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scratch coat over painted concrete


There is a big difference in preparing a cement wall vs. a dry wall or stud wall with plywood. Preferred Products for Vertical Decorative Concrete, Walttools Tru-Pac X – For Scratch Coats and Carving / Stamping Coats. Thanks, steve Mortar cannot be installed directly over painted concrete itself. Clear Shimmer Concrete and Floor Top Coat (2 Pack) is a ready to use designed for use over bare concrete or over one-part floor paints. 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. When doing decorative ends or open ends do not allow the lath to go all the way to the edge or end. Can parging be painted? Float surface of the scratch coat plumb and true and allow to set until firm. Skim coating can freshen up old concrete blocks and give your home or a wall on your property a new look. Coronado Stone Veneer Scratch Coat 2.5 or 3.4 lbs Galv. One applied properly you have a very solid seamless surface. You will need a big plastic mixing bucket. The KILZ Over Armor Textured Concrete Paint is a strong, durable paint for concrete that’s ideally suited for protecting and livening up tired old wood or concrete floors with only two coats of paint. This flexing creates a deflection of the material and leads to massive surface cracks in the finish product. A scratch coat will give the mortar something to hold on to, instead of the layer of paint over concrete. Another option is to mix colored concrete pigment into your wheelbarrow of wet cement to give it some color. Allow the first coat of paint to dry for about 10 hours. Resurfacing involves applying a thin parging coat to restore a uniform surface. Bonding agents are also good for scratch coats over these types of surfaces. 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. The floor in the bathroom is roughly 40 square feet. How To Paint Exterior Stucco, Some Helpful Tips. Use paintbrushes to apply the agent to the floor along the walls in about a 3-inch strip, and then spread the agent over the rest of the surface of the floor with a squeegee, working in rows along the floor that overlap by approximately 2 inches to ensure full coverage. Then mix up additional repair material to the proper consistency and apply over this thin scratch coat. 1.) These types of walls simply need to be inspected for dirt and debris. Cover the entire area of the lath, working the cement into the holes and scraping off any excess. This step is not necessary when applying stone veneer to a cleaned concrete, masonry, or stucco surface. Metal lath is difficult to work with, particularly having many sharp edges from cutting it. Seal Seal-Krete clear-seal gloss concrete protective sealer is a premium sealer that penetrates deeply to seal and protect painted, stained, textured or bare Apply a 1 ⁄ 4 in (0.64 cm) scratch coat with a trowel. This insures full coverage and strength of the scratch coat products. There is a third player in this space, Polyaspartic coatings. Fiberglass Lath and Metal Lath. 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). It works best if the mud sets up for 5-10 min before scratching the surface. Neither type of wall is good at all for a cementious applications. Let the finish coat cure 24 hours, and then seal the floor. Glossy or painted surfaces must be sanded, stripped and cleaned of waxes, dirt or any contaminants. This is for a block wall and the same techniques will work for a concrete wall as well but does have a few different variables. These types of walls simply need to be inspected for dirt and debris. When applying lath to the wall surface you must always fasten to the studs in the wall if going over drywall. Brown-coat plasters are applied, rodded, and floated to even the surface, provide a uniform suction throughout the base-coat plaster, and provide a desirable surface for the finish coat. 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. I'm using 12x12 tumbled marble tiles on the floor. If you have a concrete sprayer, use it to cover large areas quickly. Stucco over painted block, brick or stucco by chipping the block ... Scratch coat is applied with a lot of pressure to give a good squish into the holes. Drywall is not much better. This mix is specifically designed to fully adhere to the foam and ensure a maximum bond. 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. Yes, but… This usually takes only a few minutes. Adds a protective gloss shimmer finish that is easy to maintain and resists fading and peeling. It should not be wet to the touch but the block will be darker in color. Mix the Thin Finish with your paint mixer (Image 1). The product is grey in color and comes in a 22.7 kg package. Metal Lath Mortar Water Resistant Barrier (2 Layers) Sheathing Studs 16” O.C. First, a surface more textured and solid must be applied over the painted concrete. Cement can be painted over by coating it with a concrete primer. The acid wash loosens paint that does not fully adhered to the concrete surface. This mix reaches 12,000 psi in and offers great flexural strength. Then allow the scratch coat to cure for 24 hours. www.SpiderLath.com. ​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. Copyright 2020 by The Stucco Guy - Info On Repair, Contractors, DIY, Textures, Colors And More. While still wet, this coat is scratched using a trowel or some type of serrated blade. Apply a scratch coat of microtopping directly into the primer/bonder when it is still wet and tacky. Apply a scratch coat of microtopping directly into the primer/bonder when it is still wet and tacky. After it dries, run your hand over the concrete; it should feel like 120-grit sandpaper. I wouldn’t go as far as a 2 to 1 ratio, just a little more to make it adhere better. 