Asked 3 weeks ago by britcharlie. Then apply a generous amount of thin-set to the bottom bathtub tile and position it 1/8 in. Typically you would need to use 1/4″ furring strips to make the studs flush with the tile flange on the tub. Posted by 4 years ago. A single bead of caulk can fill gaps up to 1/4 inch. Instead, first, remove the existing surface material, then install the cement board over the studs and membrane, as applicable. Because cement board can be used either for floors or walls, the surface below the cement board will vary: In such wet areas, never install cement board directly over drywall or green board. Caulking the Gap If you can reduce the gap to 1/4 inch or less, you'll be able to fill it with acrylic latex or silicone caulk. Water will go through the grout, through the cement board, through the poly (or worse accumulate between the cement board and poly) and rot the cement board. Run the waterproof membrane that is behind the cement board over the lip of the tub and stop the cement board above the lip of the tub. The cement backer board can be screwed or nailed to the wood framing. Install blocking for future grab bars while the walls are open. By having the vapor barrier behind the cement board you stop the moisture going further into the wall. Carefully lift the backerboard panel into the tub area and set it on several shims placed about a foot apart to maintain a 1/4-inch gap between the board and tub. I need some sort of waterproofing and was thinking about using HydroBan. Hondagirl, how did your project turn out for you? It will act as a vapor barrier behi… GW's resident tile guru's and GC's will probably provide further suggestions and advice as well. Archived . ¿Cuánto tiempo se tardó en construir el Canal de Panamá? • We recommend an 1/8 in gap between board edges. above the lip of the tub. There is approximately a 2” gap between the corner of the room and the bath tub. It is a very simple process and I used some Fibatape and thinset mortar to seal the cement board … • Never allow all four corners of boards to meet at one point. What is the best way of dealing (waterproofing) with this space? Apply it to the wall with the bottom edge about 1/4 in. Typically, most any … For a tub the absolute minimum is 3' up around the tub is either cement board or drywall with membrane or drywall … So, I’ve about installed all the cement board for my bathroom tile renovation around the 3 sides of the tub. That gap is supposed to be there to accommodate for expansion/contraction of the different materials. Rona, HD, HH will all have them. Otherwise, the cement will crack. How Do You Fasten Backer Board To Walls? DH says the cement board should come over the flange, without touching the tub rim/ledge itself (maybe 1/4" space). Do not align with subfloor joints. A lot of the jobs we do they don’t bother to seal to the cement board and tub, they just tile and get us to … Also know, should cement board go under tub? You’ll want to tape where the cement board backer board meets the sheetrock wallboard. There's already cement board … Sometimes your gap is larger on one side of the tub than the other due to the imprecise square of a wall, ceiling, or floor. At some point along the wall, the cement backer board will meet with the drywall used in the rest of the room. Advice needed - Tiling tub surround, but there is a gap between cement board and tub that's too large to caulk. I do tape bevels simply to make a flush surface for the tiles. If water gets to the cement board, capillary attraction can cause water to wick up into the cement backer board. Now, you can use either caulk or mesh tapes to close the gaps between the backer boards. DH is wrong. But for the record, it's not meant to be waterproofing, but only a vapor barrier, and as for being ridiculous, it IS spec'ed both by TCNA and ANSI. There are screws made for concrete board. Continue installing sheets to cover the entire floor … It may sound like a daunting task, but learning how to install cement board on a floor is possible even if you don’t have years of DIY experience. If the gap is slightly larger than this, fill it with a bead of caulk deeper into the gap, but not flush with the surface. Continue around the tub until the gap is filled on all three sides. Color the piece with a stain marker, apply glue to it and tap it into the gap under the casing with a hammer. Learn more. That's a basic tenant of all vapor barrier installations. Why is sponge Labelled as a soft material? The notion of putting poly behind the cement board by stapling it to the studs and then peppering it with screws through the cement board as a waterproofing technique is ridiculous. Not only cement board (hardi is fine) but you must go 3-4 feet up. ¿Cuáles son los 10 