Although plastering foam plastic may appear difficult at first, it can go more smoothly if you know a few basic techniques. Plaster can improve the look and longevity of foam plastic, which is a flexible material that is frequently used for decoration and insulation.
For this kind of work, particular methods must be used to guarantee that the plaster adheres correctly and leaves a smooth finish. Every stage is essential to getting the best results, from surface preparation to selecting the appropriate plaster mix.
We’ll walk you through all the necessary procedures and advice for plastering foam plastic in this post, so you’ll know what to anticipate and how to handle any potential problems. This guide will assist you in achieving a flawless finish whether you’re a do-it-yourself enthusiast or taking on a professional project.
- Preparation for work
- Purchasing materials and tools
- Surface preparation
- Surface finishing
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Preparation for work
It is important to note that plastering foam plastic walls requires that the insulation be firmly affixed to the wall, which is achieved using a specific adhesive mixture and thermally insulated dowels.
While some contend that glue suffices, it never hurts to have extra fasteners just in case. All components are further examined for strength after the glue has finished hardening and attaching.
Purchasing materials and tools
What then is needed to complete the task?
The following is the list of materials:
- Mixtures for plastering foam plastic are presented on the market in quite large quantities. But, as practice has shown, the best quality is provided by reinforcing adhesive composition for thermal insulation. It is specially designed for finishing foam plastic and mineral wool with plaster and has all the necessary characteristics and properties, which ensures the highest reliability of the coating and its resistance to a variety of adverse effects.
Universal compositions can be used to glue thermal insulation materials together as well as for surface finishing.
- A deep penetration primer is useful for the final strengthening of the surface after finishing, in addition, the treatment gives the plaster layer additional moisture-proof properties, and antiseptic additives prevent the appearance of mold and mildew.
- Many people are interested in whether it is possible to plaster polystyrene foam without laying a reinforcing fiberglass plaster mesh. SNiP standards and other building standards strictly prohibit finishing without strengthening the surface, since it will be covered with cracks after the first winter. The importance of mesh for plastering walls is very high, so choose a high-quality option with a density of at least 160 g / m 2 and a homogeneous structure without protruding fibers.
Plaster mesh Polystyrene foam reduces the adverse effects of temperature fluctuations on the material and multiplies the strength of the surface.
- Previously, to decorate the corners, it was necessary to cut off strips of mesh and bend them. Nowadays, everything is much simpler: it is enough to buy a ready-made plastic corner with a mesh, which is attached to the solution, and as a result, even without experience, you will make ideal corners of the building. These products come in different lengths, choose the right option in accordance with the characteristics of your building.
Additionally, you must always have a specific set of instruments and gadgets on hand:
- Since the volumes of the solution are quite large, it is worth automating the mixing process. A drill with a mixer attachment for mixing solutions is best suited for this. If you are going to rent a tool, you can take a special mixer device with comfortable handles and high productivity.
The tool is inexpensive to rent, but it makes the work much simpler.
- Plaster for foam plastic is applied using a special facade spatula with a width of 40 to 60 centimeters, with it a narrow version is usually purchased for applying the solution. When choosing, pay special attention to the blade – it must be absolutely flat, in addition, the thickness of the metal must be sufficient so that it does not bend during work.
- Do not forget about the container in which the plaster will be prepared on the foam – a bucket is too small, and it is inconvenient to mix the composition in a small container. There are products made of impact-resistant plastic on sale – durable and capacious, their cost is low, so you should not look for some inconvenient improvised options.
This kind of container is lightweight and practical to clean up after work.
- To level the surface, you will need a grater for grinding with replaceable sheets of sandpaper, and for applying the primer – a roller. Don"t forget about these little things.
Surface preparation
This stage includes the following tasks being completed:
- As noted above, the strength of the fastening of all foam sheets is checked. If there are unreliable areas somewhere, reinforce them with dowels for thermal insulation.
