OK, this is probably a dumb question, but I'll ask it anyway... :)
I've got an 8x12 shed that I need to move that is currently bolted to a
concrete slab. My plan is to brace the shed inside, unbolt it from the
slab, jack it up, and bolt wood "runners" underneath. I'll be renting a
bobcat in the next couple of months for some excavation work, so I thought
I would try using that to drag the shed to it's new location.
Anyway, I'm curious about the slab. It's 8'x12' by about 6" thick (no
footings). It has no reinforcement of any kind. Is there any chance that
this could be pushed or pulled to the new location too without it cracking
into pieces? I know there is a full yard of concrete in the slab. Any idea
how much that weighs?
I've just assumed I would bust up the slab and bury it, but if I can
relocate that too, why not reuse it?
OK, if it is 8' x 12' and 6" thick it is closer to two cubic yards, one yard
would give you only 3" thick. Unless it is heavily re-inforced, I doubt you
could move it without breaking, providing you can get a grip on it to push
or pull it. Also the bottom would most likely be very rough and cause too
much drag to get it to slide.
For the next one make the bottom of very smoothly raked sand, form two
runners along each long side with the ends tapering up, like a sleigh. It
should be at least 6" thick with the runners about a foot deep. Cover in
sheet polyethylene to make it slick. Put in lots of steel rods and anchor a
couple of eye bolts on each end, tied into the steel rods. Then "possibly"
you could move it if you could get enough traction.
I didn't take the time to calculate what is there. I poured the slab about
15 years ago using 2x6's for forms. But, I know it took exactly one yard of
concrete. So, I must have dug down a bit deeper around the perimeter for
footings or something.
Yeah, that's kind of what I figured. It was just a wild idea anyway... :)
That actually might work to my advantage trying to break it up into pieces
I can move and bury in a hole I need fill. If it doesn't break just trying
to lift it up, maybe I can stick some rocks under it and drive the bobcat
over it to crack it up? Otherwise I'll have to rent a jackhammer.
If I'm able to move the shed, I'll probably just build a wood floor
underneath. It'll just be used to store firewood and stuff in. Nothing of
any real value.
Thanks for the feedback!
Concrete will break up fairly (hah!) easily using just a sledge hammer
if you can lift one edge so there is a bit of strain on the slab.
repeated blows with the hammer in a line across the slab is the trick.
I have taken out several sidewalks and a concrete foundation that way.
WEAR SAFETY GLASSES.
About 150# per cubic foot as I recall or about 2 tons per CUBIC yard. You
have about 2 cubic yards so the total weight will be about 4 tons. If not
reinforced, it will certainly break up with any reasonable attempt to move
Actually, you have nearly two yards of concrete there: 8' x 12' x 1/2' = 48 cu
ft = 1.77 cu yd. Figure around 150 lb/cu ft, so you're getting close to four
tons. Dunno what you're planning on using to drag it... but I don't think a
4WD pickup truck is gonna do the trick.
I doubt it, I tried something similar at work a few years ago, I attempted
to move a slab like that with a forklift, I did get it lifted in one piece
( working very gently) but when I was traveling with it I hit a small bump
and the slab broke into a bunch of little pieces. Since pushing or pulling
would undoubtedly be rougher treatment than carefully lifting and carrying
it, I doubt you will have any luck.
Of course..if your going bust it anyway..why not try to move it first?
For what it's worth, I did something similar on a smaller scale and wasn't really
pleased with the results. I needed to take out a
sidewalk with pieces about 2.5' by 5'. I cut them with a saw and moved them with a
small tractor. ...wanted to simply piece them
back together to put some implements on at the rear of my property. ...never gave
much thought to what the concrete pieces looked
like on the underside. ...extremely rough to the point that the pieces wouldn't
really sit very flat at the new location. They are
somewhat adequate for the purpose I am using them for, but for the amount of work
that this was, if I had to do things again I would
have simply threw the pieces away and poured a small slab instead. Concrete is only
about $50 to $100 / yard so putting in a new pad
won't be that expensive. By the way, I was able to pick up my small pieces with the
tractor's loader, if I would have drug them, the
rough underside would have caught on the ground, made a major mess, and caused a huge
amount of drag. By contrast, however, I am
currently pouring small sections of a driveway a bit at a time - I have a 4' x 5' x
3.5"deep rectangle form with a plywood bottom
that I have ready for left-over concrete. Because the bottom is very smooth, I'm able
to drag the thing after the concrete cures
fairly easy with my small tractor. The smaller sidewalk sections that were poured on
the ground as is typical are too rought on the
bottom for the same tractor to pull.