mandamientos de la Biblia Reina Valera 1960? To clarify; DH furred-out the studs so the hardi-backer comes down straight over our flanges (our tile guy's recommendation), so our hardi-backer does not bow out. Measure the gap and cut a piece of the casing to size with a coping saw. I'm planning to install 3x6 ceramic tile from floor to ceiling around my tub. For example, I try to create a crisp one-quarter inch gap between the cement board and the top of the tub or shower fixture. Kitchen, Bathroom and Tile firm- Harrogate, Leeds and Huddersfield. silicone). You still need a vapor barrier with cement board, although in this case the barrier can go behind the board. Fill gaps between 1/4 and 1/2 inch in width with two beads of caulk set side by side. If the gap is wider, stuff some backer rod in first. It is far more important to have a sturdy layer of ply under the tub. Click to see full answer. Tile vs. tub surround? I always leave a 1/4-inch gap between the top of the tub and the bottom edge of the backer board. Beside above, how much space should be between cement board and tub? When installing cement board above a bath, leave at least a ¼ inch gap between the tub and cement board to prevent the wicking of moisture. owenpga Member Rip 2x4s on a table saw to fit between the tub and the wall studs and then nail or screw them on top of the studs. Do you need a vapor barrier behind cement board? Either stopping the cement board above the tub flange or alternately shimming it out and dropping it down near the tub would both be good options. Which antibiotics treat group B strep UTI? It is too big a gap to silicone. This will stabilize the molding. If there are gaps between the doorframe and the wall, seal them with caulk. Close. I also try to create these same, or slightly smaller gaps … Begin flashing with vertical corner strips of peel and stick membrane … and then … Apply thin sets made of cement over the tapes on the backer boards to fix the seams of the board correctly. You have done correctly ending the cbu at the flange and your tile will jump the gap well without problem. The best approach when installing cement board or other tile backer around a tub is to keep the cement board out of the lip area. You also don't want a 'water sandwich' i.e. Do not just cut a strip near your tub. • Keep sheet edges 1/8 in back from walls and cabinet bases. The first thing to consider is the wall. Then apply the tile backer on the boards and use a notched trowel over it to create a smooth … If it were my bathroom, I'd be installing a waterproofing membrane like Kerdi on top of the cement board. For the 2” gap that runs the depth of the tub, should I use cement board … Step 5. We used it on all three tub or shower surrounds. Forgot to mention that we had done that. That would have deflected any moisture droplets down and into the shower pan later on. Once all the boards are nailed to the surface, fill … In wet areas like the showers never place it on drywall. It is not meant to be in constant direct contact with water but is suitable for outside locations where exposure to water is likely. Most concrete backer-boards on the market today are not water-resistant, but all are waterproof. What are the names of Santa's 12 reindeers? The cement board must be properly backed at tub edge to keep it stiff. 9. Install the Remaining Sheets. This joint needs to be flush … Advice needed - Tiling tub surround, but there is a gap between cement board and tub that's too large to caulk. Retiling a tub surround is a common remodeling project because tubs have a track record for quitting early ... A row of blocking between the studs acts as backing for the cement board and to makes a base for flashing the tub into the wall. above the tub. In fact, you can use a drywall utility knife to score backer board, but a better option is a carbide-tipped scoring tool. Then apply a generous amount of thin-set to the bottom bathtub tile and position it 1/8 in. It would extend to the top edge of the tub covering that gap. As this cement board is installed, I feel it is a good idea to pay attention to where the material contacts the tub or shower and where it touches up against another piece of cement board. Position the backer rod slightly behind the surface of the tiles. Oh shoot - didn't realize this thread was so old before I posted. Hope things worked out. Did you get the tile on? Remodeling a bathroom often requires cement backer board be installed as a substrate for tile or another wall covering in a tub surround or other area that is exposed to large amounts of moisture. silicone). The cement board should be installed over the tile flange of the tub leaving a 1/16″ gap between the rim of the tub and the cement board. Mix up and apply a modified