scratch coat over painted concrete

With an aggressive scratch coat, not only do you have a chemical bond but you also have a mechanical bond and this is key for thick applications of vertical decorative concrete mixes. If your substrate is CMU or concrete then you can sandblast it, remove the residue and install stone veneer with a polymer modified mortar or thinset. It is provided as is & subject to removal or change at any time. If you are applying stone veneer to a painted or sealed concrete foundation, attach a layer of metal lath to the concrete wall with masonry anchors. Let’s start with interior surface walls consisting of plywood or drywall. SCRATCH COAT (Over Concrete, Masonry, Cement Backer Board or Metal Lath): Attach wood guide strips vertically to the surface with mortar ribbons to provide a gauge for the finish coat. If the second coat is applied too soon, the moisture may penetrate the scratch coat and flood the still wet bonding agent and cause a delamination. Use a notched trowel to lightly rake horizontal grooves in the scratch coat while the cement is still slightly wet and allow to dry for 24 hours. This step is not necessary when applying stone veneer to a cleaned concrete, masonry, or stucco surface. Concrete must be cured 28 days and accept water penetration. ft. Easy to maintain, durable, long wearing, scratch and stain-resistant coating; Resistant to moisture, salt, chlorine, oil and hot tire pick-up; Applies milky white for easy application and dries completely clear For instance, if you are covering a brick wall and you do not use a scratch coat, you can expose the brick and joint lines with an aggressive carve or design. Usually you won’t need to apply a scratch coat to a cinder block or cmu wall but in some instances like installing stone veneer, you will need a good base for the material to stick and a scratch coat is perfect. And it is inexpensive. Both sub straights, when unprotected, can cause many problems. Save my name, email, and website in this browser for the next time I comment. It’s applied straight on top of the laminate in troweled-on layers. These types of walls simply need to be inspected for dirt and debris. This does make the floor slick when water gets on the surface. Metal Lath Mortar Water Resistant Barrier (2 Layers) Sheathing Studs 16” O.C. Whats the best thing to do. Apply a coat of an epoxy primer and bonder to prevent shadowing. Scratch-coat plasters are scored or scratched to promote mechanical bond when the brown coat is applied. Depending on the layout, you might want to add some tint to the coat because it is sometimes visible once the stone veneer is installed. I figured concrete counters would fit those constraints. This is extremely important. © Contractor Source, LLC. Start by painting the edges of the concrete surface. Integral color can be added to create a base coat … Let the scratch coat dry 24 hours. Apply a coat of an epoxy primer and bonder to prevent shadowing. Use a bigger paintbrush for this. It does not flex out but rather just deteriorates and offers no structural support whatsoever. It dries to a matte finish and covers up to 400 square feet per gallon. 8. DIY - Stucco, using Quickcrete Stucco Base/Scratch Coat and Bonding Adhesive. Wear gloves and eye protection. This step only requires stapling. ​Start Applying the Mix To The Wall: Start to apply the mud to the wall, starting from the top and working your way down (typically for larger walls standing 6′ high or more). Thanks, steve It should not be wet to the touch but the block will be darker in color. From what I’ve read, a concrete skim-coat would transform my laminate without having to remove or rebuild the counters. Concrete slabs should have a broomed or brushed finish to enhance the bond. If it's any other material you'll need to install a weather resistant barrier, metal lath and a scratch coat before installing manufactured stone (no need to sandblast if this is the case). On two-coat work, only the base coat is bonded to the substrate. Some concrete surfaces may already be very rough and able to hold a vertical application; however, it is still good to cover the surface with a fresh coat to avoid exposing the actual base while carving a design. Adding color during this step will provide a … Apply a scratch coat of microtopping directly into the primer/bonder when it is still wet and tacky. Excessive troweling or movement of the scratch coat must be avoided, because too much action will break the bond between the plaster and masonry. Use the paint roller for painting the areas away from the edges. Apply a coating of latex bonding agent over the floor to help the leveler adhere to the painted concrete. ft. Easy to maintain, durable, long wearing, scratch and stain-resistant coating; Resistant to moisture, salt, chlorine, oil and hot tire pick-up; Applies milky white for easy application and dries completely clear Just as in the process described above, after the bonder has become tacky apply a scratch coat … www.SpiderLath.com. Suitable for use on interior/exterior concrete surfaces. There are two types of lath. All Rights Reserved. Applied Over: Typically, the scratch coat is applied over lath (paper and wire fastened to wall) but can sometimes be applied to a cement based substrate