Is hardibacker waterproof

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Reader question: Hi there. I recently finished grouting my tile surround in my shower. I posted photos on Facebook and somebody questioned whether I had waterproofed the Hardiebacker board. Much to my dismay, I had never even heard of this…. Anyway, I went to the James Hardie website and see nothing about waterproofing being required… In my research, and reading forums, it seems quite evident that it is needed.

Is hardibacker waterproof

HardieBacker sheets are secured directly to wall studs with water resistant green screws called Backer-On. The screws have specially designed threads which can drive through cement board. While the boards themselves are water resistant, the seems, inside corners, edges and screws are vulnerable to water penetration. This means HardieBacker board needs waterproofing. Before you install any tiles, all the seams, cracks, screws, edges and inside corners need to be properly sealed and waterproofed. Most tile installers even recommend sealing all the large flat areas as well. This ensures no water can penetrate through the cement board and onto the framing which helps prevent rot, mold, mildew and deterioration. This is ideal for areas like bathrooms and kitchens that have high amounts of moisture and water. However the seams, screws, edges and corners are still vulnerable and need waterproofing before you tile. Simply installing HardieBacker or other cement boards on your shower walls does not make it waterproof. There will be seams between boards and in the corners as well as screw holes that are vulnerable to water penetration. For this reason, you must always use a waterproofing membrane like RedGard on top of HardieBacker before you tile. Mortar and grout are both cement based masonry products that absorb water. Moisture can come from both direct and indirect sources. This could mean direct splashing from a shower nozzle or indirect moisture due to steam or humidity.

Therefore as far as the Tile Council of North America is concerned no structural damage will be caused to the studs or structure, is hardibacker waterproof. Within 6 months, the wall area behind the plastic closest to the shower became densely packed with mold. We have is hardibacker waterproof rain shower head also with regular drywall on the ceiling.

Senior Contributor. User Name Remember Me? Read This]. View First Unread. He said he has to use special membrane tape at edges where each board meets to seal it and in corners. Attached Images.

HardieBacker sheets are secured directly to wall studs with water resistant green screws called Backer-On. The screws have specially designed threads which can drive through cement board. While the boards themselves are water resistant, the seems, inside corners, edges and screws are vulnerable to water penetration. This means HardieBacker board needs waterproofing. Before you install any tiles, all the seams, cracks, screws, edges and inside corners need to be properly sealed and waterproofed. Most tile installers even recommend sealing all the large flat areas as well. This ensures no water can penetrate through the cement board and onto the framing which helps prevent rot, mold, mildew and deterioration. This is ideal for areas like bathrooms and kitchens that have high amounts of moisture and water. However the seams, screws, edges and corners are still vulnerable and need waterproofing before you tile. Simply installing HardieBacker or other cement boards on your shower walls does not make it waterproof.

Is hardibacker waterproof

Reader question: Hi there. I recently finished grouting my tile surround in my shower. I posted photos on Facebook and somebody questioned whether I had waterproofed the Hardiebacker board. Much to my dismay, I had never even heard of this…. Anyway, I went to the James Hardie website and see nothing about waterproofing being required… In my research, and reading forums, it seems quite evident that it is needed. I am not somebody that skimps out or cuts corners. Furthermore, the last thing a contractor needs is for the whole Facebook community to be criticizing how a shower was constructed.

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Then set and fasten the tub as required by the manufacturer, then Flexwrap over the flange onto the Grace, then finish Grace as high as needed. Create mortar bed with appropriate slope, 4. Find More Posts by Lazarus. If the boards are installed correctly and the frame is strong, you should feel no movement. Cut the mesh to length and push it into the wet waterproofing layer. Sorry to hear about the frustrations. Mortar and grout are both cement based products that absorb water. The spray overlapped onto the durock. My question is going to be totally different, from a tile project. The previous shower had a small hairline crack in grout where horizontal and vertical edges met at top.

Durock is a cement board reinforced with fiberglass while HardieBacker contains cellulose fiber so it is a fiber-cement board.

It sounds like your old shower was built using method 2 and when a leak developed at one of the corners of the bench, you no longer had a waterproof shower. Also, do not use plastic behind and a surface waterproofer, use one or the other. I have a very large canvas painting, that I would like to put outside in the Florida sun. The toilet needs to be replaced and the sink counter top needs to be replaced. Or would that cause further issue? It should be more clear that water management is necessary. Would the thin set mortar dry and set well ceramic tiles over a primed hardy backer board? What are your thoughts? With cement board, a vapor barrier is still required. Once the first layer of waterproofing is dry, apply a coat on all screw holes, corners, seams and flat areas. In the case of the reader above, the Facebook criticism was harsh but the internet is helping to get instructions out that cement board manufacturers have been hesitant about. Mold can be very dangerous to have in your house and spreads quickly. Push it into the waterproofing layer just like taping wet spackle.