thinset to a large enough area of the plywood subfloor to cover each piece of backer board using a 1/4″ x 1/4″ notched trowel. Instead, remove the existing surface and place the cement on the studs and membrane. Cement board is heavy enough and breathable enough to take the moisture without a problem. Hall bath reveal: aqua with a bit of bling. Considering this, how big of a gap can I fill with caulk? DH says the cement board should come over the flange, without touching the tub rim/ledge itself (maybe 1/4" space). Technically, after the tile is installed over the backer board that gap between it and the tub ledge should be filled with an ASTM C920 sealant (caulking e.g. Add the vapor barrier. The heads are larger than deck screws or drywall screws, too. There should be a 1/4" gap between the tub ledge and the backer board. By continuing to browse this site or use this app, I agree the Houzz group may use cookies and similar technologies to improve its products and services, serve me relevant content and to personalise my experience. Concrete backer-board, once commonly referred to in the field by the brand name Wonderboard(r), is a cement product designed as a sheathing material for walls and floors. Shimming it out is probably only feasible if the tub has a really skinny flange like a … Then install the tile over the tub lip to 1/8" above the horizontal surface of the tub. Drywall or cement board in gap between bathtub and corner. If there's a gap at the bottom of the door, install a steel or aluminum threshold at the bottom, along with a door sweep on the lower edge of the door. It states no more than an 1/8" gap between the cement board and flange, and then says to seal the gap with caulk. Apply one bead directly along the edge of the tub and the second bead along the edge of the wall. DH says the cement board should come over the flange, without touching the tub rim/ledge itself (maybe 1/4" space). Put some clear silicone in the gap and then tile as normal. Cutting To cut D UROCK Brand Cement Board,mark desired size on the board with a rule and pencil. Step 3 - Caulk The mortar will also prefill the areas between the joints. Install the first full sheet of cement board lengthwise against the back wall (long … Then after all backer board is up smooth out joints with mastic or equivalent and caulk the gap between the bottom edge of the backer board and the top of the tub with good silicone caulk. He suggested filling in the gap with a strip of hardi-backer (easier to work with than cement board)--~3/4 wide. The tub will move/flex/expand/contract. You don't need any cement board under the tub. I don't tape corners. 2 | Determine layout of HardieBacker cement board • Stagger all HardieBacker cement board joints. Flooring repairs can be intimidating, but the subfloor under the tub generally consists of plywood secured over floor joists and is fairly simple to replace -- once you get access to it. In this video, I show you how to tape cement board joints. This version of Great Stuff expanding foam also offers water resistance. In either case, some say to fill the gap between the lip of the tub and the cement board or … Keep the cement board above the tub surface 1/2" or so. For the thinset step, you should look up the instructions for whichever backer board that you are using. He also suggested "spackling" the joint(s) with thinset, not joint compound. 1. It is NOT water proof - it will hold up better than drywall when wet, but not forever or for the long term. What does it mean when your invisible fence beeps? Leave a 1/4″ gap between the backer board and walls and 1/16” gap between the sheets of backer board. The gap between it and the tub is grout filled. Can you put cement board over drywall? Simply fill the spaces with the appropriate backer rod as needed. The simplest way to cut cement backer board is to score the surface and snap the sheet along the scored line, similar to the way you'd cut drywall. Grout goes everywhere except along the bottom edge of the tile where it meets the tub - there you put silicone caulking to allow for the movement of the tub without cracking the grout. Tiled in shower to tub conversion. He suggested filling in the gap with a strip of hardi-backer (easier to work with than cement board)--~3/4 wide. Use weatherstripping to keep bugs from getting in around the sides and top of the frame. If the cement board comes down over the flange, it'll end up bowing out. Hydroban is great. Tile then gets installed all the way to the edge of the tub. This small gap is created by the compressed thickness of the organic mastic or the cement thinset used to attach the tile to the backer board. 2. Cement Board Detail above the lip of the tub.
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