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. Experience how easy tile installation can be with step-by-step tips from our experts. EDIT: My subfloor is a concrete slab with the thin set on it. Choosing to lay tile on a concrete slab is a good idea. Apply the grout and wipe off the excess grout with a damp or wet sponge. Finally, rinse thoroughly. A cement subfloor can provide a great base for a tile floor. 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. If you attach the tile to concrete, you need to take special precautions by uncoupling the tile from the concrete. 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. You need to check the surface of the concrete to ensure it is level. If you install tile in any wet areas of the home, seal the edges of the tile with caulk. 06-27-2011, 09:22 AM. Mix the compound and apply to all trouble areas. You will need to use an acid-based solution, like muriatic acid, to rough up the surface if the top … Let the primer dry, and then apply the membrane (Photos 3 and 4). Step 3 a pressure washer is used to wash away residue. It makes breakage much more likely than if the tile has a fully supportive surface. (It's my hope, obviously, that I can tile over the old thin set as long as it is level and firmly attached.) Schluter Ditra and Redgard Uncoupling Mat are two popular brands of tiling membranes that lessen the chance of concrete events becoming tile events. The floor is only about 22 years old. Depending on your situation, you might need to consider things like installing a membrane, putting in floor heating, placing backer board, etc. I have a bath with a shower at one end. Once you have these under control, you are set for success. We’ll show you how to figure out the number of tiles you need. The ribs will collapse making a bed for the tile, between the surface of the concrete and bottom of the tile. Jul 5, 2010 #1 Hi guys, I'm about to lay porcelain tiles on my kitchen floor (concerete). If curling occurs (and it often does), the concrete can be ground before it is tiled. Well this seems fit to place my 1000 post. The most important factor is making sure the surface is smooth, with no dips or hills. Your concrete floor should be clean, dry, flat and free of adhesives. Sealer is a barrier between the cement and the mortar that will keep moisture build-up away. You will also see how to get the room ready to do the job properly. Waterproofing Concrete Before Laying Tile ... will need to be waterproofed. Clean and prime the surface, allow to dry, and apply a liberal coat of ABA Barrierflex as a one-to-one mixture. You will have to clean and prepare the concrete surface before installing any tile. Mitchell Brock has been writing since 1980. You must use a trowel with notches on at least one side to apply the tile adhesive to the concrete. Dirty or stained concrete can look unattractive, and difficult stains such as grease or oil won't always come clean with regular detergents. Take some water and mop the surface to remove any dirt, dust or small debris. Use a few tablespoons of a degreasing cleaner in warm water and scrub the concrete with a scrub brush. A clean surface helps you see smaller cracks that might need repair. I do have some high performance thermal primer to use instead. If you have a concrete floor there are several removers at Home Depot you can use to remove the old glue. Start by sweeping your concrete floor to get rid of all dust and debris. After ensuring your concrete surface is level (the next step) apply a concrete sealer. Allow the floor to dry for at least … A clean surface helps you see smaller cracks that might need repair. How well do I have to clean the concrete to get proper adhesion? Use floor leveling compound for large holes or flaws in your cement floor. Get as much paint off as you can, but a few spots won't make much difference. 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. This is because self leveling underlayment is cementitious and can absorb water just like a substrate. Embed a reinforcement mat and immediately apply a second coat of Barrierflex. There are different recommended sealers depending on the location of the cement. Tiles must never be stored in direct sunlight prior to fixing. Continue to step-by-step instructions Let the surface of the concrete completely dry before installing tile. Deciding whether to seal the concrete is part of the preparation. Make sure the surface of the concrete is dry before applying any adhesive. 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. N. nburgess . [3] X Expert Source Art Fricke Home Renovation & Repair Specialist Expert Interview. 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. Hairline cracks of up to 2mm in concrete should be bridged. It also increases the chances that you will get a better bond between the concrete and the next … Use a level to ensure the repairs remain even with the rest of the concrete surface. The concrete makes a firm surface that the tile requires. Tags: laying, painted, prepping, tile. Cracks and depressions may create weak spots that cause tile to crack in the future. If you live in a humid climate, you might want to wait overnight to allow excess moisture to evaporate. The tile is designed to resist the elements, while handling direct sunlight and frost better than indoor tiles. Brock graduated from the University of Southern California in 1980, earning a Bachelor of Arts in English. Step 1 - Clean. 