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Interior Plastering Guide: Types, Structure And Cost

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Interior plaster is used as a base for many interior works, including decorative structures and coatings. Interior plaster is used primarily to make an interior habitable. Many types have an insulating and moisture-regulating effect, and can protect against chemical and mechanical loads. When applying interior plaster, it is important to consider the cost, type, and structure.

Interior plasters are a crucial coating when building houses, renovating existing interiors or building a basement. They protect against weather, moisture and noise, and can also have decorative functions depending on their type. Plastering indoors requires careful planning. Without sufficient information, you can quickly run out of material or have it too much, which can cause delays and increase costs. If you require plastering, an interior plastering guide will be helpful. These include detailed cost examples and information about the structure.

Construction of interior plaster

The structure is the foundation of an interior plaster that works. The correct structure is the key to ensuring that plaster can be used for a longer time without any problems or unpleasant surprises. The quality and processing options of the interior plaster will vary depending on the type, but the correct structure can allow it to be used. The construction is made up of several layers that are applied at different heights to the ceiling or wall. These layers are called:

  • Concealed
  • Finishing coat

These are layers that are applied one to the other, as their names indicate. The interior is transformed by the top and bottom plasters into an insulating and weather-resistant layer that conceals the wall adjacent. The plaster is invisible and applied in a thickness of 1-10 cm, depending on the project. It depends on the type of wall. A thicker layer of concealed plaster is recommended for an exterior wall. In residential buildings, concealment layers are usually between one and three centimeters thick. This must be done professionally and thoroughly to avoid the following problems:

  • Flaking
  • Crack formation
  • Bad insulation
  • poor opacity
  • Finishing plaster can’t be properly applied

The finishing plaster is typically not very thick so it is often much less required. The thickness of the finishing render layer is usually between 0.3 and 1 centimeter. These standards specify the total thickness of interior plaster.

  • DIN 18550-2
  • DIN EN 998-1

The plaster thickness is kept thin because the interiors aren’t used as often. The plaster thicknesses of 0.3 cm (thinly applied finishing plaster), and 2 cm (complete plaster system), are adequate. This is consistent with the standards. Basic renovations require a plaster thickness of at least two cms. The concealed plaster can often be removed. It is essential to determine the thickness of the layer as it will save you money on plaster systems. The top coat is applied over the base coat, as mentioned previously. These properties are also available for concealed installations:

  • Fills small cracks or holes
  • This allows for a smooth finish plaster surface
  • The base coat is more adhered to the top coat.

The finishing plaster is a layer of plaster that can be used inside. It can be either smooth or structured. The top coat is a different texture from the bottom coat, which makes it possible to wallpaper and paint. This is the most significant difference between the two layers. The tension compensation must be created by plastering. An elastic plaster is required because walls can change in temperature. The finishing plaster is harder and more flexible than the conceal plaster. The solid plaster protects the concealed mortar and balances out tensions. Here are the important factors that determine which types of interior plaster to use. Top and bottom plaster cannot be mixed from different materials. This is why we will be discussing it below. These are some ways interior plaster can be applied:

  • Finishing and concealing
  • Only flush-mounted
  • Only finishing plaster

This is due to the many uses. A finishing plaster is a plaster that can be used to plaster a room, even if it isn’t on an exterior wall. A specialist should be consulted if you are unsure about the structure you want. A specialist can help you assess your situation and give you more information about the right structure. A new house may require a different structure than one that is in need of renovation. You should also consider the type of room, as damp rooms require different systems.

Tip: You must remove any finishing plaster before you apply decorative plaster to a plastered wall. Otherwise it will be difficult to stick to. Decorative plaster is a thin layer of plaster that can be applied to a structure in order to add creative accents and designs.