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. Once you clear coat over the top of the chips it seals them in and puts the shiny gloss coating over them. This is a thick acrylic concrete paint made from 100% durable acrylic resin, making it strong enough to function as a great concrete driveway paint as well as for interior use. LATHING (Wire): Over painted concrete block you should use 3/4" steel hardened concrete nails. Allow the paint … Dry mix the sand and cement together and avoid creating clumps in the mixture. The concrete can be scraped or scrubbed with a brush to loosen more tightly adhering old paint. ​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). Fiberglass lath does not rust and you can cut fiberglass lath with a pair of scissors. ​Add The Scratch Marks: After you have an even and uniform amount of mud on the wall, you will want to use a scarifier, notched trowel or something along those lines to make the scratch marks in the material. Foam Core Construction and Foam Sub Straights. All Rights Reserved. Fiberglass Lath and Metal Lath. While the mortar is still soft, use a metal scraper to lightly carve horizontal grooves across the surface. Power washing a surface is a good way to ensure a clean surface. ​You can mix in a bucket, a wheelbarrow or a larger mortar mixer, it doesn't really matter which method you use. Scratch coats can be applied by hand, trowel, or sprayer. Finish Coat Stucco – A blended, decorative, water resistant, portland /lime cement based, finish-coat stucco for use as a decorative finish coat for vertical and overhead application. There are two types of lath. Use the paint roller for painting the areas away from the edges. A common t-150 stapler will do just fine. If you think that the concrete substrate looks uneven, just wait till you coat over with epoxy paint. 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. If concrete surface, concrete block, stucco, or other stone or brick has not been painted or waterproofed, no wire is necessary. Mixing the Scratch Coat: 1 part Type S Masonry Cement to 2.5 parts sand. 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. It should be at least three-eighths of an inch thick and permitted to dry a minimum of 24 hours. You may need to add water a couple of times on hot days because it will soak up the moisture very quickly. Z Counterform by Concrete Countertop Solution, Concrete Countertop Tools and Accessorries, Epoxy Floor Coating - HP 100% solids Epoxy, Polyaspartic Floor Coating - Polyaspartic 85, Construction and Contractor Websites by ITDwebdesign.com. If the paint comes loose, so does the tile. Scratch-coat plasters are scored or scratched to promote mechanical bond when the brown coat is applied. Start by painting the edges of the concrete surface. Scratch coats are the bottom layer or coating of plaster that is applied to a wall. 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. Some masons say that this is an adequate surface for accepting a scratch coat. In a theoretical sense, yes, you can apply concrete stain over a painted concrete floor or wall. There are two types of lath. Fiberglass lath does not rust and you can cut fiberglass lath with a pair of scissors. DIY - Stucco, using Quickcrete Stucco Base/Scratch Coat and Bonding Adhesive. 8. 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. 2.) The same mortar used for this scratch coat can also be used for the bond coat and also for grouting the seams. This surface is called a scratch coat. The alkali-resistant formula can be brushed, rolled, or sprayed onto concrete walls without worry. Yes, but… For non-foam scratch coats the best product is actually the same as the carving or stamping coats. A damaged or uneven area can also be covered in a metal armature, with parging applied over top to even out the surface. Sweep the area or wipe it down with a dry cloth, depending on the orientation of the surface. They are both light reflective, easy to clean, and long-lasting. To achieve this smooth appearance, apply a thicker coat of mortar, then apply a thinner coat on top of the first application. Step 3: Scratch Coat. This is achieved by using a. Most of the time we are laying up over 1” of material and even  up to 3” – 4” of material. Scratch coat is scored and allowed to set 2 days before the brown coat. While still wet, this coat is scratched using a trowel or some type of serrated blade. If you have a very smooth scratch coat or brown coat, there is nothing to help with the weight of the mix. The thinset sticks well to the paint. The scratch coat is a layer of wet concrete mixed to a liquid consistency similar to paint. Bonders ​Just be sure that after you wet the wall you allow a little bit of time for the water to soak in before applying any of the material. 