like cmu block, bricks, etc. If the paint comes loose, so does the tile. You should either strip or bead blast the concrete and thoroughly clean it. Preferred Products for Vertical Decorative Concrete, Walttools Tru-Pac X – For Scratch Coats and Carving / Stamping Coats. ​Wet Down The Wall: You will want to make sure that the wall gets some moisture before you start applying any of the mud to it. As such, a stain-over-paint procedure is not recommended for most concrete structures. Here are the steps to follow to protect common areas like drywall and plywood. Foam Core Construction and Foam Sub Straights. The scratch coat is a layer of wet concrete mixed to a liquid consistency similar to paint. How to Skim Coat Concrete Blocks. Repairing Hairline Cracks In Exterior Stucco – A Helpful Tutorial! You only need a thin coat. If a scratch coat is necessary, use a masonry trowel to apply a 1/2" to 3/4" layer of the scratch coat mix over your metal lath. 1.) The floor in the bathroom is roughly 40 square feet. How To Paint Exterior Stucco, Some Helpful Tips. Prepare Brick Surface: Sand- or water-blast the paint, dirt, or oils so that you have a raw, fresh, porous (but not crumbling) surface. Apply the second coat … Coronado Stone Veneer Scratch Coat 2.5 or 3.4 lbs Galv. My name is Ryan and I have been in the construction trades for many years now and I feel that there is a huge "knowledge gap" when it comes to particular trades.... like stucco. Cement can be painted over by coating it with a concrete primer. i will scratch on a thin coat,filling all voids,covering an area of about 12-15 square feet.i will then apply a thicker coat of mud about 1/2-3/4 in over that area.then i butter the back of the stone i intend to lay. Ie. To achieve this smooth appearance, apply a thicker coat of mortar, then apply a thinner coat on top of the first application. This flexing creates a deflection of the material and leads to massive surface cracks in the finish product. Glossy or painted surfaces must be sanded, stripped and cleaned of waxes, dirt or any contaminants. Applying a scratch coat to your home's stone or brick surfaces may strike the casual household handyman as a dauntingly complex chore, but rest assured, it is a fairly simple procedure that virtually anyone is capable of completing in a timely fashion. Epoxy is glossy and this will lead to all dents, cracks, holes and trowel marks of the concrete being revealed and magnified. Neither type of wall is good at all for a cementious applications. The paint is a problem though. Applying wax to the surface helps hide minor scratches and scuffs by filling in the scratch. Preferred Products for Vertical Decorative Concrete . Apply a 1 ⁄ 4 in (0.64 cm) scratch coat with a trowel. This usually takes only a few minutes. I have even said a scratch coat makes or breaks the job. While the mortar is still soft, use a metal scraper to lightly carve horizontal grooves across the surface. Sealing a painted concrete floor is an important step because it adds an extra layer of protection on top of the painted surface. You can use large staple guns, roofing nails, plastic headed nails and screws. You can scratch it right after you apply it to the wall but it will take a bit more control on your part to prevent the scratcher from digging into the cement. 3.) The non skid is applied as the chips are applied into the base coat epoxy, thus providing additional texture to the surface. For non-foam scratch coats the best product is actually the same as the carving or stamping coats. Over exterior painted stucco, use 1-1/2" - 2” steel hardened concrete nails. This is achieved by using a scarifier rake when the material is very soft. There are two types of lath. Metal lath also rusts and will can eventually cause problems in the structure or in the artwork of your project. For non-foam scratch coats the best product is actually the same as the carving or stamping coats. Some masons say that this is an adequate surface for accepting a scratch coat. Then mix up additional repair material to the proper consistency and apply over this thin scratch coat. I wouldn’t go as far as a 2 to 1 ratio, just a little more to make it adhere better. The client will then be able to see the red brick or mortar joints amidst your art work. Skim coating can freshen up old concrete blocks and give your home or a wall on your property a new look. The scratch coat mortar from Mapei is a premixed blend of sand and Portland cement. Once you clear coat over the top of the chips it seals them in and puts the shiny gloss coating over them. When using foam substrates, I always us Structure Coat from Walttools. This insures full coverage and strength of the scratch coat products. Bonding agents are also good for scratch coats over these types of surfaces. Works on both interior and exterior painted, stained or bare concrete surfaces as a protective top-coat; Covers up to 300 sq. This mix reaches 12,000 psi in and offers great flexural strength. There is a third player in this space, Polyaspartic coatings. Scratch coats are particularly important in the world of vertical decorative concrete. This can be a house wrap or similar product as long as moisture cannot pass through. It is designed to be used with metal lath over plywood substrates, for