I usually try if I can to have a sheetrock to backer board seam fall so the tile over laps the sheetrock about an 1 1/2". Then use cement board fiberglass tape and more thinset to tape the joints. Just finish it with a setting-type joint compound, which comes in 25-lb. Now you can take your cement backerboard (or whatever your substrate is going to be) and place it up to the edge – leave about a 1/16″ gap between the backerboard and drywall. This is a retro fit shower enclosure application. Apply some thinset to the gap. If you plan to finish the joint for painting, use regular, lightweight joint compound for the top coats after the mortar hardens. Answers. Do not use 1/4" USG Durock® cement board for wall or ceiling applications. Instead of water resistant sheetrock I use Durock, or Backer board. Pro tip: Don't worry if you get cracking on the first coat; just mix the next coat a little thicker by spooning in some fresh mud from another bucket. Be sure to fill the gaps between panels with polymer-modified mortar and embed fiberglass mesh tape. Also used the right mesh tape BUT mixed up a batch of joint compound instead of thinset and covered all the screws and joints. If wallpapering, prime surface of HardieBacker board with a primer suitable for high-moisture areas as recommended by the wallpaper manufacturer. You end up with a butt joint wherever short edges meet on a wall or ceiling. You may also want to consider, Model # 50-555 - Roberts Duct Tape is a vinyl, fabric reinforced tape. July 25, 2018 at 9:24 am. Asked by HoneyDoThis September 14, 2020. Leave the perimeter gap open for expansion joints. --Hardi says not to use paper tape---alkali environment will destroy it. Answer. If you thinset each seam before you begin any tiling, you'll have a slightly raised area which can be fussy once you start tiling. Keep in mind, that tiling board seams are not like dealing with drywall...it doesn't need to look pretty and the tape doesn't need to be embedded fully, it will be when you add the thinset and tile. *Some application areas may require additional waterproofing. DuraRock is up and seams are all taped and have thinset on them. Once joint tape and compound are applied, a slight bump is formed and even a highly skilled professional has a difficult time hiding the joint, particularly under certain lighting conditions. Take a trowel or a taping knife and use it to apply the thinset to the gap. My son said spring may come yet to Rochester MN where he resides. Stupid Mistake - Joint Compound on Hardibacker. Follow the liquid waterproofing membrane manufacturer application instructions. Everwhere hardi is concerned, I taped with a proper hardi-tape and thinset. Use the same mesh tape for the corners. Hello, We are tiling our 3 shower walls. STEAM ROOM APPLICATION HardieBacker® board is recognized for use in residential steam rooms when installed … Fasten the panels onto the studs using the same 1/8th-inch spacing as a floor installation. Outside of the shower, the hardi continues for a bit, but then i transitioned to greenboard drywall, as i'll be half tiling and half painting. The shower stall is completely made of hardibacker, floor to ceiling. If you encounter a situation where there’s a wide gap (anything more than 1/4 of an inch) between two pieces of drywall you can fill the gap first with drywall compound. If you thinset the tape (like you would during a normal sheetrock install) then apply more thinset and rake out you'll avoid the humps and bumps. Above this I mud and taped the corners and did a thin-coat of joint compound. Use these, and plan for your tiles to extend just past the border where the greenboard starts. Becky says. The Mold-X10 fiberglass mesh tape is made for drywall seams and intended to be coated with joint compound. The only one that has specific requirements is schluter. It is the material that you use underneath the backer board to attach it to the wood subfloor. • When complete waterproofing is required, seal all joints, edges and fastener penetrations with a liquid waterproofing membrane. Don't worry if the tile doesn't cover the joint between the cement board and the drywall. Cement backer board is mainly used as a sub-surface for tiling. 11. Redgard has an open shelf life of about one year. Then just screw through the edge of your substrate into the other half of the 2×4. Good for drywall to cement board joints? You can also use thin-set to tape and bed joints between the purple board and cement board. After the Durock panels are in place, you must fill the joints before you can install the tile. Sigh. Work in small sections so you can smooth out the joint compound before it starts to dry. At $12 a sheet or so for backer I'd start over and do it the right way. Hardi outside of showers will be taped with ARM tape and joint compound (and textured with all purpose joint compound). As the building materials move, tension builds up against the drywall panels. Fit-It-All is not necessarily water proof, but mixed with acrylic it becomes slightly water resistant once it has dried. The alkali-resistant coating protects the fiberglass from degradation that can occur with thin-set mortar. This is similar to drywall taping. This would be done if the seam will not be covered with tile, which means it has to be properly concealed with joint compound so that the area can be painted. Don't apply joint compound where tile will cover the cement board. Setting-type compound is stronger and more water-resistant than the type that hardens by drying. Additionally building materials expand or contract as the temperature and humidity inside a building change. Drywall joints should be treated with drywall joint compound. The picture below shows a section of drywall we installed to cover up the old mirror. 3. We have DuraRock from the shower pan all the way to the 9 foot ceiling. But as long as the backer board is in place then the seams can be filled with thinset and mesh tape. Stupid Mistake - Joint Compound on Hardibacker. Great for HVAC duct work and general household uses. - joint compound? Cement backer board is often used as a tile base on plywood or OSB subfloor. bags of powder that you mix with water. 