If you think that the bottom is much flatter than mine and you still want to try, you
might think about first drilling some holes in
the slab at an angle and using concrete epoxy to embed some rebar bent into a loop
into two holes. This can be used to pull the
slab. After it sets up, you could lift one part of the slab and place a long section
of pipe under it perpendicular to the direction
you intend to go. Then lift the other end and again put a pipe under it and under the
middle. Place a few more pipes in front of the
slab. As you pull the slab, it will roll off of the rearmost pipe and onto the pipe
in front of the slab. Take the pipes that were
uncovered at the rear, and reposition them to the front and repeat as necessary until
you roll the slab to its new location.
you could possibly raise and move the entire structure, shed and slab, if
they're attached to each other, or move just the slab:
(look at "Raising and Moving the Structure" on the left, under the category
"Methods and Techniques")
given the size, though, it woudn't be economically feasible (concrete is
if you don't pour a new slab to put the relocated shed on, consider a gravel
base to put the new floor on if it is on grade, the gravel will help
also might want to disassemble the shed partially (down to separate walls,
etc.) if moving it with the bobcat is too shaky
other good advise in this thread about partially raising an area of the slab
to put strain on it then busting it up with a sledge hammer (or maybe then
driving the bobcat over it)
if you had a concrete saw available at little or no expense you coudl also
cut it up into smaller pieces and use it as stepping stones or some other
landscaping or building material
on a previous topic, am still working on engineering the cathedral ceiling,
used your suggestion for adding plywood gussets, went ahead and nailed some
on both sides of the old rafter/new rafters for structural integrity, am now
working on getting the insulation and ceiling in, as time allows
have 11" of airspace now (was 4") between underside of roof decking and what
will be new ceiling, to add insulation and a radiant barrier in, looking at
wool insulation, or possibly cellulose or sprayed in soybean foam (either
which would require their own contained cavity for the radiant barrier to
work, so will probably go with wool, it has fire retardant added and is also
environmentally friendly like the cellulose or soybean foam)
Us old farmers never waste old concrete. You might be able to saw it
6 pieces (4x4 ft each) then get some nice round fenceposts and roll it
on them (keep adding a post ahead of it. However, that is a lot of
work and screwing around. However, if you break it up, use the pieces
for your new slab. Put down some gravel. Put up your forms, and put
the pieces of old concrete in the forms about one and a half inches
below the surface. Always leave spaces between the pieces. Wet it
down real well with the hose and jump around an all the pieces to push
them tightly into the gravel. Now rent or borrow yourself a drum
mixer and mix some concrete using portland cement, sand and a FINE
stone (3/4" and less). Mix the stuff and pour it over the chunks of
old concrete, and work it into the spaces between the chunks of old
concrete. (Be sure the old stuff is a little wet, and clean, so hose
it again, right before pouring the new cement over it). Trowel it out
as usual. You'll make an extremely strong slab this way, and it will
be much thicker than usual. I have done this for years, and besides
busted concrete, I put rocks on the bottom, busted up concrete blocks
and bricks, etc. Be sure to make your new cement a little stronger
(more portland) that usual, because you are also "gluing" those pieces
I had an old garage that I rebuilt the walls and roof. When I was
done I had a nice garage on top of a crappy floor. The rear part of
the floor was ok, but the front was all cracked and rough, and a
section had settled. One day I started busting up the bad part of it,
where it had settled. I just tore out a 6 ft. area, stacked all the
old cement, dug out some of the dirt underneath, and put the pieces
back. I put some forms on the sides where I planned to bust out more,
and poured the new cement over the top. When that was hard, I busted
out another section and did that one, etc.
Eventually I replaced the whole front section, and left the rear. Its
held up just fine.
More than likely I'll just bust up the old slab into pieces that I can move
easily. I have a large hole on one end of our property that I need to fill
and level the area for a future small barn. I've got lots of bolders,
broken concrete pieces, etc. that are littering up the place and would make
good fill. So, I'm essentially accomplishing two things at once (cleaning
and filling). Any stones or concrete I can put in that hole will reduce the
amount of fill I need to bring it up to grade.
So, it's not exactly going to waste... :)
If it's 8x12x.5' then that's 48 cuft, or around 7200 pounds.
If it's really a cubic yard, then that's 27cuft, or about 4000 pounds.
You could TRY moving it, but I'm a bit skeptical of your chances
of success. Get four 2-ton bottle jacks, and dig them in under
one edge. slowly crank them up all together, until either the edge
has lifted enough to shove a rail under, or the slab breaks up.
If the former, repeat on the other side. If the latter, it was
too brittle, anyway.
HomeOwnersHub.com is a website for homeowners and building and maintenance pros. It is not affiliated with any of the manufacturers or service providers discussed here.
All logos and trade names are the property of their respective owners.