Take note of the subsurface

The substrate must be prepared before interior plasters can be used. There are many types of masonry available with different properties. These include:

  • Brick
  • Concrete or aerated concrete
  • Ytong
  • Sand-lime brick
  • OSB panels
  • Plasterboard

You can plaster all of these fabrics, but you need to make certain preparations. The plaster can be applied as-is. It will either get absorbed by the wall or “burned in”. This can lead to poor results that affect the function of plaster. This is a common problem. The plaster will not stick to the masonry if it is too smooth. You will need to use a burn-on barrier made of porous or absorbent materials. Adhesive bridges can be used if the surface is too rough. This can be covered with plaster. A professional can also be consulted if you have any questions about the masonry’s condition. This makes planning much easier.

Types of interior plaster

The choice of type is an important step in interior plastering in auckland. There are many types of interior plaster available. These materials will determine the properties and performance of the plaster system. There are two types of plaster for interior plaster: the upper and concealed. They complement each other, as we have already explained. It is important to use different types of plaster for each layer. Otherwise, you will end up with instability that can damage the interior or the masonry. These sections will introduce you to some of the most common types of interior plaster. A layer thickness of ten micrometers is required to calculate the cost per square meter.

Gypsum plaster

The classic interior finishing plaster Gypsum plaster can be used to cover walls and ceilings. High-quality interior plaster can be used to coat ceilings and walls. The decorative use of Gypsum plaster is possible. It can also be used as a fireproofing material and releases moisture during a fire. It is very breathable and regulates moisture well, creating a pleasant indoor climate. It is not recommended to be used in damp areas. Because of its easy processing, Gypsum plaster is frequently used. It is structurally and environmentally harmless.

Costs: 0.40 – 1.50 euros per m2

Gypsum-lime plaster

Gypsum-lime plaster is a combination of the properties gypsum, lime and can be used as a base coating. It can be used on the following masonry:

  • Brick
  • Sand-lime brick
  • Natural stone
  • concrete
  • Concrete aerated

It is safe and balances wall tension well. Interiors will love the climate-regulating and effective vapor diffusion properties. It can be used as a finishing plaster or mixed with filler.

Costs: 1 to 2 euros per m2

Lime plaster

Lime plasters are effective in removing excess moisture from the air and reducing the likelihood of mold formation. It can be either smooth or coarse, and is often used decoratively. A high-quality product can be very expensive in terms of cost. They provide a pleasant environment and are easy to spread. Lime plasters can be shock-resistant depending on their type. They are suitable for light to moderate usage.

Prices: 0.6 to $30 per m2 (highly dependent on quality).

Tip: Tadelakt, a Moroccan lime plaster is a unique form of lime plaster. It is water-resistant and high-gloss. It is ideal for damp rooms. Tadelakt, an interior plaster system that costs around 100 euros per square meter, is among the most expensive. It is difficult to apply and requires a specialist.

Lime-cement plaster

Base and topcoat made from lime and cement that has waterproof properties indoors. This is one of the most popular types of damp-proof plaster. It can be applied thinly and still has great results. Its strong properties make it ideal for concealed installations, especially in cold or drafty masonry. Too much moisture can be absorbed well. You can even handle heavier loads without problems.

Costs: around 4.5 euros per m2

Thermal insulation plaster

When the interior masonry is extremely cold, thermal insulation plaster is the best choice. These plasters are flame-retardant (DIN 4102) or non-combustible (DIN 4102) and come with many additives to support this property. The flush-mounted version can be used to enlarge masonry that is not compliant with the EnEV (Energy Saving Ordinance). These are some possible uses:

  • Passive houses
  • Low-energy houses
  • Attics
  • Energizing renovation
  • Thermal renovation
  • Improvements to the insulation properties

They are flexible, elastic, tear-resistant, water-repellent, and easily stretchable.

Costs: 4.5 to 6 euros per m2

Synthetic resin plaster

Synthetic resin plaster is one of the most costly variants. It is made without mineral substances. These dispersion plasters are made from polymer dispersions, and are mixed with the following additives.

  • Silicone resin emulsion
  • Potash water glass
  • Resins (dissolved).

Although they look similar to conventional plaster, they are only used for decorative and finishing plasters. They are ready-mixed and available in many colors and structures. This is why they are so costly. They are extremely resistant to impact and stick well to mineral plaster. The use of synthetic resin plasters can also be used to bridge cracks and ETICS (thermal insulation composite system).

