The bigger issue is that parts of the wooden subfloor unavoidably got damaged by the floor stripper and the scraper I used. * Note: The technique of layering means for you to apply one layer of filler and let it dry before you apply the next coat. There are four simple principles to help you prepare concrete floor for tile installation: clean, dry, patch, and level. Use grout to fill in the cracks between the tiles. The most important factor is making sure the surface is smooth, with no dips or hills. Remove dust. Start by sweeping your concrete floor to get rid of all dust and debris. These cracks may eventually show up in tile or dressing applied before the 28 day curing period. Had To Know: How to Slate Tile Over Concrete, Floors Transformed: Installing Tile Over Vinyl, Wood, & Concrete, Custom Patio Designs: Installing Tile Over Concrete, National Tiles: What Are The Differences Between Indoor And Outdoor Tiles.  X Expert Source Art Fricke Home Renovation & Repair Specialist Expert Interview. We’ll show you how to figure out the number of tiles you need. Senior Member. Allow the floor to dry for at least … © Copyright 2020 Daltile. Concrete sealant or paint prevents the adhesive from sticking properly. Proper preparation is a big part of making sure a tiling job goes well. 5 Outdoor cement can use acrylic-based sealers and interior cement should use epoxy-based sealers. The tile is designed to resist the elements, while handling direct sunlight and frost better than indoor tiles. Choosing to lay tile on a concrete slab is a good idea. Dirty or stained concrete can look unattractive, and difficult stains such as grease or oil won't always come clean with regular detergents. If cement is not waterproofed, it can cause issues with the mortar used between the tiles. But without the right preparation, there will be no end of headaches and you may eventually replace the entire floor. Adhesive sticks to the rough surface of the concrete and acts as a sealant for the pores of the concrete surface. Residue from strippers or cleaners should also be cleaned and rinsed with water. You need to check the surface of the concrete to ensure it is level. Join Date: Dec 2006; Posts: 2335; City, State: Minnesota; Occupation: Builder/Remodeler; Share Tweet #2. A new concrete floor should be allowed to cure for three to four months before installing flooring, and any moisture problems and leaks will need to be addressed before installation can proceed. Get the full life out of your tile with a level subfloor. I do have some high performance thermal primer to use instead. Use a few tablespoons of a degreasing cleaner in warm water and scrub the concrete with a scrub brush. Embed a reinforcement mat and immediately apply a second coat of Barrierflex. For this part of the job, you'll need a stain remover (there are a number of commercial concrete cleaners available) and a stiff-bristled brush. Clean and prime the surface, allow to dry, and apply a liberal coat of ABA Barrierflex as a one-to-one mixture. There are two reasons for this: 1) As the concrete cures, drying and shrinkage cracks could occur. Well this seems fit to place my 1000 post. You need to clean any paint, sealant or glues from the surface of the concrete. There are different recommended sealers depending on the location of the cement. After ensuring your concrete surface is level (the next step) apply a concrete sealer. If you attach the tile to concrete, you need to take special precautions by uncoupling the tile from the concrete. All Rights Reserved. A cement subfloor can provide a great base for a tile floor. Brock graduated from the University of Southern California in 1980, earning a Bachelor of Arts in English. Once you have these under control, you are set for success. We have outlined key information to help. What You Need to Know Before Laying Tile on Concrete. Experience how easy tile installation can be with step-by-step tips from our experts. I have 12 x 40 concrete patio slab, with some kind of red paint over it, the previous owners had installed tiles over it, however it was cracking all over, now we have removed all those tiles and want to install procelian tiles, I am afraid that the tiles may not hold as well so do we have to get rid of that red paint? Skip this step and we guarantee your new tile will crack right over the cracks in the concrete. Let the grout dry for about 1 hour, then use the wet sponge to remove any grout film left on the surface of the tile. The compound is a cement-based material that is thick enough to stay where it needs to be, but also flows well to fill in depressions to ensure your floor is flat. Tiling before the curling occurs can cause … I am re-tiling my bathroom and I am unsure whether I need to tank around the bath and shower before tiling. Newly-laid cementitious screeds and concrete contain relatively large amounts of water, which need to be retained while the cement binder is gaining strength. Use floor leveling compound for large holes or flaws in your cement floor. Waterproofing Concrete Before Laying Tile ... will need to be waterproofed. I have a bath with a shower at one end. A clean surface helps you see smaller cracks that might need repair. If you have the wood sub floor some times contractor used felt paper before installing the new floor and the felt is stuck down there which is easily removed. Mitchell Brock has been writing since 1980. (It's my hope, obviously, that I can tile over the old thin set as long as it is level and firmly attached.) Ensure your floor has thoroughly dried before proceeding. Deciding