2 rip it out and start over shimming and leveling to get sq.
How to level bathroom walls.
With a 3 16 v notched trowel spread mastic just under the laser line and down the side of the tub wall to a small area.
The drip drip of water down the bathroom wall that condensation is caused when hot steam hits cold walls.
Your foundation may not be the problem.
It also happens most in bathrooms where poor ventilation means it takes ages for the room to dry.
In some cases pouring floor leveling compound will fix the problem.
Instead it may be an issue with joists and beams below your floor that require shoring up.
Look at the wall surface carefully.
Use a 360 degree laser level to mark a line for laying the tiles.
Once you are ready to lay the tile start at the corner with the chair rail border image 2.
If you re not sure of the cause of a damp patch on a wall try the foil test.
Things you will need measuring tape tile wet saw leveling spacers and wedges trowel thinset mortar rubber mallet grout grout float grout sponge.
3 use your idea of skim coating and waste many hours trying to get it perfect.
You ve probably noticed that condensation is worst on outside walls and around the metal frames of single glazed windows.
Dry the wall surface with a fan heater then tape some kitchen foil tightly over the affected.
1 hire someone who does have more experiance than you do to tile the bathroom.