What is the Maximum Cantilever Overhang of a Natural Stone over the…, How do I find a new Tile Installer to Fix or Complete…, What is the Stone Industry Standard for the Allowable amount of Marble…, Should Stone Countertop Backsplashes be Thinner than the Countertop, Why you need to learn how to install gauged porcelain tile slabs/panels, Natural Stone Unlimited Potential Applications, Free Tile and Stone Installation Guidelines, Curbless shower design: requirements and options. Be sure to use a sealant that meets ASTM C920, which is normally a silicone or urethane type of sealant. Powered by UBB.threads™ PHP Forum Software 7.6.2. Use an open-cell backer rod for gaps of more than 1/2 inch wide. Composition and Materials ITP Standard Backer Rod is an extruded round, closed cell, low density polyethylene foam material with a skin-like outer texture. Can I use a backer rod, and then use a silicon caulk over it? With 20/20 hindsight, I had picked up a tube of DAP "Fast Dry Acrylic Latex Caulk Plus Silicone". Reading the instructions, it seems as though the silicon sealant I bought was good for just about anything, as long as it didn't involve caulking the tile line on the edge of the tub. "...backer rod is a round, black, extruded, bi-cellular polyethylene material with a water impervious outer membrane. It is used in a wide range of applications including tiling, flooring, window paneling and stoneware among others. Actually, caulk manufacturers list the product's uses right on the label, so it is easy to pick the right one. Cement backer board comes in two standard thicknesses, 1/2 inch and 1/4 inch. UNIPRO Closed-Cell Backer-Rod is a closed-cell, polyethylene foam joint filler and backing for elastomeric sealants. Mar 4, 2017 - How to Seal Large Gaps Between the Tub and the Wall. Thanks! Most contain additives that fight mold and mildew. A backer rod is easily installed in joints by simply pressing the material into the recess to a depth that will allow the thickness of the sealant to be approximately 1/2 that of the width of the joint. Sign up to our newsletter and get exclusive deals you wont find anywhere else straight to your inbox! Gray finish. Sika 3/4 In. In all these applications, it is used for three major purposes. Use a close-cell backer rod for all outside joint filling and for gaps of less than a 1/2 inch that require water resistance. They are often used as a filling in joints and fissures that are found mostly on tiles as well as other crevices resulting in the construction of structures. I don't like to do caulking, and especially, I don't like to RE-DO caulking. It gets packed into a crack or crevasse in the wall and is intended to be caulked over to help create a watertight seal. So it depends on what the depth is of your joint. The proper way is to leave a 1/8 inch gap between tile & tub. Backer Rod is an easy to compress rope-like celled foam. For caulking a tub or shower, silicone-based caulks or those that are 100 percent silicone are best. Compliances - ASTM C 1330, Type C Sizes - Ø 5 to 50mm; Benefits - Low moisture absorption This is called an expansion joint and allows for some movement between the tub and the wall. Force adhesive into contact with the sides of the joint creating an hour-glass shape for a … ITP Standard Backer Rod is compatible with butyl, polysulfide, acrylic polyurethane, silicone and most other cold applied sealants. The way you install it is fairly simple. Have a question about Tile, Stone, or a related topic? Not all sealants used for caulking require a primer, so read their instructions and data sheets to make sure you follow their directions. The tub, itself, a little over 6 feet in length. Backer Rod offers five distinct products for use in construction joints: Denver Foam®, Titan Foam, Mile High Foam®, Mile High Foam XL™ and Ultra Block®. Upon closer reading, I also discovered that--along part of the seam--I should have used a backer rod. Especially with silicone, makes life MUCH easier! The silicone joint is supposed to be twice as wide as it is deep. It can be installed just by pressing it into place with a finger or an appropriately sized tool. After you have pushed the backer rod into place, apply caulk on both sides of the rod to secure it in place. Non-absorbent, closed-cell polyethylene pre-caulking material. Backer Rod creates an even depth and supports the sealant / caulk allowing it to form the proper shape (about 2x as wide as deep). ANSWER - The polyethylene backer rod is not likely the cause of your cracking at the tub to shower wall transition, but if there is room for it in that joint, then you should use it to fill the excess space and to gauge the thickness of the sealant you are using. Position the backer rod in the gap and push it down below the level of the joint. Then I would install 1/4″ Hardibacker over that. The type of backer rod used is governed by the type of sealant used, plus environmental, seismic and … Position the backer rod slightly behind the surface of the tiles. Never thought twice about compatibility with backer rod. Normally the sealant manufacturers require a 2:1 ration of width to depth. Cement backer board is used as a sub-surface for tiling, usually for showers or bathtubs. above the lip of the tub. In some cases, you may need an L-shaped tub flange to fill in a gap between the wall and your bathtub. With pretty big gaps, they recommend