I’m going to be removing an old barn 16′ x 22′ that is sitting on a rough looking concrete pad and replacing it with a 24′ x 30′ shop. The shop will sit be located on one original corner and so project an additional 8′ in two directions. (that was the only way to get the permit). The shop is to be standard 2×6 construction 10′ walls, 12/12 attic trusses.
The shop will initially house a 4000 twin axle ’61 Airstream and some industrial tools each weighing in at less than 1500 lbs, I guess I would like to park a truck in there sometimes so that 6000 lbs. Not too heavy.
I’m going to need more than a std pad as it’s over the 600 sq ft threshold the county allows. Before I call to see what the inspectors want, I wanted to ask for any suggestions regarding using piles (say 8′ deep) and a grade beam or maybe a 4′ frost wall. I “thought” it would work to essentially get the perimeter poured up then fill will sand or road crush over and around the old pad then before the new slab. Is this asking for trouble given that I live in Alberta which has reasonably extreme weather/ frost heave? Or should I remove the old pad and start afresh? A neighbour suggested getting a track hoe to move the pad out of the way but I’m a little skeptical about that working out. Any tips about cost effectiveness would be great. I have little concrete experience (one ICF basement, just the walls) so I’m not sure how much I’d work on myself.
Pic attached in case it helps.
Replies
I sthe barn to be removed the gambrel one in the first picture? I only downloaded one, because those are fairly large files.
I ask because if the shed on the right is the one, the low spot with water collecting could be an issue. The barn seems to have drainage away from it though.
If the old were in the center, you could easily leave it right there.
But since it is same corner location, you need to do something with it. You want the perimeter of this to be continuous with same footing/load bearing method.
were it me, I would break up the old slab and use if for fill someplace.
As far as loads and thicknesses of crete, lots depends on the spoils and their load bearing capacity there. We have clay so we excavate humus on top and compact in 18" mineral soil ( sand/gravel mix) That handles anything we do with a 8-10" thickened edge slab and rebar tied 24" OC
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Yup, that's the one (Gambrel Barn),(the smaller shed will be removed too, but has no pad) I think breaking up the old pad and using for fill would be pretty quick and cheap. Thanks for your reply.