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, is hardibacker waterproof, the seems, inside corners, edges and screws are vulnerable to water penetration.

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. Sponsored Links.

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. However, after researching the manufacturer instructions for each backer board I find the confusion on the matter is understandable. A waterproof membrane or vapor retarder membrane must be specified to prevent moisture intrusion and protect adjacent building materials. This seems quite clear. Update : Custom Building Products has changed its stand on this since I originally wrote it. Here is the latest:.

I would still want a bonded membrane waterproofing on the surface. I dunno. What are your thoughts?

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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.

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.

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He will be adding a membrane over the entire shower floor and there are membrane pieces over the edges. They get a lot of water too. From the things I've read over the years, it seems like there are two basic ways to build a shower bench: 1. Create a bench where the sides of the bench are effectively a part of the shower's waterproof layer. This means HardieBacker board needs waterproofing. I have a question. While the boards themselves are water resistant, the seems, inside corners, edges and screws are vulnerable to water penetration. The screws have specially designed threads which can drive through cement board. The dampness will not be a problem because the cement board is hefty and breathable. That answer significantly lowered my chores to sitting on the couch ratio!

Durock is a cement board reinforced with fiberglass while HardieBacker contains cellulose fiber so it is a fiber-cement board. Durock is lighter per square foot, more durable, more rigid, and less expensive, and can be used on walls, floors, ceilings, and both inside and out.

Oil primers attract mold as the oil in the primer is a mold food, similar to how mold can form in diesel fuel. Make sure you have a good amount of product in the corner seam. Mold can be very dangerous to have in your house and spreads quickly. Welcome, Julia. Last edited by cx; at PM. So when showering the water went through and because there was zero sheet membrane, liquid membrane or any other waterproofing- it went through the entire ceiling and spread quite a bit onto the ceiling of the kitchen causing this problem. Warm temperatures. I have not yet seen nor used any of the new Hardibacker product. If you want your HardieBacker board to be as waterproof as possible you need to install it correctly. Search this website. Be sure to overlap the tub flange. I would like to create a curbless shower on concrete slab. The way you apply your mud, tile and grout can help waterproof HardieBacker board in wet areas. Do I need to knock out the drywall mud between the ceiling and the durock?