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JeffPritchard

03:17PM | 01/18/04
Member Since: 01/12/04
2 lifetime posts
Bvbasement
I have heard that it is common when building a barn or garrage to pour the foundation, sometimes build the barn, and then come along later and pour a slab floor in the barn.

If you do this, how do you screed the floor? Seems like the foundation and/or barn would get in the way and you wouldn't have anything to lay your screeding 2X4 on. Is there some other technique used for screeding it, or do you just have to make do with floating and skip the screeding?

Also, are you supposed to put something in between the floor and the foundation to allow the floor to move independently and allow for expansion?

thanks,
jp

Glenn Good

12:29PM | 01/31/04
Member Since: 09/10/03
314 lifetime posts
You use a ½” x 4” expansion joint installed around the perimeter walls. Grade stakes can also be used in the slab at 12’ – 14’ centers. These stakes are set so the top is flush with the surface of the slab to be poured. Grade stakes are removed or pounded down as the concrete is screeded.

Another method is to install the grade stakes low enough to allow a pipe to rest on top of them (1 ½” – 2” diameter pipe works best). The stakes are cut in a “V” on top or nails can be used to keep the pipe from rolling off the top of the stakes. Then a screed can be used along the top of the pipes and the pipes are moved as the pour progresses.

When pouring the slab a hand float is used to level the concrete flush with the top of the expansion joints around the perimeter. The screed is then used in between the expansion joints and the grade stakes to get the concrete on grade. After you screed the concrete a bull float is used to smooth the surface and bring the cement to the surface.

Glenn Good www.consultationdirect.com

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