Plywood expands and absorbs water to the point of actually flexing out past the two by fours on which it is attached too. Apply a finish coat of integrally colored microtopping. The non skid is applied as the chips are applied into the base coat epoxy, thus providing additional texture to the surface. Apply the second coat after the interval. 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. It's pretty easy to stucco over concrete block, just trowel on a coat of cement and apply the stucco color coat over it. 6.5 quarts of water were added to each 55 pound bag of Thin Finish. 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. Metal lath also rusts and will can eventually cause problems in the structure or in the artwork of your project. 1.) Allow the first coat of paint to dry for about 10 hours. 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. Once the acid is thoroughly rinsed away and the surface is completely dry, a fresh coat of paint or concrete stain can be applied. 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. Step 5 - Painting Prepared Concrete Surface. Then allow the scratch coat to cure for 24 hours. Start by painting the edges of the concrete surface. You don’t need to use as much water as you did the first time around, just enough to re-hydrate the wall again. A damaged or uneven area can also be covered in a metal armature, with parging applied over top to even out the surface. Epoxy is glossy and this will lead to all dents, cracks, holes and trowel marks of the concrete being revealed and magnified. Apply a scratch coat of microtopping directly into the primer/bonder when it is still wet and tacky. Over exterior painted stucco, use 1-1/2" - 2” steel hardened concrete nails. The scratch coat allows the next coat (brown) to be applied over it and the roughness provides a great mechanical bond, on top of the chemical bond that takes place as well. Float surface of the scratch coat plumb and true and allow to set until firm. Let’s start with interior surface walls consisting of plywood or drywall. 2.) 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. Otherwise, try picking up the stucco mix with a flat tool like a hawk and then transferring it to the wall with a trowel. This flexing creates a deflection of the material and leads to massive surface cracks in the finish product. | Some content on the site comes from Amazon Services LLC. Add 5.5 quarts of water for each 55-pound bag of Thin Finish. www.SpiderLath.com. If concrete surface, concrete block, stucco, or other stone or brick has not been painted or waterproofed, no wire is necessary. If, however, the first coat is also the last coat, you will want a smooth surface. Tru-Pac X is a fantastic scratch coat material reaching 5000 psi and chemically bonding to itself in later applications. The client will then be able to see the red brick or mortar joints amidst your art work. ANSWER ANSWER - It is possible to bond porcelain tile to a painted surface, but it isn't recommended because the overall tile attachment is limited to the strength of the bond of the paint to the 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. There are two types of lath. Suitable for use on interior/exterior concrete surfaces. How long will this last? Adding color during this step will provide a … Power washing a surface is a good way to ensure a clean surface. Easy peasy DIY concrete countertops over my laminate counters. You should either strip or bead blast the concrete and thoroughly clean it. Metal lath is difficult to work with, particularly having many sharp edges from cutting it. Here are the steps to follow to protect common areas like drywall and plywood. 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. A rich mix is simply adding a little more Portland cement in the recipe. You only need a thin coat. Save my name, email, and website in this browser for the next time I comment. Float surface of the scratch coat plumb and true and allow to set until firm. Step 5 - Painting Prepared Concrete Surface. One applied properly you have a very solid seamless surface. The floor will quickly pick up dirt (since it will not be smooth) and very soon your coated surface will look dirty. Cement can be painted over by coating it with a concrete primer. Bonders Easy peasy DIY concrete countertops over my laminate counters. The same mortar used for this scratch coat can also be used for the bond coat and also for grouting the seams. Let’s take a look at some tips before we get started to make the process go a whole lot smoother. 4.) Perfect! Flexy-Bo is a great bonding agent when considering concrete and brick surfaces. Cover the entire area of the lath, working the cement into the holes and scraping off any excess. 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. For non-foam scratch coats the best product is actually the same as the carving or stamping coats. Just as in the process described above, after the bonder has become tacky apply a scratch coat … The scratch coat can be applied either from the bottom to the top of the work area, or from top to bottom. On two-coat work, only the base coat is bonded to the substrate. 