There's already cement board … 9. Do you need a vapor barrier behind cement board? Put some clear silicone in the gap and then tile as normal. 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. Why is sponge Labelled as a soft material? For the thinset step, you should look up the instructions for whichever backer board that you are using. That gap is supposed to be there to accommodate for expansion/contraction of the different materials. Then they install the bottom tile so … What does it mean when your invisible fence beeps? Waterproof the walls. 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. Position each piece of backer board in the thin-set, press in place, and attach using special backer board … Position the backer rod slightly behind the surface of the tiles. Measure the gap and cut a piece of the casing to size with a coping saw. 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. 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. Beside above, how much space should be between cement board and tub? 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. Instead, remove the existing surface and place the cement on the studs and membrane. This version of Great Stuff expanding foam also offers water resistance. ¿Cuáles son los 10 mandamientos de la Biblia Reina Valera 1960? Cement board should come down TO the flange, and then fill the gap with stiff thinset. The first thing to consider is the wall. I prefer to add screws to the top of the cement board then use a level to trace a vertical line indicating the stud position behind the cement panel. Step 5. 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. Continue installing sheets to cover the entire floor … 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. 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. You would have done better to have a 4 mil plastic vapor barrier on the wall extending out and over the tub flange. If the cement board comes down over the flange, it'll end up bowing out. In this video, I show you how to tape cement board joints. Measure the size of the gap that needs to be filled. There should be a 1/4" gap between the tub ledge and the backer board. Keep the cement board above the tub surface 1/2" or so. You can see in the photo that I even installed some around the plumbing fixtures where the cut left a gap. Rona, HD, HH will all have them. 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. Did you get the tile on? Cement board is heavy enough and breathable enough to take the moisture without a problem. You’ll want to tape where the cement board backer board meets the sheetrock wallboard. Fill gaps between 1/4 and 1/2 inch in width with two beads of caulk set side by side. At some point along the wall, the cement backer board will meet with the drywall used in the rest of the room. Cement Board Detail above the lip of the tub. West Yorkshire's Innovative & Fast Moving Architecture Firm. Allow slight gaps – approximately 1/8 inches – between cement boards to account for any expansion due to heat. I do tape bevels simply to make a flush surface for the tiles. silicone). 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. GW's resident tile guru's and GC's will probably provide further suggestions and advice as well. DH says the cement board should come over the flange, without touching the tub rim/ledge itself (maybe 1/4" space). So, I’ve about installed all the cement board for my bathroom tile renovation around the 3 sides of the tub. Apply thin sets made of cement over the tapes on the backer boards to fix the seams of the board correctly. Cutting To cut D UROCK Brand Cement Board,mark desired size on the board with a rule and pencil. Ideally, you would leave 1/8 inch gap which would then have sealant applied to it. DH says the cement board should come over the flange, without touching the tub rim/ledge itself (maybe 1/4" space). Typically, most any … Now, you can use either caulk or mesh tapes to close the gaps between the backer boards. Oh shoot - didn't realize this thread was so old before I posted. Attach a vapor barrier behind the cement board as an intervening moisture membrane. Hondagirl, how did your project turn out for you? Asked 3 weeks ago by britcharlie. Tile vs. tub surround? It is NOT water proof - it will hold up better than drywall when wet, but not forever or for the long term. Installing cement board at the beginning of your remodeling project is crucial when you want waterproof tile floors that will last for many years without cracking or other signs of damage. Most concrete backer-boards on the market today are not water-resistant, but all are waterproof. Hope things worked out. Staple 4-mil plastic sheeting to the … Install blocking for future grab bars while the walls are open. Don't worry about trying for a cosmetic fix with the caulk, just fill the void and let dry. 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. poly behind the cement board and then waterproofing on top of the cement board as this just completely traps any moisture in that envelope. Close. How Do You Fasten Backer Board To Walls? He suggested filling in the gap with a strip of hardi-backer (easier to work with than cement board)--~3/4 wide. Also know, should cement board go under tub? Continue around the tub until the gap is filled on all three sides. above the tub. Forgot to mention that we had done that. What is internal and external criticism of historical sources? In wet areas like the showers never place it on drywall. 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 fact, you can use a drywall utility knife to score backer board, but a better option is a carbide-tipped scoring tool. Step 3 - Caulk 2. The fasteners … above the lip of the tub. DH says the cement board should come over the flange, without touching the tub rim/ledge itself (maybe 1/4" space). The tub will move/flex/expand/contract. He suggested filling in the gap with a strip of hardi-backer (easier to work with than cement board)--~3/4 wide. You have done correctly ending the cbu at the flange and your tile will jump the gap well without problem. Then install the tile over the tub lip to 1/8" above the horizontal surface of the tub. There should be a 1/4" gap between the tub ledge and the backer board. Then, again usin your trowel, embed 2" alkali-resistant mesh tape into the mortar … Archived . What is the best way of dealing (waterproofing) with this space? So I've got to squish in lots of thinset, let it dry and sand it smooth? For my bath surround/shower, my GC put up cement board without the 6mm poly. I also try to create these same, or slightly smaller gaps … Tiled in shower to tub conversion. Not only cement board (hardi is fine) but you must go 3-4 feet up. 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. Leave a 1/4″ gap between the backer board and walls and 1/16” gap between the sheets of backer board. That would have deflected any moisture droplets down and into the shower pan later on. What are the names of Santa's 12 reindeers? 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. The heads are larger than deck screws or drywall screws, too. 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. The cement board must be properly backed at tub edge to keep it stiff. I'm planning to install 3x6 ceramic tile from floor to ceiling around my tub. Once all the boards are nailed to the surface, fill … above the tub. Learn more. By having the vapor barrier behind the cement board you stop the moisture going further into the wall. 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. 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.
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