View Full Version : expansion joints
09-19-2008, 12:12 PM
I am Putting a sidewalk Around the deck and side of my house. I am doing it in small sections (8ft) at a time. I was wondering if I need to put expansion joints in between each pour since technically each pour will be between 2 structures.
P.S. Iknow it would be a lot easier to get concrete hauled in an do it all at once, but this is just something I want to do as I get spare time.
09-20-2008, 05:30 PM
Some 25 years ago, I had a concrete driveway poured. Of course this is much larger than a sidewalk, but the contractor separated the sections with outdoor treated 2x4s. They lasted pretty well until I replaced them this past summer. While it was a miserable job to chisel the old boards out, it's only a once in 25 years job. I used a sacrificial 1" wood chisel, crow bar, a couple of hammers, and several gallons of sweat.:D When I put the new boards in the slots, I first used my planer to shave 1/16" off of each side of the new boards. I think the well defined sections look very nice.
09-21-2008, 06:20 AM
I don't know how big this slab will be but if it's restrained from moving on opposite sides (you say it's between two structures) then you will need expansion joints.
And use expansion joint material made for the job. Pressure treated lumber won't compress enough to prevent damage from expanding concrete that is confined from expanding.