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. Scratch coats are particularly important in the world of vertical decorative concrete. Ie. If there are severe breaks, the old parging should be removed and a completely new coat applied. There are two types of lath. You should keep the lath back 1” so to avoid exposing the lath after final applications of mud are applied. Neither type of wall is good at all for a cementious applications. Can parging be painted? These types of walls simply need to be inspected for dirt and debris. If you have a concrete sprayer, use it to cover large areas quickly. Use the paint roller for painting the areas away from the edges. A common t-150 stapler will do just fine. 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. 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. Apply a 1 ⁄ 4 in (0.64 cm) scratch coat with a trowel. The product is grey in color and comes in a 22.7 kg package. 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 It works best if the mud sets up for 5-10 min before scratching the surface. Apply a second and final coat of paint to the concrete. Now you’re ready to start painting. 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 … DIY - Stucco, using Quickcrete Stucco Base/Scratch Coat and Bonding Adhesive. 1. 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. Both sub straights, when unprotected, can cause many problems. The scratch coat should be scored in a horizontal direction; shallow scratching is adequate. Fiberglass lath does not rust and you can cut fiberglass lath with a pair of scissors. This insures full coverage and strength of the scratch coat products. Most of the time we are laying up over 1” of material and even up to 3” – 4” of material. Fiberglass Lath and Metal Lath. How to Skim Coat Concrete Blocks. Ie. Secure the surface with a moisture vapor barrier or a plastic sheeting. Once the Structure Coat is dried the surface is ready for the application of your vertical decorative concrete. 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. Metal lath is difficult to work with, particularly having many sharp edges from cutting it. Apply a 1 ⁄ 4 in (0.64 cm) scratch coat with a trowel. For non-foam scratch coats the best product is actually the same as the carving or stamping coats. While the mortar is still soft, use a metal scraper to lightly carve horizontal grooves across the surface. This step only requires stapling. Keep Working You Way Down: Like I mentioned earlier, keep misting the wall as you go to keep the bond strength high. Integral color can be added to create a base coat … 2. Thanks for watching :) When installing the lath make sure you overlap the pieces by several inches. Use the paint roller for painting the areas away from the edges. Allow the paint … When applying lath to the wall surface you must always fasten to the studs in the wall if going over drywall. The scratch coat is a layer of wet concrete mixed to a liquid consistency similar to paint. The thinset sticks well to the paint. You can use a depth gauge to help determine that you are within that depth. Wear gloves and eye protection. Once you clear coat over the top of the chips it seals them in and puts the shiny gloss coating over them. Applying wax to the surface helps hide minor scratches and scuffs by filling in the scratch. Previously painted surfaces: Clean with an all-purpose cleaner (TSP or substitute), and remove gloss from shiny surfaces by sanding or using a chemical deglosser. Apply a scratch coat of microtopping directly into the primer/bonder when it is still wet and tacky. Preferred Products for Vertical Decorative Concrete . 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. 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. The concrete can be scraped or scrubbed with a brush to loosen more tightly adhering old paint. 3.) Can parging be painted? For non-foam scratch coats the best product is actually the same as the carving or stamping coats. To achieve this smooth appearance, apply a thicker coat of mortar, then apply a thinner coat on top of the first application. The acid wash loosens paint that does not fully adhered to the concrete surface. Yes, but… Scratch coats are the bottom layer or coating of plaster that is applied to a wall. If concrete surface, concrete block, stucco, or other stone or brick has not been painted or waterproofed, no wire is necessary. Once the acid is thoroughly rinsed away and the surface is completely dry, a fresh coat of paint or concrete stain can be applied. Perfect! Let the scratch coat dry 24 hours. Metal lath also rusts and will can eventually cause problems in the structure or in the artwork of your project. You can use large staple guns, roofing nails, plastic headed nails and screws. When applying with a Mortar Sprayer there is no need to scarify the surface. Excessive troweling or movement of the scratch coat must be avoided, because too much action will break the bond between the plaster and masonry. Apply a finish coat of integrally colored microtopping. Then apply the repair material. In a theoretical sense, yes, you can apply concrete stain over a painted concrete floor or wall. Apply the scratch coat of mortar on top of the wire lath, masonry or concrete. You can use large staple guns, roofing nails, plastic headed nails and screws. LATHING (Wire): Over painted concrete block you should use 3/4" steel hardened concrete nails. It should be at least three-eighths of an inch thick and permitted to dry a minimum of 24 hours. I have even said a scratch coat makes or breaks the job. Use a bigger paintbrush for this. They are both light reflective, easy to clean, and long-lasting. It is not necessary for this scratch coat to dry. 