hi, i have removed the old shower tiles and the surface has the old thin set on the floor in spots. i also, took some of the mortar out with the old tiles. do i need to resurface the floor with new mortar and fill in the low spots and smooth over before laying the new tiles? this is my first tiling project. thanks, mike

charlotte234s

I would because if the surface isn't flat you may have an uneven floor and that may cause tile cracks and breaking in the long run.