After an interlude with
tiles,
insulation and pigeons, I'm finally getting back to waterproofing our new shower. With the Marmox backer board
installed at the brick wall, it's time to start waterproofing the plywood walls so we can put the Marmox boards on them as well.
As previously mentioned, we're
using the BAL tanking system on the plywood. It's straightforward work, but rather time-consuming...
 |
| Dec 9th - starting to waterproof the plywood substrate |
 |
| The plywood fully painted with the waterproof membrane |
 |
| A detail showing where the shower valve sticks out |
 |
| The polyester tape applied at the plywood joints |
 |
| All the plywood walls are now waterproofed! |
Now that the main plywood walls are waterproofed, I have to deal with encasing and waterproofing the steel post. The problem here is - how to fasten plywood to it? If I had some of my steel-fabrication tools here (I used to build steel furniture in NYC), it would have been easier. But since I don't have that stuff (and since it wasn't worth buying a load of kit when we would only use it once), I had to get creative. I ended up using some of the large 150mm screws (6") that were left over from the
structural roof work to make a sort of plywood sandwich! This meant the plywood was fastened to both sides of the post using these long screws (going through the post) to hold them together.
 |
| Dec 10th - drilling holes for the large screws |
 |
| Setting the first piece of plywood (on the far side) |
 |
| Adding the second piece |
 |
| Now we have our plywood & steel "sandwich" |
With the post sandwiched in between plywood, it was then possible to finish framing out the rest of the corner, including the shelf...
 |
| Dec 11th - the shelf is built out |
With the plywood work finished (and the waterproofing membrane dry) it was finally time to attach the Marmox backer board. Similar to the
brick installation, one uses large washers, but here, we use stainless steel screws rather than the plastic "spankers". As before, the joints between boards are sealed with silicone and then taped over with a waterproof tape.
 |
| Starting the Marmox board installation on the plywood |
 |
| The silicone sealant applied to the joints |
 |
| The waterproof tape goes over the silicone joints |
 |
| The stopping point - before catching my flight back to NYC... |