- If noticeable cracks have formed between the sheets, it is best to seal them with polyurethane foam: it not only seals cavities well, but also has high thermal insulation properties. After the composition has hardened, its excess is cut off with a knife.
- There are cases when there are bulges on the surface that need to be removed. The easiest way to do this is with a special plane or a grater for foam – it simply tears off excess material and levels the surface.
With the grater shown in the picture, you can quickly level the surface.
Foam plastic plastering is an easy technique that can improve the durability and aesthetics of your walls. Using this technique, a layer of plaster is applied over foam plastic to produce a smooth, polished surface that is simple to paint or decorate. Gaining proficiency in this technique will help you achieve professional results and guarantee that your wall decoration is both aesthetically pleasing and long-lasting. These key components include proper surface preparation, selecting the appropriate plaster mix, and applying the plaster evenly.
Surface finishing
Let us examine the process of applying plaster to foam while adhering to all technological guidelines.
- If foam is plastered with cement mortar, the reinforcing mesh must be resistant to alkalis, this is a very important factor, because the composition can destroy the material.
- First, the mesh is cut into pieces of about 1 meter or a little more, the main thing is that it is convenient for you to work with a piece.
- A layer of glue is applied to the wall, which is prepared exactly as required by the instructions on the package, otherwise the properties of the composition may be impaired.
- A piece of mesh is pressed against the surface and pressed into the solution with a spatula or float, if necessary, you can add a little solution on top so that it covers the entire surface.
Thoroughly press the mesh into the mortar.
Counseling! To prevent seams from showing on the surface, keep in mind that the joints between the mesh and the mortar are not sealed and are only completed when the second piece is applied with an overlap.
- The strips are glued vertically row by row until the entire surface is covered. After it dries, the walls should be cleaned using a float with sandpaper. This is done in circular motions without applying too much force.
- Next, the final leveling layer is applied, this is done with a wide spatula, the mortar is applied in a thin layer of 3-4 millimeters, while trying to make the plane as smooth as possible and remember that the seams between the areas of application of the mortar should not coincide with the seams on the reinforcing mesh.
Crucial! Grouting must be done within a period of one day following the application of the leveling layer and four days thereafter. This is because the solution needs to be leveled at a strength of 60–80%; if it is too old, leveling will be much harder.
There might be several choices for the ultimate finish after this:
- Painting.
- Applying bark beetle plaster to foam or other decorative compositions.
- Finishing with mineral plaster.
One of the most common textures is that of bark beetles.
This brings an end to the discussion of plastering a foam wall. As you can see, everyone can complete all of the work, and the impressive sums of money paid to builders often don’t reflect how difficult the job is.
Step | Description |
Preparation | Ensure the foam plastic surface is clean and free of dust. Repair any damage before starting. |
Primer Application | Apply a primer to help the plaster adhere better to the foam plastic. Let it dry completely. |
Plaster Mixing | Mix the plaster according to the manufacturer"s instructions, achieving a smooth and consistent texture. |
Plastering | Apply the plaster in thin layers using a trowel. Smooth each layer before applying the next one. |
Drying | Allow each layer of plaster to dry completely before applying additional layers. |
Finishing | Once the final layer is dry, sand the surface to achieve a smooth finish. You can then paint or decorate as desired. |
If you know the essential steps to take, plastering foam plastic can be a fairly simple process. A smooth, long-lasting finish that improves the look of your walls can be achieved by using the right methods and supplies.
Prior to applying plaster, the surface must be adequately prepared. To guarantee strong adhesion, this also entails cleaning the foam plastic and using an appropriate primer. By following these preparatory steps, common problems like peeling or uneven application can be avoided.
Be patient and work in small, manageable sections when plastering. This method aids in producing a finish that is reliable and excellent. It’s important to remember to give yourself enough drying time in between coats to guarantee proper plaster setting and the appropriate level of durability.
Plastering foam plastic can be a rewarding do-it-yourself project if done carefully and with attention to detail. By following these instructions, you can produce an end product that looks professional and works well with your wall décor.