I know I have taken on projects that should have started for scratch. Labor of love, go for it.

 

[Wolley]

A row of block would be good around the bottom. You need to be able to jack it up first. Brace the building well before get too far. I'd prob go with a new 4x4 sill anchored down then sister new studs to the old ones. Then you could cut off the rotten parts of old ones and put new pieces in.

 

[Fav Onefour]

Tough project. Hope the gig is labor and materials.

You mention that the extended slab is sloped toward the building. The pictures show rot on sides without the extended slab. Is it the same rotting on all sides?
I get the idea of trying to repair without going nuts. Doing a row of block or even a pour wall would be doable. It would be a lot of work for the end result. "I'm guessing the original cladding boards will remain."
On the other hand, if you are reskinning the building, I'd just start over. I see plenty of those pan tile roofs get disassembled and sitting on pallets while they rebuild structures. I'm sure you could also salvage the soffit trim and roof structure material.
Redoing all the wall base and building up a so called footing will take quite a bit of time and a fair amount of material. You are getting close to the whole building costs if the roofing and related structure is taken out of the equation.