dadwolf2 wrote:
I was wondering why you are getting accumulated water in the garage in the first place? Seems to me you could possibly incorporate both ideas. Make the floor primarily level with a centrally located floor drain and use open grated drain at the front?
But we only get 4" annual rain with very infrequent freezing so I'm no expert here!!
Most of the moisture up here is a result of driving in snow which accumulates on and under vehicles. It then melts inside. A co-worker did his garage with sheet drain to the garage door (a nice wood garage door) and it is wrecking havoc on the bottom rail. He is now kicking himself for not putting in a center sloped drain.
But yes, the best of all worlds is a french drain in front with centered drain with 1/8" sloped flatwork towards it.