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vanduynhouse

Concrete over a plywood subfloor with 16" on center floor joists

Luke VanDuyn
hace 9 años
The original plan was to do a 2" concrete pour over our radiant heat system as recommended by our builder. We are hearing a lot of concerns from concrete contractors about pouring that thin. Does anyone out there have any information about how we can do a finished concrete floor on a plywood subfloor with 16" on center joists? Or do we have to go a different route? What would that route be? We are going for a very modern look. Thanks for any information you can provide we are at a loss for what to do at this point.
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  • PRO
    Kevin Moore Architect
    hace 9 años
    More than likely you will get cracks in a slab that thin but there are some things you can do to try and reduce the occurrence. Is the current concrete design specified as lightweight or high strength concrete? if not you might be able to get a bit thicker slab (2 1/2" or 3") at the same weight. You will need to run that by your structural engineer of course.
    Secondly; as the concrete cures it shrinks, this causes most cracking. Work with the builder to get a low water ratio in the concrete mix, it's a little harder to work with but will result in less shrinkage. Slow the curing process as much as possible.
    Third; if not already specified, you can use a dense welded wire mesh (like 4x4) to try and prevent cracking.
    Fourth; layout control joints at all inside corners in the slab, they should relate to the architecture but try to get as many as you can, see this diagram http://www.concretenetwork.com/concrete/slabs/controljoints.htm
    Fifth; if all else fails and cracks appear that you cannot live with, you can pour a micro topping to even everything out. They can be colored or natural.

    It looks like a great project, hopefully these tips help. Concrete work is a bit of an art form, what works in one pour may not work in another but that "personality" is what make concrete such an interesting finish material.

    Comentarios (6)

    • Luke VanDuyn
      Autor original
      hace 9 años
      Kevin, thank you for taking the time to comment, we really appreciate the information! The original specification was for I think 3,000 lb concrete, but I will have to double check. Would you have any concern putting the 4x4 wire mesh over the top of the radiant tubing (Already stapled to the floor, as shown in the picture) or would you recommend pulling that up and placing the wire mesh below it? Attached is a picture of the house if you are interested, I would also love to hear your feedback on the design. thanks!!
    • PRO
      Kevin Moore Architect
      hace 9 años
      We had a similar concrete floor with radiant tubing and the wire mesh (attached to spacers) just floated over the top of the tubing. The concrete was specified to reach 3,500 psi at 28 days with a water-cementitious ratio of 0.45 and a max. slump of 4" with shrinking reducing ad-mix. With some judicious control joints we only had a few cracks.
      The design looks great I like the materials.
      Luke VanDuyn agradeció a Kevin Moore Architect
    • tim grubbs
      hace 6 años
      Última modificación: hace 6 años

      Good morning! I know this sounds crazy but I want to do a concrete floor over plywood in a mobile home bathroom. We did a concrete overlay on kitchen counters and they turned out beautiful, Any information would be great! Thanks

    • Tanner Blower
      hace 4 años

      Very Nice home!
      What did you end up doing? I am wanting the same modern concrete look with radiant floor heat.

    • AZ Irish
      hace 2 años

      Luke, that looks like a great design. I hope it turned out as you hoped. I am just now in the planning stages of designing and building my own new home. I'm looking to do a similar design so I'm very curious to hear what you ended up doing and how it turned out. I am also curious to know what material you used for the "wood" siding. Is it actual wood plank or a composite material of some sort? It looks amazing so any info on the product would be appricated.

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