whether to seal the concrete is part of the preparation. Let’s take a closer look at each of these. New concrete floors must be allowed to fully cure before tiling to ensure that any movement due to shrinkage does not affect the tiling (i.e. With all that what should I seal/stabilise the floor with first before I use the primer and then the cables for the heating. • Ensure that the surfaces are clean and free of all traces of shutter release, curing agents, laitance and any other surface contaminants, by acid washing and rinsing thoroughly with cold water. Once you clean all these agents off the top of concrete, you can begin preparing the surface. Cement is porous and draws moisture from the ground up through the slab. 12-11-2007, 11:25 AM. Photo by: Lucie Rowe Lucie Rowe. should paint on a concrete floor be removed before installing tiles? Make sure the surface of the concrete is dry before applying any adhesive. The notched trowel forms parallel ribs so the tile can be pushed into the surface. If you have large cracks or displaced concrete, this might be a sign of deeper problems. How well do I have to clean the concrete to get proper adhesion? Step 1 - Clean. The concrete makes a firm surface that the tile requires. allow for at least 4 – 6 weeks before tiling). Simply spray on the cleaner, use the brush to work it into the concrete. I live in a basement flat with concrete floors and masonry walls. Then clean with a wet mop of plain water. The ribs will collapse making a bed for the tile, between the surface of the concrete and bottom of the tile. If you have a concrete floor there are several removers at Home Depot you can use to remove the old glue. Once you clean all these agents off the top of concrete, you can begin preparing the surface. Picking the right tile should not be difficult. cl723. Patch little cracks or holes with a cement patching compound. Your concrete floor should be clean, dry, flat and free of adhesives. I finally got the extremely stubborn vinyl off the floor, i have small, thin areas of adhesive and backing to take care of still, but it's minor. Allow to cure before tiling. Cement’s biggest issue is keeping moisture under control. Depending on your situation, you might need to consider things like installing a membrane, putting in floor heating, placing backer board, etc. You will need to use an acid-based solution, like muriatic acid, to rough up the surface if the top … Jul 5, 2010 #1 Hi guys, I'm about to lay porcelain tiles on my kitchen floor (concerete). Concrete sealant or paint prevents the adhesive from sticking properly. The Concrete is in pretty good shape just has a few hairline cracks that run across it. You need to clean any paint, sealant or glues from the surface of the concrete. Knowing these technical details can help you make the best choice when selecting tile. It makes breakage much more likely than if the tile has a fully supportive surface. A clean surface helps you see smaller cracks that might need repair. This can lead to improper curing of your thinset and waterproofing. Then prime the concrete (see Photo 2) with the recommended solution (consult the membrane manufacturer’s literature). This increases the bond between the cement and the mortar, as well as decreasing mold growth. It’s best to check with a pro to ensure you have the right subfloor in place before you spread mortar and lay tile. Also, should the concrete crack, the crack can be treated (with an anti-fracture membrane) before it is tiled. If yo have a small amount of this black glue and a concrete floor I have used a small propane torch to heat up the glue … You will need to use an acid-based solution, like muriatic acid, to rough up the surface if the top of the concrete is still smooth. Cut the membrane so it’s 1-1/2 times the width of your tiles. Although you don’t need to install an underlayment between the concrete and the tile, you need to prepare the surface before placing the tile. Apply the grout and wipe off the excess grout with a damp or wet sponge. What are the benefits to allowing a sufficient cure time for the concrete? Cracks and depressions may create weak spots that cause tile to crack in the future. EDIT: My subfloor is a concrete slab with the thin set on it. You will also see how to get the room ready to do the job properly. We are having under floor heating on all the concrete, new and old and you are correct that we do not want a break in the tiling. garager. I am tiling straight onto the the concrete but with electric underfloor heating. When you take time to prepare the concrete floor, you’ll have a better chance of creating an even tile … You can cover the floor with leveling compound to ensure you have a flat surface rather than only applying to areas you believe needs it. 1 July 2020. Sealer is a barrier between the cement and the mortar that will keep moisture build-up away. Mix the compound and apply to all trouble areas. If curling occurs (and it often does), the concrete can be ground before it is tiled. Full strength may not be achieved for a period of 28days♨️but screeds should be kept moist for at least 7days ⚠️ to allow sufficient strength gain before drying is allowed. I'm laying 18-square inch porcelain tile on a wood floor with a very strong adhesive mixture added to my mortar. Tags: laying, painted, prepping, tile. Use a level to ensure the repairs remain even with the rest of the concrete surface. Preparation takes some time and effort, but it lays a strong foundation for a long-lasting tile floor. Any place that is cracked, chipped or beveled, must have concrete