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Fistor
07-14-2008, 11:15 AM
Hi -

Looking for opinions on the usage of cement board vs. DensShield behind tile for a tub enclosure.

My understanding:

cement board:
- durable
- allows moisture through, but provided that you have waterproofing behind it, it won't be a problem.
- more difficult to work with than DensShield
- worse looking finish if you wish to paint portions of the cement board (outside of the tile extent), even if you prime then place drywall compound over as a base for the paint

DensShield:
- light
- water resistant - provided that the surface covering remains intact
- easy to work with and finish (compared to cement board, that is)
- can degrade if moisture gets in

My inclination is towards the cement board, despite the finishing issues I may face later - after all, if the DensShield ultimately gets wet and degrades, then the finish doesn't matter anyway), but I wanted to hear what all of you had to say.

What do you think?

jadnashua
07-14-2008, 12:43 PM
I'd use the cbu...no mold food, won't degrade if it does get wet. You could apply a surface waterproofing like RedGard if you wish. CBU will absorb moisture if it gets to it, but will not degrade. Make sure to use the special mesh tape on the joints. You can apply this while tiling, it's for strength, not for show like on drywall - you don't want a hump there, so installing the tile while it is in the soft/pliable thinset prevents 'speed bumps'.

rbird7282
07-17-2008, 07:16 PM
Hi -

Looking for opinions on the usage of cement board vs. DensShield behind tile for a tub enclosure.

My understanding:

cement board:
- durable
- allows moisture through, but provided that you have waterproofing behind it, it won't be a problem.
- more difficult to work with than DensShield
- worse looking finish if you wish to paint portions of the cement board (outside of the tile extent), even if you prime then place drywall compound over as a base for the paint

DensShield:
- light
- water resistant - provided that the surface covering remains intact
- easy to work with and finish (compared to cement board, that is)
- can degrade if moisture gets in

My inclination is towards the cement board, despite the finishing issues I may face later - after all, if the DensShield ultimately gets wet and degrades, then the finish doesn't matter anyway), but I wanted to hear what all of you had to say.

What do you think?

I would use a product called Wedi board. It is 100 percent waterproof and very lightweight. Easy to work with. Won't degrade.