Unlevel concrete slabs & RaceDeck

[civicdrivr]

New member here - I did a quick search but came up empty on this topic.

I have a 21'x19' garage with a concrete slab that has two expansion joints (breaking the slab into four quadrants). The strange part is that the half that is closer to the overhead door is about 1/8-1/4" below the opposite half (hopefully that makes sense without photos).

This hasn't bothered me too much, but I've been looking at adding RaceDeck FreeFlow flooring to my garage. Is my best option to use a leveling compound to make up the difference and level the floor to the best of my abilities, or will the tile be fine over that variation?

 

[RaceDeck1]

A lot of customers use leveling concrete under RaceDeck to smooth out dips and large uneven cracks with great success

 

[kartracer23]

What about around a center drain? If I throw a 4 ft. level across it, I've got a gap of about 1/2" to the drain cover. So I guess that would work out to a slope of 1/2" per 2 ft. The rest of the garage is a more gradual slope, but it is pronounced around the drain-maybe 3 or 4 ft. out radially. Will it 'settle' around there or will it sort of depend on where the joints in the tile land? Obviously don't want to build up around the drain since that's the only water exit.

 

[civicdrivr]

A lot of customers use leveling concrete under RaceDeck to smooth out dips and large uneven cracks with great success

Thanks! Is there an acceptable variance that the can exist with the FreeFlow tiles? Or does the floor need to be as flat/level as possible?