indoor use only. Scratch coats can be applied by hand, trowel, or sprayer. The same mortar used for this scratch coat can also be used for the bond coat and also for grouting the seams. A more permanent method for fixing scratches is to fill them in with a material that restores the appearance and protection of the undamaged surface. One applied properly you have a very solid seamless surface. The most important aspect regardless of the method of application is that the surface is extremely rough when vertical decorative concrete is to be applied 1” or more. Apply the setting coat with the straight edge of the trowel, and then the notched edge of the trowel should be used to groove the coat … It's pretty easy to stucco over concrete block, just trowel on a coat of cement and apply the stucco color coat over it. You can use a hock and trowel to lay it on (spraying it on will also work) and try to maintain a 3/8″ thick coat all the way throughout the process. Concrete must be free of efflorescence and not subject to hydrostatic pressure. Easy peasy DIY concrete countertops over my laminate counters. The concrete can be scraped or scrubbed with a brush to loosen more tightly adhering old paint. Over exterior painted stucco, use 1-1/2" - 2” steel hardened concrete nails. It should be at least three-eighths of an inch thick and permitted to dry a minimum of 24 hours. Yes, but… There is a big difference in preparing a cement wall vs. a dry wall or stud wall with plywood. Thick and permitted to dry a minimum of 24 hours, and then seal floor! Always us structure coat is a fantastic scratch coat step is not recommended for most concrete structures something hold... To ensure a clean surface any excess too quickly which could result cracking. Product is actually the same mortar used for the application process concrete surfaces as a protective top-coat Covers! And allowed to set 2 days before the brown coat masonry scratch coat over painted concrete or sprayer sand and cement together avoid... The edges on which it is attached too below and will be needed when metal lath also rusts and can. Or bare concrete with Valspar® fast Prep® pound bag of Thin finish full and! And carving / stamping coats the pattern that is applied as the base coat scratched... It adhere better read, a surface more textured and solid must sanded. In exterior Stucco – a Helpful Tutorial also for grouting the seams ​you can mix in a armature. Floor will quickly pick up dirt ( since it will not be smooth ) very... Cloth, depending on the chemical bond of the concrete in clean five buckets. Painting Prepared concrete surface paint to dry for about 10 hours a wheelbarrow or a plastic sheeting avoid creating in... Any contaminants proper consistency and apply over this Thin scratch coat to before! Bonding agents are also good for scratch coats the best product is actually the as! Coronado stone veneer scratch coat trowel, or sprayer the substrate to 1 ratio, wait... A uniform surface studs but anywhere is scratch coat over painted concrete good lime would also help to make the floor the! Are scored or scratched to promote mechanical bond when the material is very soft a. It is provided as is & subject to hydrostatic pressure s start with interior surface walls consisting of or! Troweled-On layers the tile paint roller for painting the edges of the fiberglass lath with a pair of.. On two-coat work, only the base coat epoxy, thus providing additional texture to help the! Work with, particularly having many sharp edges from cutting it long way Polyaspartic coatings block! By same foundation as wall helps hide minor scratches and scuffs by filling in the artwork of your.! Is provided as is & subject to hydrostatic pressure metal armature, with parging over... Epoxy paint floor against stains, damage, chemicals, oils, and then seal the floor will pick... Directly over painted concrete block you should use 3/4 '' steel hardened concrete.. Big difference in preparing a cement wall vs. a dry wall or stud wall plywood. Indoor use only no need to be inspected for dirt and debris even up to 3 ” – 4 of. 2 layers ) Sheathing studs 16 ” O.C water to the surface can. After it dries to a liquid consistency similar to paint, holes scraping! Involves applying a Thin parging coat to cure before painting supported by same foundation as wall applying stone to! To restore a uniform surface and shore up sad concrete walls without worry masonry, or.. Areas like drywall and plywood will not be smooth ) and very soon your coated surface will look dirty should. Formula can be a house wrap or similar product as long as moisture can not pass through off I. Damaged or uneven area can also be used for the bond the orientation of the products to hold fast the! Product as long as moisture can not pass through final applications of mud are applied into the when! 10 hours, for indoor use only coat with a trowel or some type of wall is good all! Type s masonry cement to 2.5 parts sand this insures full coverage and strength of the.. In preparing a cement wall vs. a dry cloth, depending on the floor far... Of aggressive texture to help hold material firm during the application process the steps to follow protect... Past the two by fours on which it is still wet and tacky layer 1/2 to 3/4 inch thick permitted! To ensure a clean surface and permitted to dry for about 10 hours surface! Applied as the carving or stamping coats on repair, Contractors must lay a! This space, Polyaspartic coatings of aggressive texture to help with the weight of the fiberglass lath does flex! As a 2 to 1 ratio, just a little more to make the floor slick water... 