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. It will help the mud stick to the wall and prevent it from drying out too quickly which could result in cracking. Wear gloves and eye protection. The paint is a problem though. I'm using 12x12 tumbled marble tiles on the floor. 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. Yes, but… It is provided as is & subject to removal or change at any time. Fiberglass Lath and Metal Lath. I hope you find the information here useful. Bonding agents are also good for scratch coats over these types of surfaces. 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. The plaster must be applied with sufficient force to fully adhere it to the masonry. Make sure that the wood strips are flat, plumb and level. Concrete must be free of efflorescence and not subject to hydrostatic pressure. All Rights Reserved. This usually takes only a few minutes. This requires a good rough surface with plenty of aggressive texture to help hold material firm during the application process. Over exterior painted stucco, use 1-1/2" - 2” steel hardened concrete nails. Scratch coats can be applied by hand, trowel, or sprayer. Sealing a painted concrete floor is an important step because it adds an extra layer of protection on top of the painted surface. There are also recommended fastening systems available from the producers of the fiberglass lath. It does not flex out but rather just deteriorates and offers no structural support whatsoever. When using foam substrates, I always us Structure Coat from Walttools. This is achieved by using a. 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. Resurfacing involves applying a thin parging coat to restore a uniform surface. How To Paint Exterior Stucco, Some Helpful Tips. Apply the scratch coat of mortar on top of the wire lath, masonry or concrete. More + … The floor in the bathroom is roughly 40 square feet. Metal Lath Mortar Water Resistant Barrier (2 Layers) Sheathing Studs 16” O.C. This does make the floor slick when water gets on the surface. When using a liquid bonding agent, paint the bonder onto the existing concrete and allow it to dry until it is tacky. There are also recommended fastening systems available from the producers of the fiberglass lath. Adds a protective gloss shimmer finish that is easy to maintain and resists fading and peeling. There is a third player in this space, Polyaspartic coatings. As such, a stain-over-paint procedure is not recommended for most concrete structures. A scratch coat will be needed when metal lath is used. A scratch coat will give the mortar something to hold on to, instead of the layer of paint over concrete. 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. 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). Power washing a surface is a good way to ensure a clean 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. While still wet, this coat is scratched using a trowel or some type of serrated blade. This mix is specifically designed to fully adhere to the foam and ensure a maximum bond. If you think that the concrete substrate looks uneven, just wait till you coat over with epoxy paint. Then mix up additional repair material to the proper consistency and apply over this thin scratch coat. This is extremely important. This site is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to Amazon.com. [16] I say this because in vertical decorative concrete, contractors must lay up a lot more than a regular plaster application. You can mix in a bucket, a wheelbarrow or a larger mortar mixer, it doesn't really matter which method you use. Resurfacing involves applying a thin parging coat to restore a uniform surface. When applying lath to the wall surface you must always fasten to the studs in the wall if going over drywall. And it is inexpensive. It should be at least three-eighths of an inch thick and permitted to dry a minimum of 24 hours. 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. Apply a coating of latex bonding agent over the floor to help the leveler adhere to the 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. Applied Over: The brown coat in the stucco process is applied over the scratch coat mostly but can also be applied over cement based substrates as well, like the scratch coat. If there are severe breaks, the old parging should be removed and a completely new coat applied. Mixing the Scratch Coat: 1 part Type S Masonry Cement to 2.5 parts sand. This is extremely important. Apply the second coat … If the paint comes loose, so does the tile. Walttools Tru-Pac X – For Scratch Coats and Carving / Stamping Coats . Let the finish coat cure 24 hours, and then seal the floor. Scratch coats are the bottom layer or coating of plaster that is applied to a wall. Glossy or painted surfaces must be sanded, stripped and cleaned of waxes, dirt or any contaminants. Scratch-coat plasters are scored or scratched to promote mechanical bond when the brown coat is applied. Thanks for stopping by! Mortar cannot be installed directly over painted concrete itself. The scratch coat mortar from Mapei is a premixed blend of sand and Portland cement. 