Garage Floor after Grinding before Wolverine

[rjones241]

Hey Guys,

Here's a couple of pictures of the garage floor as it stands right now. They diamond ground the floor (due to a poor troweling job) and I'm just curious if you guys think this profile is good to go for epoxy or if I need to do the acid etch. I put a beer cap in the picture for scale Everyone knows what that looks like

I've got higher res pictures but GJ limits the size to 78k. I can email the originals to anyone who is interested.

Also I've had some cracks that have grown over the two months that the floor has been poured. The one is about 1/8 of an inch wide and just a hair higher on one side (<1/16"). The pad has rebar at 18" OC, and is 5" thick, in floor heat and no crack joints either cut or cast in place. Is this something I should be concerned about? Hold off on coating to see if the floor moves any more?

Thanks guys!

 

[AlphaGarage]

It's really tough to gauge from a picture, but that looks like a good profile. However an etch might be cheap insurance. We always recommend a texture like 80 grit sandpaper.

As far as the cracks go, at 1/8th inch the epoxy should do a good job of filing them in, although the grade differential might "poke" through. If the primer coat doesn't fill it in, float a bit extra LiquaTile 1184 over them as you do the body coat.

As I recall your floor is >1,000 ft2, I'm surprised there aren't any joints. If you suspect that the floor may shift you might want to open the crack and apply a flexible epoxy, like Wolverine Coatings IntegraFlex 1921. That way if there is further movement, within limits, the IntegraFlex 921 can absorb the shifts and the visible surface will remain intact.

 

[rjones241]

Yeah, they didn't cut any joints in because of the in floor heat. If I had known they wouldn't cut them after I would have requested some poured in place joints.

Worst case I fill the crack later I guess. Flecks should hide it a bit.

 

[FL_Javelin]

Personaly, I wouldnt acid etch, the grinding acheived all the etch would and more. The biggest concern would be to get as much of the dust off as possible. Any area the floor grinder missed, like low areas or close to wall, hit with a hand grinder.

$.02