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Hardibacker board vs Cement Durock board

292K views 41 replies 17 participants last post by  scooterton 
#1 ·
Hello,

Last year I remodeled my son's bathroom and used cement durock boards for walls and floors for tiling. This year I am planning to remodel my bathroom. I am going to put new walls with tiles around tub and shower and new tiled floor. I went to HomeDepot and salesman recommended me to use hardibacker boards instead of durock cement boards because it is easy to cut them. However, I am not sure about Hardibacker boards reliability in wet areas.
Any opinion or suggestion please?

Thank you.
 
#34 ·
tnesbitt said:
We have a 4' by 6' entry way that I am going to tile in a porcelain tile. I have a depth of 15/16". Wondering if I should use Hardibacker, Durock or Wonderboard and whether I should use 1/4" plywood (sealed) and 1/4" CBU or 1/2" CBU? What can seal plywood if I have to use it? It will get some wetness because of coats and umbrellas but not much.
You should probably start new tread but what's under your entryway for support and subfloor?
Cbu need to be 1/4" for floor and holds no structural strength for tile.
 
#35 ·
There is a subfloor (called carlap?) that consists of diagonal 2"x8"s that run across the entire house (two story walk out basement). The entry is on the top floor (away from the walk out to back yard). Structurally quite strong so we are looking for something to stabilize the CBU (plywood?) and then waterproof it.
 
#36 ·
tnesbitt said:
There is a subfloor (called carlap?) that consists of diagonal 2"x8"s that run across the entire house (two story walk out basement). The entry is on the top floor (away from the walk out to back yard). Structurally quite strong so we are looking for something to stabilize the CBU (plywood?) and then waterproof it.
Ok and what's supporting the 2x8 planks? Under the section. 3/4" ply should be ok then cbu.
 
#38 ·
#39 ·
cement board over foam board

Hello All and happy Thanksgiving.

I just discovered DIY Chatroom and this string so I hope Jaz or others are still checking it.

I have a question about applying cement board (Durock style or Hardi) over foam board. I recently stripped a walk-in shower that was installed on a 2nd floor. The shower was improperly installed and that resulted in water leakage so even wood needed to be replaced. One additional point is the shower is on two outside walls facing south and west, half of which are out side walls and the bottom half are with a foamed attic so essentially conditioned space. Lastly the location of the house is in a high humidity gulf coast setting. I note this because it plays to the importance of proper vapor barrier placement.

Exterior wall is Hardi Plank>Tyvec>OSB>fiberglass. Historically this left the shower very cold in winter. As a result I want to add insulation before closing the walls. Having the exterior walls spray foamed is cost prohibative so I am thinking of using 1/2" foam board between the studs and the cement board. Since the foam board is foil faced on both sides it is also an effective vapor barrier. The two inside walls are uninsulated and would remain so.

My question is this : If I treat the surface between the cement board and the tile with a barrier such as a Kerdi type of membrane or liquid like Redguard do I run the risk of trapping moisture between the foam board and cement board?
 
#40 ·
Green eBoard cracks wildly

John applauded Green eBoard earlier in this thread for its workability. But for temperature fluctuation tolerance, it's a fail. I had to tear out a large install 3 years later. Large cracks developed. And the company refuses to stand behind this product.
 
#41 ·
I am so glad I came across this discussion. I am having the same debate currently for one of the bathrooms.

I am installing granite in my bathroom (wall ... not tile). The 1st contractor who came out replaced part of the wall with green board. He is not being asked to come back after seeing what he did. I will do a DIY project. I personally know 3 other people who do contract work, Each one has told me something different. The debate:

Replace the drywall? what material to use?
put up hardibacker or cement durock, on top of purple drywall or a different material then use the membrane?

This is a safety issues since the wall will be holding a 400 lb rock on it.

Any advise would be helpful. Thank you for your time!
 
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