Concrete specs for basketball court
Hi all,
I’m planning a small (450 sq. ft.) backyard basketball surface, and would appreciate some pointers on a few specifications for the concrete.
Specifically, what psi, air-entrainment, depth, re-bar/WWM, gravel bed, and slope should I spec? This will be in the Kansas City area.
thanks!
Replies
I'll probably catch grief from my posting from others, but I'd go with minimum 4" thick, with a crusher run sub base compacted to 95% density, a 4 bar mat tied at 12" centers and 2 inches above the subbase...slope is generally 1/4 inch per foot from my experience, and thats quoting a NYS Department of Transportation spec for flat surface runoff.
Pour no greater than a 4 slump..make sure you've got all the bodies in place for this pour to finish correctly, after the pour and screeding and finishing, cover with plastic sheeting(we don't call it visqueen in NY) and keep the surface of the crete damp to allow proper curing. It may be overkill for a basketball court, but I'm assuming you don't want it cracking in a couple years either......most of the work I did in upstate NY required us to keep it covered/damp for at least 7 days, the longer the better for true compressive strength....
If you aren't one of the one's I'm talking about,you shouldn't have any complaints....
That sounds good to me. Except I would shoot for a .25% slope on a game court. (.25% = 3"/100')
I would research and spec FF/FL for the pour.
Ff/Fl Numbers and Concrete Slab Flatness"For reference, the Maple Flooring Manufacturers Association (MFMA) requires that the general contractor provide a concrete slab, troweled smooth and flat to a tolerance of 1/8" in a 10' radius for all gymnasium floors. (FF of 1/8")"
See also: Features Item : What 'Ff & F1' Mean to the Floorcovering Contractor "Ff & Fl tests are done usually within 72 hours of the placement of the concrete, and usually are not taken within two feet of the edge of the concrete pour. Why not? Concrete experts told me that they didn’t test near the edge because “Concrete usually curls.” "
SamT