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I learned something new today...
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11-02-2011, 09:09 PM #1
eaadams Concrete Moisture Expert *****
Status: Offline Posts:600 Threads:88 Joined:Jul 2010
... today I learned to look at other parts of the concrete design. The slab design said 5". But, one side of the gym came in at 99%.

I freaked out and said oh no oh no henny penny the sky is falling. I now feel pretty dumb.

After some research the GC pointed out that the side of the gym that is reading high has a masonry wall. On that side of the room, the concrete is 14" thick to support the masonry wall. So duh it isn't dry.

Anyway, I have to figure out how to read walls now before bid. Not sure how but I will have to pull out this projects plans and teach myself a new skill.

Learn something new every day. Shows why we have GC's. They do have the whole building in mind. Smile

Now I have to find out if the sealing company can do the whole bead blast and seal and top coat 12' of concrete without having to level the whole floor.

11-03-2011, 06:50 AM #2
CC Solutions Concrete Moisture Evangelist *******
Status: Offline Posts:1,067 Threads:69 Joined:Dec 2009
Good information Evan!

I come from the GC background so that part is natural for me. You can easily seal just a strip where a trench footing is, or even squares where column pads are. I like to extend the seal an extra 6-12" beyond the deep pour. If you need an absorptive substrate for your adhesive you can put down 1/8" of cementitious underlayment and feather that out at the edges. When you glue your flooring down you will have to pay special attention to these areas because the glue will not dry as fast as the rest of the field.

Any thickened slabs should be shown on the foundation plan.

Now tell us... Did you put a probe in 5.6" deep in the thick slab? Wink

JD Grafton
Concrete Answers for Flooring Problems

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