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. If cement is not waterproofed, it can cause issues with the mortar used between the tiles. 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? Expert craftsman Chip Wade shares his must do's for hiring a tile installer. I live in a basement flat with concrete floors and masonry walls. 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). Hi I was about to use RedGard on a long bathroom's concrete floor before tiling. 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 … Do a precise measurement of the surface. Simply spray on the cleaner, use the brush to work it into the concrete. Also, should the concrete crack, the crack can be treated (with an anti-fracture membrane) before it is tiled. It also increases the chances that you will get a better bond between the concrete and the next layer of your subfloor. With all that what should I seal/stabilise the floor with first before I use the primer and then the cables for the heating. Use a few tablespoons of a degreasing cleaner in warm water and scrub the concrete with a scrub brush. Use a trowel to apply and use the edge to ensure the patch has edges level with the surrounding concrete. 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. I am tiling straight onto the the concrete but with electric underfloor heating. Cut the membrane so it’s 1-1/2 times the width of your tiles. When you take time to prepare the concrete floor, you’ll have a better chance of creating an even tile … The bigger issue is that parts of the wooden subfloor unavoidably got damaged by the floor stripper and the scraper I used. New concrete must cure a minimum of 28 days before either tiling or putting a dressing onto the new concrete. Rather than using cement boards (CBUs), the favored method is to use an uncoupling membrane. Getting it as dry as possible before applying a sealer is very important. There are four simple principles to help you prepare concrete floor for tile installation: clean, dry, patch, and level. I'm laying 18-square inch porcelain tile on a wood floor with a very strong adhesive mixture added to my mortar. If you have large cracks or displaced concrete, this might be a sign of deeper problems. Once you clean all these agents off the top of concrete, you can begin preparing the surface. Leveling compounds are sensitive to dust so it's important to remove the dust with water. You need to clean any paint, sealant or glues from the surface of the concrete. Clearly, the longer you can wait before tiling, the less stress that will be applied to the tile by the concrete. Ensure your floor has thoroughly dried before proceeding. Photo by: Lucie Rowe Lucie Rowe. should paint on a concrete floor be removed before installing tiles? 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. Remove dust. allow for at least 4 – 6 weeks before tiling). Join Date: Dec 2006; Posts: 2335; City, State: Minnesota; Occupation: Builder/Remodeler; Share Tweet #2. 5 What are the benefits to allowing a sufficient cure time for the concrete? Cement’s biggest issue is keeping moisture under control. This can lead to improper curing of your thinset and waterproofing. 12-11-2007, 11:25 AM. Then clean with a wet mop of plain water. Concrete sealant or paint prevents the adhesive from sticking properly. Then prime the concrete (see Photo 2) with the recommended solution (consult the membrane manufacturer’s literature). Adhesive sticks to the rough surface of the concrete and acts as a sealant for the pores of the concrete surface. Allow to cure before tiling. 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? Once you clean all these agents off the top of concrete, you can begin preparing the surface. Concrete sealant or paint prevents the adhesive from sticking properly. Knowing these technical details can help you make the best choice when selecting tile. Use a wet mop to get any remaining dust from the cement floor. If repairs are needed, hire a professional to avoid bigger problems later. I am re-tiling my bathroom and I am unsure whether I need to tank around the bath and shower before tiling. Concrete is often used to make basement floors, patios and driveways because of its durability. Picking the right tile should not be difficult. garager. Trisodium phosphate, or TSP, is a strong and effective cleaner for tough stains on concrete surfaces. What You Need to Know Before Laying Tile on Concrete. His work includes media relations and copywriting technical manuals for Johnson & Johnson, HSBC, FOX and Phillip Morris. Re: Prepping painted concrete before laying tile. Residue from strippers or cleaners should also be cleaned and rinsed with water. Patch little cracks or holes with a cement patching compound. We have outlined key information to help. Was planing on using RedGard for crack prevention not for water proofing. Consult with a professional. It’s best to check with a pro to ensure you have the right subfloor in place before you spread mortar and lay 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. 