The final push to finish the bathroom waterproofing has come down to today, which is a Sunday - my flight back to NYC is late tomorrow afternoon, so anything I need to do has to get done by the end of the day today.
This will include affixing the waterproof tile backer boards (Marmox boards) to the walls and floor that will be tiled (outside of the shower). These are the final bits of waterproofing, and this will allow our tiler (Sean) to complete his work. Since I'm leaving tomorrow and he's still going, it's become apparent that his work will (unfortunately) only be finished after I've gone. This makes the perfectionist/architect in me nervous, but I've seen over the past week that Sean is very meticulous and we've spent a lot of time going over all the details and issues...so hopefully it will be OK. But "Aglaya" is going to have to step up and take charge after tomorrow!
 |
| Marmox boards lining the bathroom walls |
Once the waterproofing on the bathroom walls had dried for 24 hours, I was able to apply the waterproof tile backer boards (Marmox boards) Sunday afternoon. Similar to the shower, after the boards are fixed to the waterproofed plywood, the joints are sealed with a waterproof silicone bead, followed by waterproof tape.
 |
| After removing the loo |
After the walls were completed, it was time to focus on the floor - I had been nervous about this, as it involved removing our loo (toilet) in order to fully waterproof the floor below. Fortunately it went relatively smoothly and was easy to remove (with a little help from "Aglaya").
 |
| The plywood under the loo waterproofed, and the 1st batch of flexible tile adhesive ready to go |
With the loo out of the way, I quickly applied the waterproof membrane to the plywood and after it was dry enough (could not wait the 24 hours this time!), I prepped for putting the Marmox boards on the floor. This involved pre-cutting all the boards so they would fit, and then mixing smaller buckets of the tile adhesive.
 |
| The first batch of the flexible tile adhesive spread out on the floor |
It's worth pointing out here that I had ordered a special type of tile adhesive for the floors. Wood joists with a plywood sub-floor are not the best base for tile because they have a tendency to subtly move due to expansions/contractions in the heat/cold. In an old Victorian building like ours, movement could even be caused by large truck driving by outseide. These very small movements have a tendency to make tiles -- or the grout lines between them -- crack, so one has to minimize the possibility of movement, while still accommodating for some movement. Here I had fixed the plywood with as many screws as possible to make the subfloor as rigid as it could be, and will then apply a flexible tile adhesive that is designed to go over wood subfloors. The adhesive will fasten the Marmox boards to the floor (minimizing the transfer of any vibrations or movement) while the Marmox board itself will provide a very rigid and inflexible base for the tile. The hope is that this carefully thought out system will minimize any cracking of our large, beautiful limestone tiles...
 |
| The 1st Marmox board in place on the floor - using some sacks to hold down the boards in a few areas |
 |
| Yours truly placing the 2nd Marmox board in place |
 |
| Spreading the next batch of adhesive |
 |
| A close-up view of the adhesive - one uses a notched trowel so the adhesive grabs the boards better |
Mixing smaller amount of the adhesive made it easier to work with, and within two hours I had all of the Marmox boards in place. Similar to the walls, beads of silicone are placed bewteen the joints, and then taped over with a waterproof tape.
 |
| The silicone between the joints (on the left); the silicone covered by waterproof tape (on the right) |
 |
| After the work is completed, the loo is fixed back in place |
By the end of the day (10pm!) the bathroom floors and walls were completed, and ready for the tiler to carry on with his work in the morning...
