I am installing a Kohler pedestal sink.

Two issues.

First, the floor is tiled with 20"X20" porcelain tiles. The pedestal sits right over one tile joint and the tile in the front is a bit lower. You can see where I placed some wood shims.







What do you suggest? Should I use the wood shim and just use a razor blade to trim it even with the pedestal, then caulk all the way around? Or should I use plastic shim? Or should I apply some quick set mortar into the gap?

I typically do not use the floor anchor hole on the pedestal but use the wall anchor holes on the sink. Given that this pedestal is not on nice level floor would you drill through the tile and concrete slab to anchor the pedestal?

Second, if I align the center of the pedestal with the center of the drain on the wall, the right side of the sink will be about 1/4" from the right wall.



Should I push the sink 1/4" over so the edge is right at the wall, then caulk that edge or should I leave that 1/4" gap?



Edited 1 times.

For a pedestal sink on tile, I'll shim the base as needed and then mix up some matching grout and grout around the entire base. As for the gap, I'd pull the sink 3/4"- 1" off the wall and allow a little more gap. It looks better spatially and won't interfere with trap alignment in your case.

i would do whatever possible not to have a gap against the wall.
as for the base, it does not need to be secured to the floor with a bolt. grout would secure it. place the shims, trim them back and apply the grout. (plenty of it).

in the olden days:

shim it using 1/2 wide cardboard 'stacked' as necessary

copious plaster of paris with shims in place

after 20 minutes set time

remove shims and plaster 'gaps'

1/2 hour - voila - PERFECTION


exactly the same for a water closet

==============================================

"Measure Twice & Cut Once" - Retired U.A. Local 1 & 638

I'd use plastic shims used for toilet bowls, then use a sanded grout caulking to fill the void at the floor.
I would put the sink against the wall and caulk the joint to the side and rear walls.

a pedestal sink should be centered on the drain trap

either

re-rough the piping

or

live with the 1/4 gap

or

pick a smaller sink

or

forget the pedestal design

==============================================

"Measure Twice & Cut Once" - Retired U.A. Local 1 & 638