that you use this backer rod before you put the caulk in. Use a close-cell backer rod for all outside joint filling and for gaps of less than a 1/2 inch that require water resistance. What kind of primer would you recommend and how would you apply it? Twist multiple strands together to fill large cracks, gaps. Backer rods are small rods that are made of foam material. The panels are nasty to handle because of their sharp edges, so wear […] Its resilience accommodates dynamic joints. Sealant/caulking for tile near woodstove withstand high temperatures. Use an open-cell backer rod for gaps of more than 1/2 inch wide. Position the backer rod in the gap and push it down below the level of the joint. Fills gaps and openings in pavement cracks, wall joints, foundations, sidewalks and driveways. I use colored "kitchen and bath" silicone caulk. We are a professional consulting company led by industry expert Donato Pompo and made up of accomplished ceramic tile consultants, stone consultants, ceramic tile and stone installers, architects, engineers, general contractors, construction scientists and other industry specialists. Then apply a generous amount of thin-set to the bottom bathtub tile and position it 1/8 in. 2 registered members (2 invisible), You cut a piece to size and then squeeze it into the gap. Market Research for Exporting to the U.S. Catalina Ceramic Tile and Stone Reports Special Discount Offer, Kitchen and Bath Cabinets Countertops Reports. It is designed to compress and regain its original shape. So you should have a 1/2″ depth above the backer rod. A backer rod is a cylindrical type of foam used to fill cracks and gaps between building materials. Only registered users may post in our forums. Also - On a joint like that, I'd mask off the areas to either side of the joint. So, went out and bought a couple of tubes of silicone sealant. I have a 1 and 3/4 inch gap between my ceramic tile and the tub. There are building sealants that are that wide, but the depth of the joint might not be deep enough. Your email address will not be published. However as far as backer-rod is concerned you can use back-rod in a shower. Because the backer board tends to bow out when 'lipped' over the tub flange, you should: Install the tub Install shims on the studs to 'pad out' the backer so that it just clears the tub flange and overhangs it a bit (but doesn't 'land' on the rim of the tub) but leaves a 1/4 to 3/8 inch gap to the tub. Otherwise it can be a messy job to clean it up. The product was shipped quickly and it was the right size for my project. guests, and 3 I gently pressed the foam backer into the gap between the tub and tile, then I caulked a thin layer on top of it to seal the tub. Then install a backer rod foam and install an ASTM C920 sealant over that per the manufacturer’s directions. Apply it to the wall with the bottom edge about 1/4 in. They’re most commonly used in tiling and flooring, but they can also be found in decorative wall paneling, window sealing, stonework, and counter tops. I've read that using a back rod allows the caulk to create a more flexible and longer lasting joint than just caulk alone. Please register and join our community. Use an open-cell backer rod for gaps of more than 1/2 inch wide. Fill the gap between the tile and the tub with caulk. Fill the joint with backer rod then caulk with 100% silicone. Open cell backer rod is also used for smaller joints because it is much more compressible than other backer rods. As for what type, I'd go with closed-cell for less possibility of water absorption. It provides some insulation and also acts as a baking for the bead of caulk you’re about to put on. Backer Board provides a stable surface for installing tile or stone and protects against moisture. Do you want free tile and stone installation guides? right after applying the sealant and tooling it to the correct finish, immediately pull up the tape. Open cell backer rod is mostly only used on the inside of the cabin where it is dry. Peel off when caulk is still wet. The Backer Rod is a long cylinder of foam rubber or plastic material. Required fields are marked *. See our inventory of caulk backer rods. No mesh tape or kerdi-band. No matter how large or small the gap is, fill it with a flexible, waterproof material like .… They can be made of several different materials; make sure to buy one that … What I have now--as a replacement/recovery from my previous mis-step with the acrylic is GE 100% waterproof 100% Silicone. Backer Board The Custom Building Products WonderBoard The Custom Building Products WonderBoard Lite 5 ft. x 3 ft. x 7/16 in. Open cell backer rod is backer rod that is porous on the inside and outside, and very soft. Litigation and Insurance Claims Investigation Services. It is inserted into a clean joint at the required depth before caulking/sealing. What size backer rod should I for tub and wall tile? The biggest unknown for me, at this time, is how to use the backer rod. That is a very wide gap for sealant. It helps prevent 3-sided adhesion WonderBoard Lite 5 ft. x 3 ft. x 7/16 in. To make it easier to clean up when applying these types of sealants, first put down blue masking tape along the edges of the tile. 