The Shower: Waterpoofing (part 2)

Once the initial layer of waterproofing was dry, I moved on to complete the installation of the 2nd layer of waterproofing: the Marmox board (an insulated & waterproof tile backer board). Because this had to go onto the rough masonry walls, I was definitely not looking forward to this - not only because of my lack of ability with a trowel, but also because I always manage to make a huge mess whenever mortar is involved. This work was similar to dry-lining plasterboard and installing the first few Marmox boards, except here I had to also deal with the arch...

The masonry arch and wall - in a rough state

A Marmox board ready to be installed - the adhesive is dabbed onto it to help level it out properly once up on the wall

Pounding in the plastic "spankers" that provide additional support with masonry

More spankers ready to be nailed

Closing up the arch using small pieces of Marmox board - the white is silicone caulk which is used to seal any joints and make them waterproof.

Applying a small piece of Marmox to the arch

The completed arch

Starting to apply the waterproof tape at the joints (additional layer of waterproofing)

The completed arch. The area on the right will be built out with plywood as part of the ledge design.