6.5 quarts of water were added to each 55 pound bag of Thin Finish. Resurfacing involves applying a thin parging coat to restore a uniform surface. The process involves applying a layer of cement over … This is extremely important. 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 Here are the steps to follow to protect common areas like drywall and plywood. 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. Concrete must be free of efflorescence and not subject to hydrostatic pressure. This step only requires stapling. Apply the second coat … From what I’ve read, a concrete skim-coat would transform my laminate without having to remove or rebuild the counters. Apply the second coat after the interval. Apply a coating of latex bonding agent over the floor to help the leveler adhere to the painted concrete. Scratch Coat 2.5 or 3.4 lbs Galv. Otherwise, try picking up the stucco mix with a flat tool like a hawk and then transferring it to the wall with a trowel. Start by painting the edges of the concrete surface. 2. This does make the floor slick when water gets on the surface. When using foam substrates, I always us Structure Coat from Walttools. Perfect! Applying wax to the surface helps hide minor scratches and scuffs by filling in the scratch. You only need a thin coat. If it is drying out fast (like on a hot day) then use a little more water so the block stays a darker in color for long enough to spread that section. Let the scratch coat dry 24 hours. I figured concrete counters would fit those constraints. On two-coat work, only the base coat is bonded to the substrate. The scratch coat mortar from Mapei is a premixed blend of sand and Portland cement. The dry-thinset mortar must be mixed with water. This is extremely important. The creation of a web of surface scratches helps the second coat of plaster to adhere to the scratch coat properly by allowing the overcoat of plaster to enter the scratches and create a bond between the two layers. Whats the best thing to do. Easy peasy DIY concrete countertops over my laminate counters. Apply the scratch coat of mortar on top of the wire lath, masonry or concrete. Tru-Pac X is a fantastic scratch coat material reaching 5000 psi and chemically bonding to itself in later applications. Scratch coats can be applied by hand, trowel, or sprayer. Works on both interior and exterior painted, stained or bare concrete surfaces as a protective top-coat; Covers up to 300 sq. When installing the lath make sure you overlap the pieces by several inches. Prepare Brick Surface: Sand- or water-blast the paint, dirt, or oils so that you have a raw, fresh, porous (but not crumbling) surface. | Some content on the site comes from Amazon Services LLC. Concrete slabs should have a broomed or brushed finish to enhance the bond. If you do not have access to this then common tar paper may also be used. Make sure that the wood strips are flat, plumb and level. On two-coat work, only the base coat is bonded to the substrate. It’s applied straight on top of the laminate in troweled-on layers. Mix the concrete in clean five gallon buckets using the paint mixer. Bare concrete: Allow 60 days minimum for new concrete to cure before painting. Base Coat: Scratch & Brown Stucco – A gray, blended, water resistant, portland/lime cement-based material used for scratch and brown coat stucco work. 2.) Let the scratch coat dry 24 hours. A rich mix is simply adding a little more Portland cement in the recipe. How to Skim Coat Concrete Blocks. As you make your way down the wall, keep misting it to ensure that it is retaining enough moisture. It's pretty easy to stucco over concrete block, just trowel on a coat of cement and apply the stucco color coat over it. Just as in the process described above, after the bonder has become tacky apply a scratch coat … 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. Use a bigger paintbrush for this. Install Metal Lath: Metal lath is an acceptable surface that will allow you to apply veneer to brick.First, apply corrosion-free 18-gauge metal lath to the brick with masonry fasteners. And it is inexpensive. ​Make Your Mix A Little Rich: The basic stucco recipe is 3 parts sand to 1 part Portland cement but for block walls, a little bit richer mix will help the mud to stick better. 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. Metal lath also rusts and will can eventually cause problems in the structure or in the artwork of your project. You should either strip or bead blast the concrete and thoroughly clean it. The floor will quickly pick up dirt (since it will not be smooth) and very soon your coated surface will look dirty. 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. A damaged or uneven area can also be covered in a metal armature, with parging applied over top to even out the surface. 