• Class-B Aggregate Exposure: 85% Fine Aggregate, 5-15% cement fines and coarse aggregate.

  • Class-C Aggregate Exposure: 80-90% coarse aggregate, 10-20% blend of cement fines and fine aggregate.

Part I: Before Framing

Grinding on an Open Slab

If you want your polished concrete floor to have aggregate exposure showing the small to medium rocks, what is known as Class B or Class C, it is best done done on an open slab before framing.

See the accompanying chart, at right, for details.

Grinding on an open slab.  We hone, polish, and grind the concrete to Class-B or Class C aggregate exposure, processing in several passes with progressively finer bonded diamond abrasives exposing the aggregate. The floor is then densified, polished, and treated with stain guard.

Grinding on an open slab. We hone, polish, and grind the concrete to Class-B or Class C aggregate exposure, processing in several passes with progressively finer bonded diamond abrasives exposing the aggregate. The floor is then densified, polished, and treated with stain guard.

Grinding on an open slab is inherently better because of the dust created.

Grinding on an open slab is inherently better because of the dust created.


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Scoring on an Open Slab

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The concrete on a new slab is softer and ideal for scoring.

Click on the image above to See our Diamond polished Concrete Guide.

Click on the image above to See our Diamond polished Concrete Guide.

Class B - is ground to show leave some percentage of cement fines whiles exposing the smaller rocks

Class B - is ground to show leave some percentage of cement fines whiles exposing the smaller rocks

Class C - some percentage of cement fines left showing more of the small to medium rocks.

Class C - some percentage of cement fines left showing more of the small to medium rocks.

Class C - Most of the cream of the concrete is ground off and polished

Class C - Most of the cream of the concrete is ground off and polished

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  • If floor is to be scored without borders ideally that should happen before framing.


Part II: After Dried in, Before Drywall

  • If the walls are already framed, we can either score to a border or to the walls with a hand held tool to cut lines up to the walls. Some change in the texture of the lines should be expected in this instance.

  • When using foam insulation, schedule floor and covering beforehand (that stuff sticks to concrete well enough to require grinding to remove).

  • Finishing to Class A aggregate exposure should happen after the house is 100% dried-in, but before installing drywall.

We use dye to adjust the stain color if needed. dyes help us get shades of greys or black.

 

Part III: Final Polish

Q:What is a Final Polish?

A: A final polish is the application of a final coat of stain-guard. We polish that into the floor with an 800 grit diamond-impregnated pad on a propane-powered burnisher. The final polish is not a cleaning service. We budget roughly one hour per 1000s/f to get it ready for stain-guard and polishing. This can be omitted if you like how the floors look now.

Q: When Should the Final Polish be scheduled?

A: At the end of construction, after appliance installation, plumbing and electrical trim-out, and amid the final cleaning. The floor needs to be clean and dry for that, but it makes a little bit of dust so it should be scheduled at the very end of your project but still expect your clean up crew to do a final touch up.


Q: Should the masking paper be replaced?

A: Painters and the drywall guys can be really messy and the trim carpenters work really cleanly. The paper around the perimeter of the room may require replacement while leaving ram board intact.

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