When we bought our new house last year I spent a ton of time deciding between a floor-tile system or epoxy coating.
I liked the floor tiles ability to let air move underneath, which means the floor is a bit warmer if you needed to traipse through it barefoot or something. I also liked that I could just pop out and replace any damaged sections. What I didn't like was all that dirt and dust would just be trapped underneath the tiles, and water from melting snow and the like would just drip through and, if it didn't make it to the floor drain, become stagnant.
I researched epoxy coatings and found that if the floor is properly prepared the coating shouldn't fail on its own. The epoxy quality matters as well, the store bought stuff has a longer working time for the DIYer versus the 100% solids epoxy the professionals use. The cost was more expensive due to the prep work, I think the tile system would have cost me about half to two-thirds the cost of the professional epoxy coating.
In the end I went with the epoxy flooring. The decision came down to three things:
1. Epoxy will actually "seal" the concrete, no more dusting - which would have continued to build under the tile flooring.
2. No worries about anything getting stuck under the tiles, or having to eventually pull them up to do a clean out under them.
3. Aesthetics. Admittedly a vain thing but after a lot of looking I could never find a floor tile system that just didn't end up looking beat up to hell after a few years unless you religiously maintained it. Epoxy would let me just hose and sweep or pressure wash it down now and then, and again, without having to worry about whether the water was actually draining right under the tile.
I picked a company local to me: they diamond ground the floor, acid etched, and then thoroughly cleaned it before laying down the colored primer layer of epoxy. Then another layer of colored epoxy, then a layer of the various sized chips to make the floor style I requested, then two top coat clear layers of epoxy, and a final UV protectant coat. 25 year guarantee against premature failure AND physical damage on top of that.
Cost was a tad over $4200 for a 700 sq ft garage. I haven't regretted it a single moment since I got it, and it keeps the S4 happy :P I did have to rush to get some paint up on the walls though, since I knew any mess I made before the epoxy would be cleaned up when they ground the floor haha. So it looks a bit unfinished. It's all finished out now and looks great.
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