Gold Lifetime Member
Join Date: Jul 2009
Location: Lauderhill, Florida
Re: Pour concrete into existing pole barn
Make sure you put expansion material around any supports that will be protruding from your newly poured concrete ,it will limit cracking after you pour.Make sure you cut control joints in the slab after you pour it.They only need to be about a 1/4'' deep.If your slab is 24'x24',you should be fine with two cuts;one from east to west,and one from north to south effectively giving you four 12'x12' squares on the slab.When the concrete cures this will give it a controlled location to crack.If the ground under your pole barn has never been disturbed and is reasonably sound you should be O.K.If not, it wouldn't be a bad idea to run a compactor over the sub grade before you pour.Make sure you don't bury any organic matter under the slab area(sticks,logs,grass,leaves,etc.)because it will decompose over time and give you settlement issue's.As far as screeding,form the slab into more managable sections.After you have your 24'x24' box,sub-divide it into smaller sections such as 4 12'x12' boxes within the main form layout.After you are all formed up,run stringlines from form to form and give your self some grade stakes throughout the slab.Simply put a nail in the side of the stake where the stringline contacts it and that is where your top of slab will be.As you work the concrete through the area's and you are satisfied with the level,simply pull out the grade stakes.Make sure you put some sort of reinforcing in the slab before you pour.6''x6'' welded wire mesh is ideal and can be purchased at Home Depot.IF not check with your concrete supplier of choice and see if they offer fibermesh.This is simply concrete with fiberglass strands mixed into the mix that acts as the reinforcing.After you pour the concrete and it starts to cure(harden),set up a garden sprinkler on it and wet it down over night.This will help it cure and lessen the chances of cracking.Give the concrete about 2-3 days before you put anything heavy on it.You should be able to walk on it in a few hours after you pour.If this all sounds like alot of work,it is.It might not be a bad idea to get some quotes from a finishing company to place and finish the concrete for you.Remember,once it's dry,it's yours.I would recommend a mix design of at least 2500psi or greater.A broom finish would be the best finish for a high traffic area,and it will not be slippery when wet.Good luck and have fun.
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