Mortar cannot be installed directly over painted concrete itself. 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. Scratch-coat plasters are scored or scratched to promote mechanical bond when the brown coat is applied. If you have a concrete sprayer, use it to cover large areas quickly. 2. It is designed to be used with metal lath over plywood substrates, for indoor use only. Mix the Thin Finish with your paint mixer (Image 1). 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 Otherwise, try picking up the stucco mix with a flat tool like a hawk and then transferring it to the wall with a trowel. You only need a thin coat. Easy peasy DIY concrete countertops over my laminate counters. 8. ​Keep Working You Way Down: Like I mentioned earlier, keep misting the wall as you go to keep the bond strength high. 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. 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. 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. 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. There is a big difference in preparing a cement wall vs. a dry wall or stud wall with plywood. They are both light reflective, easy to clean, and long-lasting. If there are severe breaks, the old parging should be removed and a completely new coat applied. Preferred Products for Vertical Decorative Concrete . Applying wax to the surface helps hide minor scratches and scuffs by filling in the scratch. 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. I figured concrete counters would fit those constraints. ​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. You don’t need to use as much water as you did the first time around, just enough to re-hydrate the wall again. Adding color during this step will provide a … Use the paint roller for painting the areas away from the edges. This does make the floor slick when water gets on the surface. Wear gloves and eye protection. When applying with a Mortar Sprayer there is no need to scarify the surface. Scratch coats are the bottom layer or coating of plaster that is applied to a wall. A common t-150 stapler will do just fine. Mix the concrete in clean five gallon buckets using the paint mixer. It should be at least three-eighths of an inch thick and permitted to dry a minimum of 24 hours. The alkali-resistant formula can be brushed, rolled, or sprayed onto concrete walls without worry. Let’s start with interior surface walls consisting of plywood or drywall. Step 5 - Painting Prepared Concrete Surface. Yes, but… The floor in the bathroom is roughly 40 square feet. Ie. It soaks easily into concrete and needs one coat to sanitize, blur flaws and shore up sad concrete walls. There are also recommended fastening systems available from the producers of the fiberglass lath. 4.) Then mix up additional repair material to the proper consistency and apply over this thin scratch coat. It works best if the mud sets up for 5-10 min before scratching the surface. ​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). Let’s take a look at some tips before we get started to make the process go a whole lot smoother. 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 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. Perfect! If concrete surface, concrete block, stucco, or other stone or brick has not been painted or waterproofed, no wire is necessary. More + … It’s applied straight on top of the laminate in troweled-on layers. Reviewers liked it for its ease of use and ability to keep out moisture. Apply a coat of an epoxy primer and bonder to prevent shadowing. Dry mix the sand and cement together and avoid creating clumps in the mixture. There are two types of lath. This is extremely important. Preferred Products for Vertical Decorative Concrete, Walttools Tru-Pac X – For Scratch Coats and Carving / Stamping Coats. Works on both interior and exterior painted, stained or bare concrete surfaces as a protective top-coat; Covers up to 300 sq. STEP 4: Brush paint onto the perimeter of the concrete. While still wet, this coat is scratched using a trowel or some type of serrated blade. The chips will provide a very small amount of non skid. 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. Scratch coats are the bottom layer or coating of plaster that is applied to a wall. When using foam substrates, I always us Structure Coat from Walttools. Apply a finish coat of integrally colored microtopping. You may need to add water a couple of times on hot days because it will soak up the moisture very quickly. This mix reaches 12,000 psi in and offers great flexural strength. ​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. DIY - Stucco, using Quickcrete Stucco Base/Scratch Coat and Bonding Adhesive. Apply the mortar to a … Thanks, steve 1. 8. Apply a 1 ⁄ 4 in (0.64 cm) scratch coat with a trowel. Concrete must be free of efflorescence and not subject to hydrostatic pressure. If, however, the first coat is also the last coat, you will want a smooth surface. Over exterior painted stucco, use 1-1/2" - 2” steel hardened concrete nails. When doing decorative ends or open ends do not allow the lath to go all the way to the edge or end. Mixing the Scratch Coat: 1 part Type S Masonry Cement to 2.5 parts sand. When installing the lath make sure you overlap the pieces by several inches. Fiberglass lath does not rust and you can cut fiberglass lath with a pair of scissors. Most of the time we are laying up over 1” of material and even  up to 3” – 4” of material. This mix is specifically designed to fully adhere to the foam and ensure a maximum bond. Concrete slabs should have a broomed or brushed finish to enhance the bond. Over exterior painted stucco, use 1-1/2" - 2” steel hardened concrete nails. A scratch coat will be needed when metal lath is used. Another option is to mix colored concrete pigment into your wheelbarrow of wet cement to give it some color. TI Flexy-Bo is a concentrated re-emulsifiable co-polymer solution designed as a primer for overlayments such as Walttools Over-Eze,Tru-Pac X & V vertical overlay, and standard underlayments. Once the acid is thoroughly rinsed away and the surface is completely dry, a fresh coat of paint or concrete stain can be applied. Bonders Whats the best thing to do. This is a thinner mixture than the Texture Pave below and will be approximately one-eighth of an inch thick. Float surface of the scratch coat plumb and true and allow to set until firm. To achieve this smooth appearance, apply a thicker coat of mortar, then apply a thinner coat on top of the first application. 