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troy_8 Member Posts: 109
1-1/2" Gypsum pour weighs approx. 14lbs/sq. ft. 3/4" plywood or osb is fine for a 16oc. subfloor.


  • Ray_13
    Ray_13 Member Posts: 15

    Does anyone know the load rate for a 1 1/2" gypcrete pour?

    Also, is there any problem pouring over 3/4" OSB as opposed to 3/4" CDX Plywood?

  • John Barba
    John Barba Member Posts: 166
    If my memory serves me well...

    1-1/2" of gyp weighs 14.5 pounds per square foot. Check with the gyp people about OSB. Try these guys -- my experience with them has been very good, and they know their stuff:


  • heatboy
    heatboy Member Posts: 1,468
    Just had one poured .....

    ....and it does weigh 14 to 15 lbs per square. They now pour in just one 1.5" lift instead of two .75".

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  • Rich L.
    Rich L. Member Posts: 414

    When I did my house Ray, my general bumped up my floor trusses to the next sixe. 14" instead of 11". Same standard 3/4" OSB sub floor he uses on all his jobs. Gybcrete guys were fine with that and everything worked perfect!
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