6. (It's available at home centers.) Use a 1/2-in.-nap roller to roll mud on an area about four feet square. The instructions will probably tell you to space the sheets apart about 1/16". By the way, you can also use joint compound over the Kerdi-Board if you don’t tile an area. FlexBond Crack Prevention Thin-Set Mortar is compatible with Hardibacker tile backer board. Just make sure the thin-set is a bit thin (pardon the repetitive nature of this discussion) so that when you tile the transition there won’t be a hump that will make your tiles look offset. Regular drywall is not appropriate. As for the intersection of the Durock and greenboard, use normal joint compound in the green or blue bucket. Once you have your backerboard mortered and screwed into the sub-floor, you will want to fill in the seams with the same mortar you are using for your tiling project, then tape the seam with some fiberglass tape designed for backerboard (drywall type wont stand up to mortar over time). You must use ARM mesh tape. This joint tape product is used for seaming most types of cement backer board and tile underlayment. HardieBacker® cement board is made better to install better and perform better. 12. Reply. Or, you can apply RedGard Waterproofing and Crack Prevention liquid to the face of the WonderBoard. Durock, a name brand cement board manufactured by USG Corporation and sold throughout the United States, is suitable as a backer board for tile. 10. The best tape to use if the seam connecting the green board to the cement board is Mold-X10 if the seam is going to be coated with joint compound. For tile backer board such as Durock, Wonderboard, Hardiebacker, Permabase, ... What should go over the cement board so it roughly matches the finish on the drywall in the rest of the room? Cement board, available in 4-foot by 8-foot panels, is standard for use as a tile backer board. Close. Hey sciubbalargo, that is a good question, the process is very similar to doing drywall. You can skim coat hardibacker with drywall compound, no problem. All the cement board joints were done with thin-set and not joint compound. That’s why it was named the most preferred brand of backer board by tile installers and contractors, according to the 2019 Tile and Stone Report conducted by ClearSeas research in partnership with the National Tile Contractors Association and TILE Magazine. Likewise, people ask, can you use backer board instead of drywall? Archived. 1. Fiberock® Brand Underlayment provides a smooth, flat surface that resists swelling and contains none of the resins, adhesives or solvents that can stain floor covering materials. Cement backer board on concrete as a subfloor or underlayment is usually not recommended or needed. You need to make sure that the entire gap between the boards is filled up with the thinset. You can build up multiple coats of joint compound to disguise the ridge made by the tape underneath. If this can't be done and the last vertical row of tile falls on the backerboard, I still finish the joint between the two with mortar for the first one or two coats. In most cases, you can apply tile directly to … Make sure you measure whatever product you’re using for your substrate. Don't use an unapproved fastener, and don't skimp on the number of them. We're turning a corner tub into a shower stall and used hardibacker for the walls. For the joints I use a mixture of Fix-It-All and liquid acrylic (Acryl-60 or any of those). you can use fiberglass tape with thinset to span the gap, but you may want to use some joint compound to have a smooth transition coming out from under the edge. You can use joint compound but ordinary joint compound dries by evaporation, so if you need a thick application it will take a long time to dry and will develop cracks while it sets. You can use any good modified thinset over redgard. Paint HardieBacker board as you would drywall. DetailsButtboard™ Drywall Backer installs between studs on butt joints, and pulls back the edges - creating a tapered edge that requires less joint compound to finish. FibaTape's Cement Board Tape is the product for cement board. Posted by 1 year ago. Use the same mesh tape for the corners. Also, I use fiberglass mesh tape instead of paper. Yes, you can use that thinset and you definitely don't want to use drywall compound! For further assistance please contact us at 1 800 282 8786 option 2. 13. It also offers greater resistance to indentation than other underlayment products and can be used in all areas — wet or dry — regardless of the flooring material chosen. 9. If you have never done drywall mudding before, please note that it is hard for a first time DIYer to get it to not look like a terrible awful ugly pile of pain and tears (don't ask me how I know this). You will also use it to attach the tile to the backer board. For example, I used the panels for the entire shower wall, however, I only tile up to the showerhead or so. ↩ Robin. Dave Taylor. USG Durock® cement board is not designed for use as a structural panel. If you have a foam backer board then those can adhere to a wall but I’m not sure that’s what you mean? Maximum installed weight of the finish system should not exceed 15 psf. Then, you can place the fiberglass drywall joint tape over the seam. Asked by Fallentiles August 1, 2020. Do not use USG Durock® cement board with vinyl flooring. Step 2 - Apply the Tape. Do not use drywall joint tape. Not sure if that’s helpful, or not. Here's the plan and the questions: Hardibacker 500 inside showers will be taped with Alkali Resistant Mesh tape and thinset. Only where greenboard meets greenboard (out of, and far away from the shower) did I use joint compound. Redgard is approved for use over drywall, but drywall joint compound is not the right thing for filling those joints according to the cement board manufacturers, and thats the wrong tape as well. HardieBacker ® Cement Board with ... • Do not use all-purpose joint compound or paper tape. 05-03-2008, 11:06 AM. 2 | Texturing Texture can be applied to HardieBacker board in the same way as drywall.