Concrete garage floors in Grimsby
Grimsby is a commuting town, and the QEW is a heavily salted road. Those two facts together explain most of what goes wrong with garage floors here.
Through the winter, vehicles come home coated in brine and slush and park indoors, where it all melts onto the slab and stays. Salt in solution sitting on concrete is considerably harder on it than salt lying dry outside, because the liquid carries chloride into the surface and the freeze-thaw cycle works on it from there. A floor poured dead flat holds that mixture against the concrete and against the base of the wall for hours at a time, every day, for months.
The answer is pitch toward the door, established at the pour, with a base that drains. Rinsing the floor in winter genuinely helps, but only on a slab that actually sheds water. On a flat floor it just relocates the problem, which is another argument for getting the fall right the first time. Pitch cannot be meaningfully retrofitted: a topping over a flat slab eats headroom and rarely achieves proper drainage, and the alternative is removing the floor.
Near the lake there is a second consideration underneath. The water table sits high, so the sub-base needs a real drainage path rather than being placed into saturated ground. A slab fighting moisture from below as well as salt from above ages on a much shorter timeline, and it also complicates any coating applied later.
On coatings: they work well on a sound, dry slab and they make salt, oil and winter grime far easier to clean off. They need moisture testing first. A coating applied over concrete still pushing vapour upward lifts from underneath, and no amount of care with the surface preparation prevents that.
Thickness follows use. Four inches over a compacted base handles cars. Six is right where a hoist, a workshop or a heavier vehicle is planned, and joint layout has to suit the size and shape of the bay so the slab cracks where it was told to rather than across the parking area.
We also pour the driveways that feed these garages and the walkways beside them, and cover the rest of our Grimsby service area.
Further into Niagara the commute is shorter and the salt load lighter, which is what concrete garage floors in St. Catharines covers. West along the lake the escarpment adds driveways that drain into the garage, dealt with on garage floor concrete in Hamilton.
Away from the QEW the salt load eases and the sub-base compaction becomes the deciding factor instead, dealt with on garage floor concrete in Fonthill.