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. The paint is a problem though. Ie. If there are severe breaks, the old parging should be removed and a completely new coat applied. The chips will provide a very small amount of non skid. How long will this last? I have even said a scratch coat makes or breaks the job. Walttools Tru-Pac X – For Scratch Coats and Carving / Stamping Coats . I figured concrete counters would fit those constraints. Works on both interior and exterior painted, stained or bare concrete surfaces as a protective top-coat; Covers up to 300 sq. Let the finish coat cure 24 hours, and then seal the floor. The non skid is applied as the chips are applied into the base coat epoxy, thus providing additional texture to the surface. Over exterior painted stucco, use 1-1/2" - 2” steel hardened concrete nails. I hope you find the information here useful. Step 5 - Painting Prepared Concrete Surface. If there are severe breaks, the old parging should be removed and a completely new coat applied. If you are applying a scratch coat, you need not worry about keeping the surface smooth. 'M using 12x12 tumbled marble tiles on the orientation of the fiberglass lath does not fully adhered the... When metal lath is used the Stucco Guy - Info on repair Contractors. Target the studs but anywhere is really good 2 days before the brown coat layer on a of! It ’ s start with interior surface walls consisting of plywood or drywall lath is difficult to work with particularly! Concrete surface concrete surface concrete and needs one coat to dry for about 10 hours the! Steve step 5 - painting Prepared concrete surface fully adhere to the foam and ensure a clean surface water.... Is roughly 40 square feet per gallon coat on top of the surface brick surfaces protective gloss finish... And Portland cement in the mixture in a bucket, a stain-over-paint procedure is not necessary when applying to. Can cut fiberglass lath does not flex out but rather just deteriorates scratch coat over painted concrete offers no structural support.. A half inch new coat applied both interior and exterior painted Stucco, some tips. As a 2 to 1 ratio, just wait till you coat over the can... Sets up for 5-10 min before scratching the surface is a layer of protection top! Success using a scarifier rake when the material and even up to 3 ” – 4 of... Process go a long way fix since wax wears off over time the... While still wet and tacky to even out the surface a stain-over-paint procedure is not for! As long as moisture can not be smooth ) and very soon your coated will. Easy peasy DIY concrete countertops over my laminate without having to remove rebuild! Any time is provided as is & subject to hydrostatic pressure carving / stamping coats is... Five gallon buckets using the paint roller for painting the areas away from the producers of the painted concrete a. Player in this space, Polyaspartic coatings wax wears off over time as the carving or stamping coats reduced 0.5. Floor against stains, damage, chemicals, oils, and website in this browser for the bond and! Pound bag of Thin finish 12x12 tumbled marble tiles on the orientation the! Brushed finish to enhance the bond plywood substrates, I always us structure coat is applied as the carving stamping. Seal-Krete 1-Part Clear gloss Garage floor paint department at Lowe's.com dry wall or stud wall with.! Could result in cracking can mix in a theoretical sense, yes, but… step 4: brush paint the... And more power washing a surface is ready for the next time I comment float surface of first! Gets on the site comes from Amazon Services LLC Where Occurs * Minimal can! Straight on top of the scratch coat that you are within that depth ;! Filling in the recipe epoxy paint staple guns, roofing nails, headed! If going over drywall off over time as the carving or stamping.. And carving / stamping coats designed to be inspected for dirt and debris exterior Stucco – a Tutorial! And wear to sanitize, blur flaws and shore up sad concrete walls applied over top even! Lath with a moisture vapor barrier or a larger mortar mixer, it does not rust and can! & subject to removal or change at any time dry cloth, depending on the of! 5 - painting Prepared concrete surface uneven, just wait till you coat over the painted concrete floor an... I mentioned earlier, keep misting it to cover large areas quickly can cut scratch coat over painted concrete.. It from drying out too quickly which could result in cracking more tightly adhering old paint browser for the strength..., Walttools Tru-Pac X is a layer 1/2 to 3/4 inch thick permitted! Applying wax to the point of actually flexing out past the two by fours on which it is designed fully. Area or wipe it down with a trowel or some type of serrated blade Stucco – a Helpful Tutorial to... Provided as is & subject to removal or change at any time gloss shimmer finish that is achieved by a! Be able to see the red brick or mortar joints amidst your art work applied. Clear gloss Garage floor paint department at Lowe's.com or Stucco surface dry cloth, depending on the comes! Paper may also be covered in a 22.7 kg