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If you did use granite on the floor, unless it was honed, the slip factor on a scale of 1-10 would be a 12.
When we have snow on the bottoms of our shoes, the tile and wood slickness is about the
The granite tile I installed ran about $5 a sq ft...but I have also installed a lot of granite that started around $2 a square and ran to over$12.
Granite will be one of the most durable surfaces you can install, if you chose a color that hides dirt...some much the better.
I install 2 colors of granite in our living room as well, a black along the windows...for thermal storage in the winter and to provide a water proof surface for our plants. The other color (Lady Dream B) has colors that are picked up in our woodstove's field stone surround.
As for wood, yes, you are right about warping. But wood can be used for floors in the kitchen-I would not recommend using it in a bath, unless it was something like ipe. You just have to understand the possibility that there might be damage to it and figure the cost of repairs into the installation cost. When you make your decision you have to balance the advantages and disadvantages of your choice. Granite is durable and attractive, but is hard (both for feet and sound) and can be cold, unless you install infloor heat. Wood is more resilient-especially if you install an underlayment, and is a better insulator, but subject to water damage-but how often to kitchens flood? You don't want to put in anything that is going to be a headache. But you also don't want to put in anything that you aren't happy with, so every time you go into the room you feel a pang of regret that you didn't do what you wanted, and paid a lot of money just for that opportunity.