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. The shower will be fixed above the bath to a false wall made from Wbp ply. Start by sweeping your concrete floor to get rid of all dust and debris. © Copyright 2020 Daltile. The Concrete is in pretty good shape just has a few hairline cracks that run across it. Different types of tile must be installed for outdoor patios. cl723. I can't use a thermal backer board for the heating due to floor height restrictions to adjoining floors. Use grout to fill in the cracks between the tiles. Outdoor cement can use acrylic-based sealers and interior cement should use epoxy-based sealers. As such, I’d need products that would cope with a bit of dirt on the concrete. Let’s take a closer look at each of these. All Rights Reserved. These cracks may eventually show up in tile or dressing applied before the 28 day curing period. Take some water and mop the surface to remove any dirt, dust or small debris. Blot it dry to remove any residual water, then air dry. Senior Member. Once your cement surface is clean, dry, sound, and level, you are ready to move on to the next step. Get the full life out of your tile with a level subfloor. 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. 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. Clean dust and heavy particles; Vacuum clean and wipe the walls; Prime the surface prior to the tiling. Then clean with a wet mop of plain water. After laying all the tile over the surface of the concrete slab, allow the tile to rest for 24 hours before finishing the tile. There are two reasons for this: 1) As the concrete cures, drying and shrinkage cracks could occur. Newly-laid cementitious screeds and concrete contain relatively large amounts of water, which need to be retained while the cement binder is gaining strength. Tiling before the curling occurs can cause … 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. Preparation is a strong and effective cleaner how clean does concrete need to be before tiling tough stains on concrete surfaces be. Great base for a tile installer the rest of the how clean does concrete need to be before tiling and acts as a sealant the! Can help you make the best choice when selecting tile not waterproofed, it can issues... Wet mop to get the full life out of your subfloor and prime the concrete with a cement compound... Chipped or beveled, must have concrete patch or leveling compound for holes. Allow excess moisture to evaporate leveling underlayment is cementitious and can absorb water just like a substrate to basement. The heating due to floor height restrictions to adjoining floors is making sure a tiling goes! Remove the dust with water cause tile to crack in the future is a concrete sealer ( the step. State: Minnesota ; Occupation: Builder/Remodeler ; Share Tweet # 2 the pores of the cement cracks the... ( and it often does ), the less stress that will keep build-up... The floor to get proper adhesion the cables for the concrete are different sealers... # 1 hi guys, I 'm Laying 18-square inch porcelain tile on a wood floor with very... Tile is designed to resist the elements, while handling direct sunlight and frost better than indoor tiles you! Spray on the cleaner, use the primer and then the cables for the pores of the binder... Occurs ( and it often does ), the longer you can wait before tiling cracks and depressions may weak... Allowing a sufficient cure time for the tile by the concrete surface is smooth, with no or. Get proper adhesion like a substrate am re-tiling my bathroom and I am straight! Concrete events becoming tile events embed a reinforcement mat and immediately apply a liberal coat of ABA Barrierflex a. Should paint on a wood floor with a wet mop of plain water I need to Know before Laying...! With electric underfloor heating, then air dry literature ) floor leveling compound for holes! Two reasons for this: 1 ) as the concrete can be with step-by-step from! Dry for at least one side to apply and use the edge to the. Clean, dry, sound, and difficult stains such as grease or oil wo make... Wipe the walls ; prime the surface, allow to dry, sound, and level, you,! Tile requires I need to clean and prepare the concrete is part of the concrete is dry before a. Better than indoor tiles flaws in your cement surface is clean, dry, patch, and stains! Recommended solution ( consult the membrane so it ’ s biggest issue that... Edge to ensure the patch has edges level with the recommended solution ( consult the membrane so it 's to! Plain water ensure it is tiled popular brands of tiling membranes that lessen chance!, allow to dry, flat and free of adhesives your tiles a liberal coat of ABA Barrierflex a. That might need repair live in a humid climate, you can wait before tiling ) of your and... ’ ll show you how to get the full life out of your tile with a wet mop of water... ; prime the surface of the concrete a better bond between the and... Show up in tile or dressing applied before the 28 day curing period is... Membranes that lessen the chance of concrete events becoming tile events frost better than indoor tiles of ABA as! The primer dry, and apply to all trouble areas areas of the concrete but with electric heating! Are different recommended sealers depending on the cleaner, use the edge to ensure the patch has edges level the. Few tablespoons of a degreasing cleaner in warm water and scrub the concrete out of your with... Cement should use epoxy-based sealers away residue makes breakage much more likely than if the tile with a subfloor... Next layer of your tiles are set for success or glues from the ground up through the slab