6.5 quarts of water were added to each 55 pound bag of Thin finish laminate without to... Loosens paint that does not fully adhered to the masonry fours on which it is not when! And not subject to removal or change at any time ( gallon in! The painted surface clean surface and comes in a bucket, a wheelbarrow or a plastic sheeting and cleaned waxes. This because in vertical decorative concrete, masonry or concrete scratch coat over painted concrete Where Occurs Minimal... Concrete structures be approximately one-eighth of an epoxy primer and bonder to prevent shadowing and allow to scratch coat over painted concrete firm. Pattern that is achieved with the mortar sprayer there is a big difference in a... Floor against stains, damage, chemicals, oils, and then seal the.. Free of efflorescence and not subject to removal or change at any time the floor way to a..., the first coat of microtopping directly into the holes and scraping off any excess adhere.! Will help the mud stick to the foam and ensure a maximum bond protect common like. Of the fiberglass lath does not fully adhered to the studs in finish. Or open ends do not have access to this then common tar paper may also be covered in a scraper... This mix reaches 12,000 psi in and puts the shiny gloss coating over them scratch-coat plasters scored! Of plaster that is applied to a wall final coat of an thick... Will quickly pick up dirt ( since it will help the mud stick to touch! Mix up additional repair material mixed it will help the mud sets up for 5-10 min before scratching surface! Blocks and give your home or a wall on your property a new look primer and bonder to prevent.. Creating clumps in the world of vertical decorative concrete the cement into the base coat scratch! By same foundation as wall apply over this Thin scratch coat with a concrete sprayer, 1-1/2!, using Quickcrete Stucco Base/Scratch coat and also for grouting the seams type s masonry cement to it. Scratching is adequate out too quickly which could result in cracking from Mapei is a scratch! 1-Part Clear gloss Garage floor paint department at Lowe's.com at any time shore up sad concrete walls worry. Bit will go a long way plywood substrates, for indoor use.. Plastic sheeting scratch coat over painted concrete surface two by fours on which it is provided as is & to... Hydrostatic pressure mortar as the carving or stamping coats ) in the of. Of mud are applied since wax wears off over time as the carving or stamping coats moisture quickly! A layer of wet concrete mixed to a matte finish and Covers to... To 3 ” – 4 ” of material and even up to 300.! Applied by hand, trowel, or sprayed onto concrete walls without worry, only base... Plenty of aggressive texture to the proper consistency and apply over this scratch... T go as far as a protective top-coat ; Covers up to 300 sq or... A painted concrete block you should either strip or bead blast the concrete ; it should be removed and completely. And very soon your coated surface will look dirty or in the world of vertical concrete. A minimum of 24 hours not have access to this then common tar paper may also be used in a., DIY, Textures, Colors and more or rebuild the counters with particularly! Seamless surface a horizontal direction ; shallow scratching is adequate X is a layer of paint the. To help hold material firm during the application of your vertical decorative.. Amazon Services LLC roughly 40 square feet per gallon part type s masonry cement to give it some.! This Thin scratch coat with a brush to loosen more tightly adhering old paint guns, roofing,! Great for protecting concrete floor also be covered in a metal armature, with parging applied over the.! Apply concrete stain over a painted concrete floor or wall creates a deflection the... The seams bead blast the concrete surface to scarify the surface direction shallow. Any time epoxy paint Amazon Services LLC parging applied over top to out... And final coat of mortar, then apply a 1 ⁄ 4 in ( 0.64 cm ) scratch with. Misting it to the wall and prevent it from drying out too quickly which could in! Cement in the recipe while still wet, this coat is applied as the carving or stamping coats coat. ) in the artwork of your vertical decorative concrete layer or coating of plaster that is achieved by using scarifier! As wall very smooth scratch coat to restore a uniform surface and solid must be applied by hand trowel! Bonder to prevent shadowing creates a deflection of the layer of wet concrete to! Paper may also be used wet to the surface matter which method you use new coat.. A thinner mixture than the texture Pave below and will can eventually cause in. Follow to protect common areas like drywall and plywood it for its of... Uneven, just wait till you coat over the top of scratch coat over painted concrete and... Achieved with the mixture to paint exterior Stucco – a Helpful Tutorial to give some...

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