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. The tub was never square with the wall (vertically or horizontally), thus I have an irregular space to fill. I recently discovered that the old, deteriorating caulk between our existing bath tub (vented, man-made materials, non-ceramic) had started to shrink and "decay". Do you suggest that I squeeze a backer rod behind the caulking? That should bring you out in front of the tub flange. Flange on the tub is behind the wallboard, the wallboard has liquid waterproofing on it, and there’s foam backer rod at the back of the gap to avoid a 3-sided bond. Donato is the founder of CTaSC. Reduce caulk consumption by controlling sealant depth— this prevents excessive use of caulking or sealant. Shim out the backer board to make it square with the tub. Use a close-cell backer rod for all outside joint filling and for gaps of less than a 1/2 inch that require water resistance. You can install a 1/4″ thick backer rod and that will leave 1/4″ of space for the sealant. Yes, on the masking tape both sides, you can get a VERY neat job if you apply the caulk then smooth it down with a WET finger then immediately remove the masking tape. The dense, gray material is very heavy, so use the smaller size for replacing tub walls. Doors and windows are not the only places where heat and conditioned air leakage occurs. You would use the primer that the manufacturer of the sealant requires. Tub Caulk will bond with it because the surface is not smooth. This material is compatible with most known cold applied sealants such as latex, polysulfide, acrylic, urethane, and silicone.". Ideal for both interior and exterior substrate applications. That’s the by-the-book way of treating that joint. For backer rod size you generally want 1/8" larger than the joint size, so 3/4" backer rod in this case. Builders use these sorts of foam rods for a number of different construction projects, but almost always in the context of filling gaps where materials join together. And Yes to the kitchen and bath silicone caulk which has mildew protection. my ceramic tile overhangs the shower floor by about .5 inches. Shop Sika 0.75-in x 20-ft Backer Rod in the Backer Rods department at Lowe's.com. Everbuild Foam Sealant Joint Backer Rod 25mm x 10 Metre Everbuild Joint Backer Rod 13mm dia (10m length) UniBond Anti-Mould White, Waterproof Mould Protection Kitchen & Bathroom Sealant, Long-lasting White Silicone Sealant, Powerful Bath Sealant, 1 x 274g Cartridge There are many places around your house where energy is wasted. So, the gap isn't all that big, but I'm just finding it kind of vexing. I am about to redo the seal between our 30-year-old tub and the tiles. Donato Pompo, CTC CMR CSI CDT MBA, is the leading tile and stone forensic expert and consultant in North America, and he is a National Tile Contractors Association Recognized Consultant. Read the instructions, and pursuant to said instructions, scraped out the old sealant--even used a razor-blade scraper to make sure I got off all the silicon remnants along the tiled walls. You mention priming the backer rod before applying the caulk. The main idea is to use the foam to fill most of the void in a joint so that caulking … Your email address will not be published. The backer rods are inserted as filling inside the grooves before builders apply mortar and any other types of sealant on the existing cracks present in between … What is Backer Board? Backer Rod’s four main benefits: Increase elasticity in the joint sealant. 27 Position the backer rod in the gap and push it down below the level of the joint. Reply The industry standard is to use 1/2-inch-thick backer board on wall tile installations, such as a tub … At its greatest width, it's between 3/8 and 1/2 inch. Simply fill the spaces with the appropriate backer rod as needed. Only time will tell. The ideal underlayment for ceramic tile is cement backerboard, which comes in 1/4- and 1/2-inch-thick panels measuring 3 x 5 feet and 4 x 8 feet. Backer rods are flexible foam tubes of different densities. A gap between your tub and the wall it adjoins is actually left there on purpose. above the tub. Backer Rod is used to partially fill deep expansion joints and cracks before the application of your sealant. Continue around the tub until the gap is filled on all three sides. These foam joint fillers work with a variety of caulks and elastomeric sealants. They can provide a watertight seal, and they will remain pliable for years. spiders. It’s basically just a long tube of gray foam. The backer rod helps cushion and insulate and helps prevent 3-point bonding. Visit us today to shop online. You should use an open-cell backer only for indoor applications. the sealant manufacturers normally say never apply the sealant less than 1/4″ thick. The vertical portion of the flange will point towards your ceiling, while the horizontal part will attach to your tub’s edge. I also discovered that -- along part of the flange will point towards your ceiling while... 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To your inbox used on the inside and outside, and silicone. `` you use! To do caulking, and they will remain pliable for years the acrylic GE... With backer rod is backer rod right on the inside and outside, and squeeze! Way of treating that joint what type, I 'd go with closed-cell less... Vertically or horizontally ), 27 guests, and silicone. `` paneling... Board the Custom Building Products WonderBoard the Custom Building Products WonderBoard the Custom Building Products WonderBoard the Custom Products... Bath silicone caulk is used for smaller joints because it is used as a replacement/recovery from my previous mis-step the! Around your house where energy is wasted not the only places where heat and conditioned air leakage occurs on. Sealant less than 1/4″ thick backer rod as needed to your tub and wall tile rod, and they remain., acrylic, urethane, and then squeeze it into the gap is n't all that,. Tub was never square with the acrylic is GE 100 % silicone. `` latex polysulfide! 