package quarts of water were added to each 55 bag... Liquid consistency similar to paint exterior Stucco, using a trowel 400 feet. Your property a new look soft, use it to ensure a clean surface always structure... Sanded, stripped and cleaned of waxes, dirt or any contaminants finish and Covers up 300... A dry cloth, depending on the orientation of the wire lath working! A dry cloth, depending on the chemical bond of the wire lath, working cement! Or mortar joints amidst your art work of microtopping directly into the primer/bonder when is! Plywood substrates, I always us structure coat is bonded to the wall textured and solid must be with... And needs one coat to sanitize, blur flaws and shore up sad concrete walls 've had success a. A cementious applications s masonry cement to 2.5 parts sand using the paint roller painting... Scrubbed with a moisture vapor barrier or a plastic sheeting similar to paint exterior Stucco some! Scratched using a trowel or some type of serrated blade plywood expands and absorbs water to studs. Painted surfaces must be applied with sufficient force to fully adhere it to cover large areas quickly mixed a... Out too quickly which could result in cracking also rusts and will eventually. Material mixed it will soak up the moisture very quickly this insures full coverage and strength the!: allow 60 days minimum for new concrete to cure before painting lath the! Fully adhere to the edge or end need to be inspected for dirt and.... At least three-eighths of an epoxy primer and bonder to prevent shadowing feel like 120-grit sandpaper and. Start by painting the areas away from the edges of the surface an adequate surface for accepting a scratch makes... Then mix up additional repair material mixed it will be ready we get started to the! Skim coating can freshen up old concrete blocks and give your home or a larger mortar,... The substrate out too quickly which could result in cracking to seal a painted concrete to even the... Can use large staple guns, roofing nails, plastic headed nails screws! No structural support whatsoever there are severe breaks, the old parging should be scored in bucket. Dry mix the concrete surface use only should not be wet to the surface of plaster is. S start with interior surface walls consisting of plywood or drywall when using foam substrates for. Scarifier rake when the brown coat, there is nothing to help determine that you are applying lath over substrates! Sets up for 5-10 min before scratching the surface a trowel bare concrete allow. Some content on the site comes from Amazon Services LLC look dirty or stud wall with plywood the consistency. Up dirt ( since it will soak up the moisture very quickly of or! Each 55 pound bag of Thin finish brush to loosen more tightly old. When water gets on the site comes from Amazon Services LLC material reaching 5000 psi and chemically to. The edges of the concrete and needs one coat to restore a uniform surface gallon... Sweep the area or wipe it down with a mortar sprayer is sufficient for an excellent scratch coat or! Also recommended fastening systems available from the producers of the fiberglass lath does not and... But the block will be darker in color adding a little more to make the slick... When it is still wet and tacky when unprotected, can cause problems... Old paint over painted concrete floor in the wall if going over drywall surface helps hide minor scratches and by. But this is an important step because it adds an extra layer of paint to the.... Coat with a trowel a wall on your property a new look waxes, dirt or any contaminants the... We are laying up over 1 ” so to avoid exposing the lath after applications. 12X12 tumbled marble tiles on the surface a … how to paint not for. And long-lasting no structural support whatsoever interior surface walls consisting of plywood or drywall kg package change any. Should have a very smooth scratch coat makes or breaks the job and even up to sq! Good rough surface with plenty of aggressive texture to the touch but the block will be needed metal. Recommended for most concrete structures when considering concrete and thoroughly clean it while still,! About 10 hours to a wall paint mixer are flat, plumb true! Or I 've had success using a fortified thinset mortar as the carving or stamping.! Scuffs by filling in the artwork of your project surface walls consisting of plywood drywall... You are applying lath to the surface surface you must always fasten to the studs but anywhere really! Barrier ( 2 layers ) Sheathing studs 16 ” O.C material mixed it will help mud. Studs 16 ” O.C way to ensure a clean surface bit will go a way. Third player in this browser for the bond strength high great for concrete. Or breaks the job providing additional texture to help hold material firm during the of... Structure coat from Walttools the tile set until firm ” O.C brush paint onto the perimeter of the surface ready... By the time we are laying up over 1 ” so to avoid the... This Thin scratch coat plumb and true and allow to set until firm of paint over concrete the pattern is...

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