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. Apply the second coat … If you have a concrete sprayer, use it to cover large areas quickly. Fiberglass Lath and Metal Lath. A damaged or uneven area can also be covered in a metal armature, with parging applied over top to even out the surface. 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. You should keep the lath back 1” so to avoid exposing the lath after final applications of mud are applied. ​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. Cement can be painted over by coating it with a concrete primer. Techniques such as blending two to three colors by either spraying or rag painting are the most likely to disguise the resurfacing of new color treatment over any remaining old paint and to last a few seasons. This is achieved by using a. 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. Apply a scratch coat of microtopping directly into the primer/bonder when it is still wet and tacky. 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. This is achieved by using a scarifier rake when the material is very soft. Use a bigger paintbrush for this. In a theoretical sense, yes, you can apply concrete stain over a painted concrete floor or wall. 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. Tru-Pac X is a fantastic scratch coat material reaching 5000 psi and chemically bonding to itself in later applications. It works best if the mud sets up for 5-10 min before scratching the surface. 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 plaster must be applied with sufficient force to fully adhere it to the masonry. The same mortar used for this scratch coat can also be used for the bond coat and also for grouting the seams. Power washing a surface is a good way to ensure a clean surface. Metal lath is difficult to work with, particularly having many sharp edges from cutting it. For non-foam scratch coats the best product is actually the same as the carving or stamping coats. This step only requires stapling. Let the finish coat cure 24 hours, and then seal the floor. How To Paint Exterior Stucco, Some Helpful Tips. 2.) Both sub straights, when unprotected, can cause many problems. I have even said a scratch coat makes or breaks the job. Suitable for use on interior/exterior concrete surfaces. I'm using 12x12 tumbled marble tiles on the floor. This step is not necessary when applying stone veneer to a cleaned concrete, masonry, or stucco surface. The concrete can be scraped or scrubbed with a brush to loosen more tightly adhering old paint. This can be a house wrap or similar product as long as moisture cannot pass through. You are completely relying on the chemical bond of the products to hold fast to the wall. Resurfacing involves applying a thin parging coat to restore a uniform surface. Prepare Brick Surface: Sand- or water-blast the paint, dirt, or oils so that you have a raw, fresh, porous (but not crumbling) surface. How to Seal a Painted Concrete Floor. Easy peasy DIY concrete countertops over my laminate counters. I say this because in vertical decorative concrete, contractors must lay up a lot more than a regular plaster application. The floor will quickly pick up dirt (since it will not be smooth) and very soon your coated surface will look dirty. Here are the steps to follow to protect common areas like drywall and plywood. Apply a coating of latex bonding agent over the floor to help the leveler adhere to the painted concrete. 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 … This is extremely important. at paving when paving is supported by same foundation as wall. Metal Lath Mortar Water Resistant Barrier (2 Layers) Sheathing Studs 16” O.C. The scratch coat is a layer of wet concrete mixed to a liquid consistency similar to paint. Metal lath also rusts and will can eventually cause problems in the structure or in the artwork of your project. Glossy or painted surfaces must be sanded, stripped and cleaned of waxes, dirt or any contaminants. 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. Shop Seal-Krete 1-Part Clear Gloss Garage Floor Epoxy (Gallon) in the Garage Floor Paint department at Lowe's.com. Apply a second and final coat of paint to the concrete. It does not flex out but rather just deteriorates and offers no structural support whatsoever. 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. However, that stain will not take hold of the painted surface at all, leading to a suboptimal coating that may not protect the painted surface beneath. It’s applied straight on top of the laminate in troweled-on layers. When using a liquid bonding agent, paint the bonder onto the existing concrete and allow it to dry until it is tacky. Let the scratch coat dry 24 hours. Step 5 - Painting Prepared Concrete Surface. This usually takes only a few minutes. 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. Cover the entire area of the lath, working the cement into the holes and scraping off any excess. From what I’ve read, a concrete skim-coat would transform my laminate without having to remove or rebuild the counters. Allow the first coat of paint to dry for about 10 hours. 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 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. ​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. Allow the first coat of paint to dry for about 10 hours. Use a bigger paintbrush for this. The thinset sticks well to the paint. Save my name, email, and website in this browser for the next time I comment. Metal lath is difficult to work with, particularly having many sharp edges from cutting it. 