Flooring for the main level: Part 1.
When I showed up on site the guys were already there and ready to start (Photo 1-2). The equipment they use is part of the Husqvarna HiperFloor finishing system. There are several walk behind grinders which have interchangeable grinding heads which vary in grit from very coarse to very fine. working through grits can give a finish that looks like mirror. Each grinder has the ability to be connected to what looks like a cyclone dust collector (Photo 1-2). The result is much less dust than traditional grinders.
In the initial stages it is a matter of determining what type of exposure is desired: i.e. how far to grind and therefore how much aggregate to expose. Deeper grinding leads to larger aggregate exposure. I find this look too busy. Instead, I opted for something more subtle: a little beyond a salt & pepper finish. For this space I felt like it made sense. It took some time to get a feeling for the hardness of the concrete and to strip the initial sealer (sealer was used to prevent the slab from drying to fast during the warm summer months.)
After working through several grits (starting at 20), the slab exposure starts to take shape. Once the slab is ground smooth, grits are changed in order to get a smooth finish with a high degree of polish. A densifier is added to the slab and allowed to dry. After that, the slab is further polished and sealer is used to protect the surface. The slab is then polished for the final finish.
At this point the guys just have a few minor touch ups.....then we'll have the final reveal!!!
Photo 1-1. Sam Roberts and his crew on site. Ready to take on an exciting project!