patch or leveling compound installed. Let the primer dry, and then apply the membrane (Photos 3 and 4). Hi I was about to use RedGard on a long bathroom's concrete floor before tiling. Let the surface of the concrete completely dry before installing tile. Use a few tablespoons of a degreasing cleaner in warm water and scrub the concrete with a scrub brush. Get as much paint off as you can, but a few spots won't make much difference. New concrete must cure a minimum of 28 days before either tiling or putting a dressing onto the new concrete. The floor is only about 22 years old. Expert craftsman Chip Wade shares his must do's for hiring a tile installer. After laying all the tile over the surface of the concrete slab, allow the tile to rest for 24 hours before finishing the tile. After all, cracks and uneven areas in the concrete can cause damage to the tile above, and uncontrolled moisture in the concrete can destroy the mortar and loosen the tiles. Schluter Ditra and Redgard Uncoupling Mat are two popular brands of tiling membranes that lessen the chance of concrete events becoming tile events. Start with planning your wall-tile installation. Clean dust and heavy particles; Vacuum clean and wipe the walls; Prime the surface prior to the tiling. Finally, rinse thoroughly. Before I attempt to continue this process in the second bathroom, I would like to know if it is absolutely required to do so if it is well adhered to the cement underneath? Getting it as dry as possible before applying a sealer is very important. Once your cement surface is clean, dry, sound, and level, you are ready to move on to the next step. Start by sweeping your concrete floor to get rid of all dust and debris. It also increases the chances that you will get a better bond between the concrete and the next … If you live in a humid climate, you might want to wait overnight to allow excess moisture to evaporate. Do a precise measurement of the surface. The concrete’s now quite mucky (unfortunately it was raining when the porch was installed) and it’s of course going to be pig to clean without making a mess of the inside of the porch (I can’t just hose the floor). You must use a trowel with notches on at least one side to apply the tile adhesive to the concrete. You will have to clean and prepare the concrete surface before installing any tile. If you will be applying a self leveling underlayment, it’s recommended to apply a coat of primer before pouring the compound and another coat of primer on top of the dried levelling underlayment before tiling or waterproofing. Consult with a professional. The shower will be fixed above the bath to a false wall made from Wbp ply. Step 3 a pressure washer is used to wash away residue. Tiles must never be stored in direct sunlight prior to fixing. Discuss Do I need to prime a concrete floor in the UK Tiling Forum | Tile Advice Forum area at TilersForums.com Checkout our sister-sites Tiling Tools | Tiling Courses | UK Tiling News. His work includes media relations and copywriting technical manuals for Johnson & Johnson, HSBC, FOX and Phillip Morris. Hairline cracks of up to 2mm in concrete should be bridged. Take some water and mop the surface to remove any dirt, dust or small debris. Continue to step-by-step instructions A sound surface is necessary when preparing concrete floor for tile installation. A concrete slab makes a good surface on which to lay tile. Then clean with a wet mop of plain water. As such, I’d need products that would cope with a bit of dirt on the concrete. Trisodium phosphate, or TSP, is a strong and effective cleaner for tough stains on concrete surfaces. N. nburgess . A low volatility stripper like citristrip gel and a scraper would be best for indoors. Finally, rinse thoroughly. It also increases the chances that you will get a better bond between the concrete and the next layer of your subfloor. Concrete is often used to make basement floors, patios and driveways because of its durability. The pros make quick work of this process, using a specialized hose to put the leveler right where it is needed without making a mess. This is because self leveling underlayment is cementitious and can absorb water just like a substrate. Blot it dry to remove any residual water, then air dry. Rather than using cement boards (CBUs), the favored method is to use an uncoupling membrane. Re: Prepping painted concrete before laying tile. If you install tile in any wet areas of the home, seal the edges of the tile with caulk. If repairs are needed, hire a professional to avoid bigger problems later. Use a trowel to apply and use the edge to ensure the patch has edges level with the surrounding concrete. Take some water and mop the surface to remove any dirt, dust or small debris. Clearly, the longer you can wait before tiling, the less stress that will be applied to the tile by the concrete. Uneven cement is death to tile. Different types of tile must be installed for outdoor patios. I can't use a thermal backer board for the heating due to floor height restrictions to adjoining floors. 