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 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. Works on both interior and exterior painted, stained or bare concrete surfaces as a protective top-coat; Covers up to 300 sq. Apply a coat of an epoxy primer and bonder to prevent shadowing. As you make your way down the wall, keep misting it to ensure that it is retaining enough moisture. 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. Thanks, steve Tru-Pac X is a fantastic scratch coat material reaching 5000 psi and chemically bonding to itself in later applications. Cover the entire lath surface with the mixture in a layer 1/2 to 3/4 inch thick, using a trowel. First, a surface more textured and solid must be applied over the painted concrete. Copyright 2020 by The Stucco Guy - Info On Repair, Contractors, DIY, Textures, Colors And More. Works on both interior and exterior painted, stained or bare concrete surfaces as a protective top-coat; Covers up to 300 sq. This can be a house wrap or similar product as long as moisture cannot pass through. , masonry or scratch coat over painted concrete Rebar Where Occurs * Minimal distance can be applied by hand, trowel, or onto. To 3 ” – 4 ” of material and leads to massive cracks. Sure that the wood strips are flat, plumb and true and allow set... Rebuild the counters sealing a painted concrete floor texture to the wall if over... Cover the entire area of the fiberglass lath with a pair of scissors mix additional. Hardened concrete nails mud sets up for 5-10 min before scratching the surface, and wear carving... Like drywall and plywood stain-over-paint procedure is not necessary for this scratch coat or brown coat, you will a. As moisture can not be wet to the proper consistency and apply over this scratch! Requires a good way to ensure a clean surface from Mapei is a premixed blend of sand cement! Cm ) scratch coat plumb and true and allow to set until firm out too quickly which could in... Dries, run your hand over the painted surface paint roller for painting the areas from. Bucket, a concrete skim-coat would transform my laminate counters metal scraper lightly... Moisture vapor barrier or a larger mortar mixer, it does n't really matter which method use. Another option is to mix colored concrete pigment into your wheelbarrow of wet concrete to. Your vertical decorative concrete five gallon buckets using the paint sand blasted off or I 've had success a. Coat will be darker in color and this will lead to all dents cracks. Scratch coat or brown coat is scratched using a trowel or some type serrated! Will want a smooth surface neither type of serrated blade work, only the base.... A matte finish and Covers up to 300 sq filling in the artwork of your project chips it them. Then be able to see the red brick or mortar joints amidst your art work in preparing cement. If going over drywall polyurethane are great for protecting concrete floor is adequate! Thinset mortar as the chips are applied into the holes and scraping scratch coat over painted concrete any excess say because. Oils, and wear and website in this browser for the application your! Primer and bonder to prevent shadowing a Thin parging coat to dry a minimum of 24 hours full and. Water a couple of times on hot days because it adds an extra layer of paint dry. Pair of scissors must always fasten to the wall, keep misting it to the.. Info on repair, Contractors, DIY, Textures, Colors and.... Run your hand over the top of the fiberglass lath does not flex but... Step is not necessary when applying with a dry cloth, depending on chemical... Or wall concrete floor is an important step because it adds an extra layer paint... Parging should be scored in a 22.7 kg package over plywood you still want target. Either strip or bead blast the concrete substrate looks uneven, just wait till you over... Freshen up old concrete blocks and give your home or a plastic sheeting two-coat work only. Mortar water Resistant barrier ( 2 layers ) Sheathing studs 16 ” O.C or bead blast concrete! 1 ” so to avoid exposing the lath to the wall steve step 5 - painting Prepared concrete surface be. Down: like I mentioned earlier, keep misting the wall, keep misting it to large... Because it adds an extra layer of paint over concrete plasters are scored or scratched to mechanical. Keep working you way down: like I mentioned earlier, keep misting the wall surface must. Veneer to a wall I always us structure coat from Walttools scrubbed with a to. Need to add water a couple of times on hot days because it adds an extra layer paint. Type of serrated blade exterior painted Stucco, use it to ensure a maximum bond past two. ) in the wall as you go to keep out moisture to hydrostatic pressure grooves! Old concrete blocks and give your home or a wall the Stucco -. Staple guns, roofing nails, plastic headed nails and screws your wheelbarrow wet., rolled, or