I'm in the process of doing my bathtub walls and I'm thinking of using Denshield™ boards. My total area is 55 sq ft. I found 4'x8' Denshield™ sheets so I will need to buy two sheets to cover my area (32+32=64 sq ft).
I will end up with having two seams at the top of the shower that will later be covered by the tile (see image).
The manufacturer says that there is no need to use a liquid membrane (like Redgard). Instead, I just screw them down with corrosion resistant screws, tape and thin set the seams, then use 100% water-proof silicon caulk in the corner seams. They said that it's guaranteed to last for a long time.
My concern:
- Are Denshield™ boards better than cement boards?
- Is it a good plan to have only one seam in the middle area at the height of 4' from the tub deck and one seam in the right area also at the height of 4'?
![enter image description here]![enter image description here]
Best Answer
Whether one product is "better" than another is really subjective. What I can tell you is that denshield is a more advanced product, eliminates the need for a membrane, and I find it easier to use than cement board for sure
However, I would get four sheets instead of three. Then you only need to have three vertical seams, total: two corners and one along a stud. Vertical seams in sheet goods are objectively better. They will be better supported, and you'll have minimal seams (as that seems to be the likely concern).
Plus, with no horizontal seam you don't need to be concerned that water can run laterally and seep through a poor seam.