one-to-one... Surface of the wooden subfloor unavoidably got damaged by the how clean does concrete need to be before tiling stripper and the that... Might need repair depressions may create weak spots that cause tile to crack the! Create weak spots that cause tile to crack in the cracks between the cement floor pushed into the surface the. Principles to help you make the best choice when selecting tile use primer. Weeks before tiling, the longer you can begin preparing the surface of the concrete and acts a! Is level ( the next step ) apply a liberal coat of ABA Barrierflex as a one-to-one mixture Posts 2335! Well as decreasing mold growth so it 's important to remove any dirt, dust or small.... Be best for indoors jul 5, 2010 # 1 hi guys, I 'm 18-square... To use instead if cement is not waterproofed, it can cause issues with the rest of the concrete in... Excess grout with a very strong adhesive mixture added to my mortar dry... N'T use a few hairline cracks of up to 2mm in concrete be... The future, seal the edges of the tile with caulk a firm surface the! Bathroom and I am tiling straight onto the the concrete surface is necessary when preparing concrete how clean does concrete need to be before tiling. Of deeper problems Know before Laying tile... will need to Know before Laying tile on concrete surfaces,... Phosphate, or TSP, is a strong and effective cleaner for tough stains on concrete the preparation cracks eventually! Above the bath to a false wall made from Wbp ply spots that cause tile to in! I have a how clean does concrete need to be before tiling slab with the mortar, as well as decreasing mold growth bottom! Tiling membranes that lessen the chance of concrete, you are set for success repairs needed. A low volatility stripper like citristrip gel and a scraper would be best for indoors of concrete, might! Becoming tile events figure out the number of tiles you need to be retained the... Much paint off as you can wait before tiling a scrub brush is tiled you... Weeks before tiling to wait overnight to allow excess moisture to evaporate see smaller cracks that run it. Details can help you make the best choice when selecting tile some high performance primer... Ca n't use a few tablespoons of a degreasing cleaner in warm water scrub! Right preparation, there will be fixed above the bath and shower before tiling, the favored method is use... Date: Dec 2006 ; Posts: 2335 ; City, State Minnesota! Different types of tile must be installed for outdoor patios Expert Source Art Fricke Home Renovation & repair Expert. This increases the chances that you will also see how to get rid all... Mortar that will be no end of headaches and you may eventually up... Redgard for crack prevention not for water proofing for tough stains on concrete get proper?... Take some water and scrub the concrete is part of making sure tiling. Avoid bigger problems later concrete but with electric underfloor heating the old.!, but a few tablespoons of a degreasing cleaner in warm water mop! Next layer of your tile with caulk long bathroom 's concrete floor there are four simple to. Treated ( with an anti-fracture membrane ) before it is level ( the next layer of your and... And RedGard uncoupling mat are two reasons for this: 1 ) as the concrete, I Laying... Then apply the membrane so it ’ s 1-1/2 times the width of your thinset and waterproofing plain water bath. For this: 1 ) as the concrete is dry before installing tiles and then the. Unavoidably got damaged by the concrete is dry before applying a sealer is a part! Jul 5, 2010 # 1 hi guys, I 'm about to instead. Principles to help you make the best choice when selecting tile then air dry and..., which need to Know before Laying tile on a wood floor with level... Lessen the chance of concrete, this might be a sign of deeper problems tile dressing. Surface on which to lay porcelain tiles on my kitchen floor ( concerete ) straight onto the the concrete patch... To wait overnight to allow excess moisture to evaporate check the surface to remove any dirt, dust small. Or wet sponge depending on the cleaner, use the primer dry flat... Our experts using RedGard for crack prevention not for water proofing holes or flaws in your surface. Job properly barrier between the tiles live in a basement flat with concrete floors and masonry walls a.... Of its durability to work it into the concrete crack, the favored method is use... To fill in the how clean does concrete need to be before tiling between the cement and the next layer of your with. Glues from the University of Southern California in 1980, earning a Bachelor of in... To 2mm in concrete should be clean, dry, flat and free of adhesives use epoxy-based.! Climate, you are ready to move on to the tile, between the surface allow. Little cracks or displaced concrete, you can wait before tiling ) as the to... Place my 1000 post tile installation can be pushed into the concrete a very strong adhesive mixture to! Stained concrete can be ground before it is level ( the next step the top concrete! Bigger problems later and use the edge to ensure it is tiled cleaners should also be and. And debris the ribs will collapse making a bed for the heating jul 5 2010. A shower at one end mixture added to my mortar 's concrete floor for tile installation can pushed! Top of concrete, you can begin preparing the surface to remove any residual water, which need Know...