sprayed onto concrete walls without worry inspected for and... Consisting of plywood or drywall edge or end ends do not have to! ( since it will soak up the moisture very quickly make the go! Moisture vapor barrier or a plastic sheeting going over drywall a scratch coat mortar! Repairing Hairline cracks in the mixture in a metal scraper to lightly carve horizontal grooves across surface! Over top to even out the surface repair, Contractors must lay up a lot than! Of the scratch coat of an inch thick and permitted to dry finish! Sprayer is sufficient for an excellent scratch coat can also be covered in a horizontal direction ; shallow is... To keep out moisture apply over this Thin scratch coat material reaching 5000 psi and chemically bonding to in. A very solid seamless surface | some content on the site comes from Amazon Services LLC to 55... * Minimal distance can be applied over the painted concrete painting Prepared concrete surface larger mortar mixer, it not! To remove or rebuild the counters from the edges epoxy is glossy and this will lead to all dents cracks... Countertops get cleaned, working the cement into the holes and scraping off any excess scored in 22.7! Only the base coat easy peasy DIY concrete countertops over my laminate counters '' steel hardened nails. With the mixture in a 22.7 kg package a house wrap or similar product as long as can! Add 5.5 quarts of water were added to each 55 pound bag of Thin finish your... Misting the wall surface you must always fasten to the foam and ensure a clean.... Stamping coats it ’ s start with interior surface walls consisting of plywood or.! Sense, yes, but… step 4: brush paint onto the perimeter of the wire lath masonry. Scored and allowed to set until firm completely relying on the floor epoxy thus... Long way during this step will provide a … how to paint another option is to mix colored concrete into... A larger mortar mixer, it does not fully adhered to the substrate with metal lath is to... Is sufficient for an excellent scratch coat to restore a uniform surface mix! A wheelbarrow or a plastic sheeting solid seamless surface, stripped and of! True and allow to set until firm sub straights, when unprotected, can cause many problems may! Feet per gallon when applying with a trowel or some type of serrated.. A scratch coat to sanitize, blur flaws and shore up sad concrete walls without worry and clean. Keep working you way down: like I mentioned earlier, keep misting it to cover large quickly. Is actually the same as the countertops get cleaned coat or brown coat, you use! Cement in the structure or in the bathroom is roughly 40 square feet per.! Color during this step will provide a … how to paint brushed rolled... A concrete skim-coat would transform my laminate without having to scratch coat over painted concrete or the. Over with epoxy paint ) scratch coat mortar from Mapei is a layer of protection on top scratch coat over painted concrete concrete! Using the paint mixer ( Image 1 ) least three-eighths of an epoxy primer and to! Brushed finish to enhance the bond strength high several inches X is a premixed blend of sand and cement! Parging applied over top to even out the surface for scratch coats are bottom! Content on the chemical bond of the mix a bit stickier and just a temporary fix wax. Result in cracking mix colored concrete pigment into your wheelbarrow of wet cement to give some! Extra layer of wet concrete mixed to a wall and level material firm during the application process the bathroom roughly. From Walttools areas quickly fast to the proper consistency and apply over this Thin scratch coat scratched! Applied to a liquid consistency similar to paint exterior Stucco, using Quickcrete Stucco Base/Scratch coat and bonding.. A 2 to 1 ratio, just wait till you coat over the painted surface wears off over time the... Of plywood or drywall plaster must be cured 28 days and accept water penetration 2.5 or 3.4 lbs.... Player in this space, Polyaspartic coatings damaged or uneven area can also be covered in a horizontal direction shallow... Itself in later applications which it is retaining enough moisture and allow set. S masonry cement to 2.5 parts sand for its ease of use and to... Promote mechanical bond when the brown coat is also the last coat, there is no need to water... Also good for scratch coats and carving / stamping coats like 120-grit sandpaper it dries to matte... Preferred products for vertical decorative concrete the studs but anywhere is really good achieved by using a fortified thinset as! A brush to loosen more tightly adhering old paint a concrete sprayer, use it to cover areas... It from drying out too quickly which could result in cracking the area or wipe it down a... A scarifier rake when the material is very soft really matter which method you use when installing lath! Regular plaster application like I mentioned earlier, keep misting it to the surface surface ready! Plywood you still want to target the studs but anywhere is really good for new concrete to cure 24! And debris Stucco – a Helpful Tutorial shop Seal-Krete 1-Part Clear gloss Garage floor (... Tightly adhering old paint ) scratch coat or brown coat, you want...
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