How to Scratch Coat When Using Cultured Stone Wall Surface How to Scratch Coat When Using Cultured Stone Wall Surface

What You'll Need
Scratch Coat Mixture
Water
Machine Sprayer
Trowel
Bucket
Drop Cloth
Safety Glasses
Mask

You can use a scratch coat when using a cultured stone wall surface in the same way that you apply a scratch coat to any other type of wall surface. A scratch coat is a plaster bottom layer that is applied to an exterior or interior wall of a home during the renovation or remodel of a home. The process for applying the scratch coat takes place before the cultured stone wall surface is applied so this article will focus on the scratch coat application process before the cultured stone wall surface is applied.

If you are considering putting a scratch coat on a wall prior to laying a cultured stone wall surface, here are the tools, materials and steps needed. The process for using a scratch are described in the ASTM International voluntary code standards that are found in many local building codes.

Step 1: Purchase Materials for Scratch Coat

A local home improvement store or other retailer in your community that sells home improvement materials should have the supplies needed for the application of the scratch coat. You will need to rent or buy a machine sprayer if you do not want to manually apply the scratch coat to the wall. The machine sprayer will make the job easier to accomplish, especially if you are doing an exterior cultured stone wall surface. 

Step 2: Prepare the Area for the Scratch Coat

Cover any plants or other objects that cannot be removed from near the wall surface. You want to also make sure that any imperfections in the wall are removed prior to applying the scratch coat to the wall surface. Wear protective clothing, a breathing mask and goggles when working with the machine sprayer. You should consider wearing goggles if you plan to manually apply the scratch coat to the wall surface in order to prevent any of the material from splashing on your eyes.

Step 3: Apply the Scratch Coat to the Wall

Using the machine sprayer, spray the wall surface with even steady strokes. This will ensure a uniform application of the spray coat to the walls and provide the best coverage prior to the installation of the cultured stone wall surface. Be sure to go over the wall surface as completely as you can before you move on to the next step of the process.

Step 4: Check the Application of the Scratch Coat

Once the scratch coat application has dried, check the wall to see that all spots have been filled. If necessary, use the machine sprayer to fill in and areas that have not been covered in the initial application of the spray coat. Once you have completed the reapplication of the scratch coat you are ready to begin the installation of the cultured stone wall surface.

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