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Started By
Message
removing 4x4 post from concrete slab
Posted on 2/18/20 at 8:33 pm
Posted on 2/18/20 at 8:33 pm
The previous owner of my house installed a small concrete patio on the side of the house. They sunk 3 4x4 posts into the ground at the corners of the concrete. To be clear, the posts are within the perimeter of the slab - not on the outside of the perimeter. One of the posts is warped and I'd like to figure out a way to get it out of there without completely messing up the slab.
The only thing I've really come up with is to saw all the posts off at the base, try to saw them a bit deeper, then put a small fill of concrete on top. I'd then replace all three posts on the outside of the slab.
Any ideas? TIA.
The only thing I've really come up with is to saw all the posts off at the base, try to saw them a bit deeper, then put a small fill of concrete on top. I'd then replace all three posts on the outside of the slab.
Any ideas? TIA.
6
Posted on 2/18/20 at 8:43 pm to atom1505
Cut it off and drill/chisel the post out
Posted on 2/18/20 at 9:34 pm to atom1505
Cut posts level with slab....or as close as you can get. Drill hole wide enough for a sawzall blade. Put long sawzall blade into hole and cut towards edge of post. Repeat in different directions. Question is how deep is post? Probably 12 to 15" so you need a drill bit that long and a sawzall blade that long.
Posted on 2/18/20 at 9:43 pm to atom1505
Id probably just cut it off at the slab and put a steel pole bolted to the concrete in its place. Pictures of the existing condition are invaluable when these questions come up.
For future posters, put pictures in your posts if you want an accurate guestimation otherwise just pay a contractor to do the work.
For future posters, put pictures in your posts if you want an accurate guestimation otherwise just pay a contractor to do the work.
This post was edited on 2/18/20 at 9:45 pm
Posted on 2/18/20 at 10:20 pm to Zappas Stache
quote:
Drill hole wide enough for a sawzall blade. Put long sawzall blade into hole and cut towards edge of post.
This is what I was gonna post. I bet you could also find a pretty big hole saw blade for cheap or get an extension to where you could cut a 3-4 inch hole pretty dang deep through the wood.
Posted on 2/18/20 at 11:14 pm to atom1505
I would cut them flush and use a 4"x4" post base or pedestal for the new posts
Posted on 2/18/20 at 11:26 pm to weadjust
That looks like the way to go, because then I could upgrade to 6x6”s. Do you think those post bases would be strong enough to sustain a small load like string lights or a shade sail?
Posted on 2/19/20 at 8:37 am to atom1505
If you have what is called a farm jack (see below) or have a friend who drives a lifted jeep, you can likely pull it out. I've done it with wooden fence posts in concrete.
Posted on 2/19/20 at 8:55 am to weadjust
quote:
I would cut them flush and use a 4"x4" post base or pedestal for the new posts
My concern with that is that remaining post wood in the concrete will rot due to it being exposed to water at every rain and no place to drain. That anchor bolt will have nothing to hold onto. If you can relocate the post slightly and use a concrete anchor, you will have a better product.
Posted on 2/19/20 at 9:27 am to atom1505
quote:
Do you think those post bases would be strong enough to sustain a small load like string lights or a shade sail?
Yes - Post bases are used all the time to support roof loads on porch roofs and carports. I wouldn't worry about the post that's left in the concrete rotting. If you are you could put down a bead of silicon around the post before install the base to keep out water.
Posted on 2/20/20 at 4:41 pm to atom1505
I got one out one time with a sledge hammer (to hit wooden post to break seal where concrete was attached to wood) and a farm jack like this from tractor supply.
https://www.tractorsupply.com/tsc/product/bulldog-farm-jack-48-in?cm_vc=-10005
I drilled a hole in the post and attached a block of wood to it with a 1/2" bolt and jacked it right up out of the slab.
Was not difficult.
(eta:Sorry had not seen this was already mentioned.)
https://www.tractorsupply.com/tsc/product/bulldog-farm-jack-48-in?cm_vc=-10005
I drilled a hole in the post and attached a block of wood to it with a 1/2" bolt and jacked it right up out of the slab.
Was not difficult.
(eta:Sorry had not seen this was already mentioned.)
This post was edited on 2/20/20 at 4:44 pm
Posted on 2/20/20 at 6:14 pm to alphaandomega
How long has the post been like that in the ground? Treated post last a max of 25 years under ground. If it's been down 12+ years as the wood has aleady started to break down, I would use a farm jack to lift it out. 
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