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Fixing Mold Damage

What you see here are the decayed remnants of gypsum backer-board. Anyone want to tell me about the advantages of using this garbage in a shower ... speak up and tell us all, because for the life of me, I can't figure out why contractors won't get it into their heads that gypsum products and water just don't mix.

The gypsum backer-board was soaking wet, moldy and decayed. I wish I could have taken a photo of the tiles before they were removed so you could see the dark stained and cracked grout. Some of the tiles were already fallen off. My customer has been complaining of headaches and she feels it is because of the existence of mold, and after what I've seen here, I'd have to agree.

Mold is a serious health issue and it's time builders, renovators and especially the authors of the various provincial "Building Codes" take notice and change the standards for ceramic tile and stone setting especially in wet areas like showers and steam rooms. The Terrazzo Tile and Marble Association of Canada (TTMAC) have very clear guidelines which if had been applied, would have prevented this demolition.�
This shower is like all the others in this condominium and I'm sure they are also decaying and infested with mould.�
Look at the rust!

The water damage is quite excessive. Thankfully the floor in each unit is concrete otherwise the structural damage could have been substantial.

The slab over the liner is saturated with water.
The weep holes are plugged ..... but with everything else wrong with this shower, I'm not surprised.

There's also no pre-slope under the liner, so even if the weep holes were unplugged ... there would always be at least 3/8" of water inside the liner causing the slab to stay saturated.

Yep ... right up there with rocket science.
I couldn't remove the screws without them breaking, so I ended up tearing off the upper portion of the flange which I'll replace with a new section after the liner is installed.

You can see the 3 holes I drilled for the new screws.

The liner is installed and the drain is assembled .... the weep holes beside each screw is free and clear.�
A: Is the material (drywall) which was behind the old backer-board. It is covered with a new layer of vapour barrier. A vapour barrier was never used in the previous construction.

B: I've installed a vapour barrier on all the walls and ceiling.

C:�The liner is only up the wall 7 or 8 inches.
The cement board has been installed, taped�and mudded. I'm applying the final layer of mortar for the top slab over the liner.
The curb is complete.�
A small addition before I waterproof.�
I'll wrap Kerdi around�the seat and up the wall another 12 inches above the seat.
Water will never penetrate into the slab, it will never wick up into the backer-board and it will never cause water damage. MOLD will never grow here.�
Now that the Kerdi waterproof membrane is installed ... I'm ready for tile.�
Another little add-on. The hole for this "Niche" is only about 3 inches deep.
I've installed pieces of 2"x2"s along the inside edge to support strips of cement board. It doesn't have to be pretty .... just needs to hold everything in place.
I put a piece of cement board on the back first before placing strips along the sides. The inside and outside edges are taped and mudded with thinset mortar.
I've used Laticrete 9235 to waterproof the "niche".
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