Preparation of the surface for plastering

It is crucial to make sure the surface is adequately prepared before plastering. To achieve a polished, long-lasting finish that will not fade, this step is essential.

The surface must be cleaned, leveled, and occasionally primed during the process. To ensure that the plaster adheres well and looks even, each step is crucial.

We’ll walk you through the fundamentals of surface preparation in this guide, so you can steer clear of typical blunders and achieve the best possible plastering project outcomes.

Surface Type Preparation Steps
Concrete Clean the surface of dust and debris, remove any loose particles, and apply a primer to ensure proper adhesion.
Brick Brush off loose mortar and dust, fill in any large gaps, and use a bonding agent to help the plaster adhere.
Drywall Ensure joints are properly taped and sanded, apply a primer, and check for any imperfections that need to be smoothed out.
Old Plaster Remove any damaged or loose plaster, sand the surface to create a rough texture, and apply a bonding agent if needed.
Wood Make sure the wood is dry, sand it to create a rough texture, and apply a special primer to help the plaster stick.

Why is it necessary to prepare the building base?

Plastering requires a surface preparation step before the material is applied to the building base. Regardless of the kind of finishing agent used, the process is executed.

Enhancing the material’s adherence to the building base is the primary goal of surface preparation for plastering. Because of this, the solution is simple to apply to the walls, which is crucial for amateurs who restore the interior or exterior of the building themselves.

Increasing the operational time for finishing is another objective of setting up the construction base.The materials stay firmly on the surface for a considerable amount of time because of this manipulation. The mortar and the remaining finish will come off if at least one part of the building base is not adequately prepared. Additionally, this may cause the plaster to swell and mold or fungus to grow beneath the coating. It is not advised to disregard this process as a result.

Plastering requires careful surface preparation to be successful. To guarantee that the plaster adheres properly and lasts a long time, the wall must be cleaned, leveled, and primed. If these procedures are skipped, the plaster may eventually require expensive repairs due to cracking, peeling, or improper bonding.

Surface cleaning

First, surfaces need to be prepared for plastering by taking off the previous layer. It is advised to take out any outdated plaster, paint, tiles, wallpaper, or whitewash. If the solution is applied over an existing coating, the old material will eventually come off with the new material.

The building base should then be cleaned. The ceiling and walls’ material are irrelevant in this situation. Cleaning is advised for any kind of surface. The building base is stripped of its previous coating, cleaned with cold water, and allowed to air dry.

Next, eliminate oil and grease-based stains, as these accumulations exacerbate the material’s adherence to the surface. Use white spirit, acetone, solvent, or gasoline for this. You can use folk remedies to get rid of these stains. You’ll need greasy clay for this. This mass is applied thickly over problem areas. The product is taken out once the material solidifies. Greasy stains are absorbed by clay, leaving the surface spotless after the product is removed.

The building base is then cleared of any mold and fungus that may have grown on the surface. Antiseptic solutions are used to treat the affected areas in order to achieve this. After that, pause to allow the surface to dry.

Preparation for application of the material of various types of bases

The type of building base material will determine the next step in surface preparation for plastering.

Concrete surface

Concrete has a shiny, smooth surface. On a surface like this, alterations and flaws are uncommon if the house is new. Even so, though, the base must be ready for plaster application. The porosity of concrete is insufficient to guarantee good material adhesion. Improving surface adhesion is advised in order for the plaster to lie on the base. This can be accomplished in a few ways:

  • Making notches. To ensure that the material adheres well to the surface, it is recommended to get rid of the smoothness of the base. To do this, use a chisel, hammer, drill and other similar tools. Notches are made along the perimeter of the surface, as in the photo below.
  • Grinding. A circle with a metal brush is fixed to the grinding machine and the construction base is processed with the tool.
  • Surface reinforcement. A chain-link mesh is fixed to the base using dowels. You can also fix a plastic or fiberglass mesh to the surface.

Brickwork

The first step in plastering a stone surface is to remove any fragments that are not securely fastened to the base. Use a hammer to tap the wall to accomplish this. This spot is tapped very carefully if the material starts to come off. The flaws then become deeper and more extensive.

Cleaning the surface is the next step. Along with greasy and oily stains, dirt and dust must be removed. It is advised to use White Spirit, solvent, gasoline, or any other degreasing agent to treat the base in order to achieve this.

According to the instructions for creating a brick base, a primer is applied after the surface has been cleaned and allowed to dry. Two layers of primer are applied, with a pause for drying in between. Particular care is taken when handling defects. After that, plaster mortar is used to cover the cracks, and the composition is allowed to harden. After that, the base is covered with the material.

The base is reinforced in advance if a thick layer of plaster is applied. Self-tapping screws or mortar are used to secure the mesh.

Wooden base

Low strength and high porosity characterize the wooden surface. Such a base cannot be plastered without first being prepared. The substance won’t stick to the surface very well. The plaster will not stick to the base firmly because of the way the wood is made. Because of this, the surface needs to be reinforced with reinforcement before the material is applied. Use wooden slats or plaster mesh for this.

Self-tapping screws are advised for fastening the material. If a mesh with tiny cells is utilized, plaster mortar is applied thinly to secure it. Nails are used to fasten wooden slats to the base. Plastering is done following surface reinforcement.

Plastering over an improperly prepared surface will not produce a smooth, durable finish. This step can be rushed or skipped, which can result in uneven surfaces, poor adhesion, or cracking.

As necessary, take your time priming, cleaning, and repairing the surface. Every stage guarantees proper plaster application and long-term durability. Surface preparation is the cornerstone of excellent plastering work, whether you’re building new or renovating.

You’ll position yourself for success and achieve a polished finish that improves the appearance of your area by adhering to these easy steps.

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