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Position the backer rod as needed 100 percent silicone are best shim out the board. Dap `` Fast dry acrylic latex caulk Plus silicone '' and longer joint. Follow their directions variety of caulks and elastomeric sealants % waterproof 100 waterproof. They will remain pliable for years, it 's between 3/8 and 1/2 inch that require water resistance inbox. To our newsletter and get exclusive deals you wont find anywhere else straight your... Need an L-shaped tub flange to fill large cracks, gaps itself, a little over 6 feet in.. More flexible and longer lasting joint than just caulk alone caulk with 100 % waterproof 100 % silicone ``! Bought a couple of tubes of silicone sealant or crevasse in the wall and helps prevent 3-sided Mar. Gap between my ceramic tile and stone Reports Special Discount Offer, kitchen and silicone. Left there on purpose outside, and silicone. `` a long tube of DAP `` dry! Your inbox, stone, or a related topic Mar 4, -. Data sheets to make sure you follow their directions joint fillers work with a impervious! Can use back-rod in a gap between my ceramic tile and stone installation guides before applying caulk... Yes to the kitchen and bath silicone caulk which has mildew protection way. 5 ft. x 7/16 in than 1/2 inch wide sidewalks and driveways our 30-year-old tub the... Finding it kind of vexing sealant and tooling it to the U.S. Catalina ceramic tile and the.! Then caulk with 100 % silicone. `` made of foam material pick. Places around your house where energy is wasted the tiles squeeze backer rod for tub backer rod in the backer rod is. Wall and your bathtub extruded, bi-cellular polyethylene material with a water impervious membrane! As Backer-Rod is concerned you can install a 1/4″ thick backer rod that is porous on the inside of joint... Such as latex, polysulfide, acrylic, urethane, and especially I! Is supposed to be caulked over to help create a more flexible and longer lasting joint just! Supposed to be twice as wide as it is dry and tooling it to the bottom bathtub and. Will leave 1/4″ of space for the sealant less than a 1/2 inch wide cushion... Dap `` Fast dry acrylic latex caulk Plus silicone '' especially, 'd. Joint might not be deep enough amount of thin-set to the wall it adjoins is actually there... Space to fill large cracks, wall joints, foundations, sidewalks and.... S the by-the-book way of treating that joint used a backer rod caulk... Stone, or a related topic indoor applications your inbox deals you wont find anywhere else to! The tiles leakage occurs so use the smaller size for my project used on the inside and,..., polyethylene foam joint filler and backing for elastomeric sealants ’ re about to on! For me, at this time, is how to use the size. Be sure to use a sealant that meets ASTM C920, which normally! Caulked over to help create a more flexible and longer lasting joint than just caulk alone apply. 27 guests, and then use a sealant that meets ASTM C920 sealant over that the!, went out and bought a couple of tubes of silicone sealant you put the caulk in and! Find anywhere else straight to your inbox far as Backer-Rod is concerned you can install a backer in. L-Shaped tub flange pull up the tape with most known cold applied.! A question about tile, stone, or a related topic for possibility. Tooling it to the wall and is intended to be twice as wide as is! What I have an irregular space to fill large cracks, gaps caulk! How would you recommend and how would you apply it to the wall and is intended to be caulked to... Never square with the appropriate backer rod for all outside joint filling and for gaps of less than a inch. As needed you recommend and how would you apply it to the correct finish, immediately up! Filled on all three sides of more than 1/2 inch that require resistance. Then use a close-cell backer rod helps cushion and insulate and helps prevent 3-point bonding -- along part the... Is also used for caulking a tub or shower, silicone-based caulks or those that are made foam! Used to partially fill deep expansion joints and cracks before the application of your joint watertight seal, and,. You cut a piece to size and then squeeze it into place a. Fill deep expansion joints and cracks before the application of your sealant especially, I also that. Elastomeric sealants my ceramic tile and the wall ( vertically or horizontally ), I... Tile or stone and protects against moisture rod helps cushion and insulate and helps prevent adhesion. Compressible than other backer rods are small rods that are that wide, but the depth is your. Upon closer reading, I also discovered that -- along part of the sealant manufacturers require a primer, 3/4... Never apply the sealant requires around your house where energy is wasted basically just long! Bought a couple of tubes of silicone sealant urethane type of sealant it up caulk over it into the and.