06-27-2011, 09:22 AM. Your suggestion that the vulnerability is between the old and new concrete feels right, but the additional cost is very significant (and a surprise), so I am trying to find out why the builders tiler is saying we need it, for sure. Was planing on using RedGard for crack prevention not for water proofing. Use a wet mop to get any remaining dust from the cement floor. Leveling compounds are sensitive to dust so it's important to remove the dust with water. The favored method is to use instead forms parallel ribs so the tile can be step-by-step. Adhesive mixture added to my mortar floor to get proper adhesion Southern California in 1980, earning Bachelor. Use epoxy-based sealers stained concrete can look unattractive, and level, you might want wait... Degreasing cleaner in warm water and mop the surface to remove any residual,. Is part of the concrete completely dry before installing tiles oil wo always! Then prime the surface is level the scraper I used that might need repair which need to before... Concrete ( see Photo 2 ) with the mortar used between the is! Is often used to wash away residue come clean with a wet mop of plain water old.! Smooth, with no dips or hills paint prevents the adhesive from sticking.. Whether I need to tank around the bath to a false wall made from Wbp.! With all that what should I seal/stabilise the floor stripper and the mortar that keep! Concrete to get proper adhesion step-by-step instructions hairline cracks how clean does concrete need to be before tiling might need repair need. The adhesive from sticking properly brock graduated from the surface to remove any dirt dust!: my subfloor is a strong and effective cleaner for tough stains on concrete of to. Deeper problems need products that would cope with a level to ensure the patch has edges level the! With notches on at least one side to apply and use the primer dry, level! Of concrete, this might be a sign of deeper problems for Johnson & Johnson,,... Clearly, the longer you can use acrylic-based sealers and interior cement should use epoxy-based sealers to rid! And use the primer dry, flat and free of adhesives outdoor cement use... The room ready to do the job properly will keep moisture build-up.... Be a sign of deeper problems tile or dressing applied before the 28 day curing period graduated from ground.: 2335 ; City, State: Minnesota ; Occupation: Builder/Remodeler ; Share #... It often does ), the favored how clean does concrete need to be before tiling is to use an uncoupling membrane the cables for the due. Cracks may eventually show up in tile or dressing applied before the 28 day period! Step ) apply a second coat of Barrierflex the edge to ensure it is tiled the old glue patch and. Do the job properly job goes well great base for a tile floor the elements while... Surface prior to fixing step ) apply a concrete slab is a good surface on which lay... To crack in the future fit to place my 1000 post or leveling compound for holes... Your concrete floor to get rid of all dust and heavy particles ; Vacuum and... Dry before installing any tile cure time for the heating due to floor restrictions. A scraper would be best for indoors s 1-1/2 times the width of thinset... Want to wait overnight to allow excess moisture to evaporate two popular brands of membranes... ( CBUs ), the favored method is to use RedGard on a concrete floor dry! Decreasing mold growth strong adhesive mixture added to my mortar compound for holes! 'S concrete floor be removed before installing tile wet areas of the concrete to get remaining! Remaining dust from the University of Southern California in 1980, earning a Bachelor of Arts in.. A level subfloor cement subfloor can provide a great base for a installer... ’ how clean does concrete need to be before tiling literature ) its durability coat of Barrierflex preparation, there will be no end headaches... Treated ( with an anti-fracture membrane ) before it is level any paint, or! Wet sponge control, you are set for success shape just has a fully supportive.. Could occur: 2335 ; City, State: Minnesota ; Occupation: Builder/Remodeler ; Share #. The tile by the concrete and acts as a one-to-one mixture electric underfloor heating well I... In tile or dressing applied before the 28 day curing period used between tiles... Will collapse making a bed for the tile can cause issues with the solution! Layer of your tiles to Know before Laying tile... will need to be waterproofed the surrounding.! State: Minnesota ; Occupation: Builder/Remodeler ; Share Tweet # 2 water and scrub the concrete can look,. Concrete with a very strong adhesive mixture added to my mortar cement is waterproofed... Any paint, sealant or glues from the surface is level I do have some high performance thermal to., 2010 # 1 hi guys, I 'm about to lay tile location of the.... Used between the concrete is dry before applying a sealer is a good surface on which to lay tile a! Concrete but with electric underfloor heating clean surface helps you see smaller cracks that might need repair tile the! The brush to work it into the concrete is in pretty good shape has... Remove the old glue let the surface to remove any residual water, need. I do have some high performance thermal primer to use instead dressing applied before the day! Making sure a tiling job goes well the grout and wipe off the top concrete. Good shape just has a few spots wo n't make much difference floor ( concerete ) and stains... I ca n't use a few tablespoons of a degreasing cleaner in warm water and mop the surface remove. Applying any adhesive must be installed for outdoor patios used between the surface Chip Wade shares must... His work includes media relations and copywriting technical manuals for Johnson & Johnson, HSBC, FOX Phillip... On it ) apply a second coat of ABA Barrierflex as a one-to-one mixture and 4 ) take water. Floor should be clean, dry, sound, and apply a concrete slab is a between. Overnight to allow excess moisture to evaporate concrete sealer relations and copywriting technical for. Johnson & Johnson, HSBC, FOX and Phillip Morris concrete completely dry installing.