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. If you think that the concrete substrate looks uneven, just wait till you coat over with epoxy paint. Scratch coats are particularly important in the world of vertical decorative concrete. LATHING (Wire): Over painted concrete block you should use 3/4" steel hardened concrete nails. A rich mix is simply adding a little more Portland cement in the recipe. Start by painting the edges of the concrete surface. You can use large staple guns, roofing nails, plastic headed nails and screws. Use the paint roller for painting the areas away from the edges. You can use large staple guns, roofing nails, plastic headed nails and screws. I figured concrete counters would fit those constraints. If you are applying lath over plywood you still want to target the studs but anywhere is really good. One applied properly you have a very solid seamless surface. As you make your way down the wall, keep misting it to ensure that it is retaining enough moisture. 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. Apply the scratch coat of mortar on top of the wire lath, masonry or concrete. Let the scratch coat dry 24 hours. A scratch coat will give the mortar something to hold on to, instead of the layer of paint over concrete. You can use a depth gauge to help determine that you are within that depth. Layer on a thickness of about a half inch. ​You can mix in a bucket, a wheelbarrow or a larger mortar mixer, it doesn't really matter which method you use. These types of walls simply need to be inspected for dirt and debris. Apply the scratch coat of mortar on top of the wire lath, masonry or concrete. I wouldn’t go as far as a 2 to 1 ratio, just a little more to make it adhere better. The non skid is applied as the chips are applied into the base coat epoxy, thus providing additional texture to the surface. Some masons say that this is an adequate surface for accepting a scratch coat. It should be at least three-eighths of an inch thick and permitted to dry a minimum of 24 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. Now my question is should I use a wire mesh and scratch coat(and no i will not use that new plastic stuff) with my tiles. Then allow the scratch coat to cure for 24 hours. The pattern that is achieved with the mortar sprayer is sufficient for an excellent scratch coat. [16] The acid wash loosens paint that does not fully adhered to the concrete surface. LATHING (Wire): Over painted concrete block you should use 3/4" steel hardened concrete nails. Walttools Tru-Pac X – For Scratch Coats and Carving / Stamping Coats . 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). 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. Copyright 2020 by The Stucco Guy - Info On Repair, Contractors, DIY, Textures, Colors And More. There are also recommended fastening systems available from the producers of the fiberglass lath. If you are applying a scratch coat, you need not worry about keeping the surface smooth. 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. 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. 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. As such, a stain-over-paint procedure is not recommended for most concrete structures. 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. 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. Add 5.5 quarts of water for each 55-pound bag of Thin Finish. Metal lath also rusts and will can eventually cause problems in the structure or in the artwork of your project. Secure the surface with a moisture vapor barrier or a plastic sheeting. On two-coat work, only the base coat is bonded to the substrate. 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. This requires a good rough surface with plenty of aggressive texture to help hold material firm during the application process. First, a surface more textured and solid must be applied over the painted concrete. 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. It is provided as is & subject to removal or change at any time. | Some content on the site comes from Amazon Services LLC. This surface is called a scratch coat. Combine the concrete in a ratio of about 1 part water to 7 parts concrete, then mix it with a wooden mixing stick or electric paddle mixer until it reaches a uniform liquid consistency. Let the finish coat cure 24 hours, and then seal the floor. Metal Lath Treated CMU or Concrete Rebar Where Occurs *Minimal distance can be reduced to 0.5 in. 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. It is not necessary for this scratch coat to dry. Once you clear coat over the top of the chips it seals them in and puts the shiny gloss coating over them. 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. 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. It should not be wet to the touch but the block will be darker in color. Repairing Hairline Cracks In Exterior Stucco – A Helpful Tutorial! 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. Yes, but… Lime would also help to make the mix a bit stickier and just a little bit will go a long way. Concrete must be cured 28 days and accept water penetration. If you are applying lath over plywood you still want to target the studs but anywhere is really good. © Contractor Source, LLC. And it is inexpensive. But this is just a temporary fix since wax wears off over time as the countertops get cleaned. Apply a coat of an epoxy primer and bonder to prevent shadowing. Apply the second coat after the interval. Bare concrete: Allow 60 days minimum for new concrete to cure before painting. The process involves applying a layer of cement over … Foam Core Construction and Foam Sub Straights. For non-foam scratch coats the best product is actually the same as the carving or stamping coats. 1.) 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. The client will then be able to see the red brick or mortar joints amidst your art work. How long will this last? The scratch coat should be scored in a horizontal direction; shallow scratching is adequate. Apply a scratch coat of microtopping directly into the primer/bonder when it is still wet and tacky. 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.

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