Prices: Starting at 20 Euros per m2

Clay plaster

Clay plaster, as its name suggests, is clay mixed with clay and many other additives.

  • Fine earth
  • Sand
  • Clay powder
  • Marble sand
  • Plant starch
  • cellulose
  • Color pigments
  • Vegetable fibers

They are also provided with various so-called effect substances, which provide color or grains. It is a finishing coat that can be applied to any surface. Although it is difficult to use, it looks elegant. They look natural and can be used in any interior. Clay plaster is non-flammable, diffusion-open, soundproof and effective insulation. The humidity is controlled and all allergens and fine dust are removed from the air. These properties are what make plaster so popular. They are equally suitable for older buildings. Professional edge protection is essential when building clay plaster. It is water-soluble.

Interior plaster renovation costs

The costs of interior plastering are not to be overlooked. Interior plaster systems can be applied wet so too much material can be ordered quickly, which can have a negative effect on your budget. To limit losses, it is important to calculate the individual costs of each project. These are the points to consider when calculating interior plaster systems:

  • Material for interior plastering
  • The size of the ceiling or wall
  • Quality
  • The texture of walls
  • New or old buildings
  • Time and effort are the best investments.

You should not be surprised if the cleaning system you choose results in significantly higher prices than you expected. The individual positions can make the cost of cleaning more expensive than you expected. The average price per square meter ranges from 8 to 50 euros. However, the quality level will affect the price. The following quality levels are appropriate for different applications:

  • Q1: highest quality, paintable, smooth surface
  • Q2: Light-weight wallpapers are suitable for painting.
  • Q3: Normal wallpapers are acceptable, but matt surfaces can be used
  • Q4: More rough, suitable for tiles

Most private homes use Q2 through Q4. This quality level is only for finishing plasters, since the base plaster has a different function. You will need to pay around 150-300 percent more for a Q1 plaster. The price difference between the different quality levels is minimal. These can be assumed to represent between 15 and 50 percent. Price increases are due to the increased effort required by companies to invest in the project. This varies depending on the quality of the work. Consider the following:

  • Flush mounting in an old building: 8 to 15 Euros per square meter
  • For new or old buildings, without hidden installation: 20-50 euros per square meter

These numbers are based on empirical data, since each company has different costs. Prices for interior plaster are typically given in euros per square meters. Square meters are sufficient to determine the thickness of the interior plaster layer. It is thinner than the exterior plaster’s. These measurements will allow you to determine the square meters of plastered area.

  • In m, the length of the ceiling or wall.
  • In m, the height of the wall and the width of the ceiling

These values will be inserted into the formula.

(Length and ceiling height in m) x (height and ceiling width in m), = area to plaster in m2

The combined areas of each wall and ceiling are then added. The total is then divided by the areas of windows, doors, or other openings. These are not plastered so you don’t need to buy any extra material. The work time is also reduced. The cost of plastering can be calculated based on the size and type of the job, as well as the quality level and work load.

Example calculation

Here’s an example of a 40m2 room that will be plastered. The two most affordable interior plaster options were the plaster-lime plaster base plaster and the plaster top plaster . Here’s an example of the cost:

  • Concealed: 700 to 775 euros
  • Finishing plaster: 350-400 euros
  • Ground coverage: 180-200 euros
  • Total cost: 1,230 to 1,350 Euros
  • Cost per m2: Between 30.75 and 33.75 Euros

These prices include all costs associated with the operation, such as travel and salaries. The subsurface preparation is also included. Gypsum plasters are easy to use, so the cost is low. The material costs and operation costs can be used to create your invoice. You should find out beforehand about hourly, flat, and salary rates to help you determine an approximate price. This can be offset with material costs. As mentioned above, prices will vary depending on which type of plaster you choose. The material costs can be used to determine the approximate price. As an example, consider a Q1 Interior plaster.

  • Concealed: 700 to 775 euros
  • Finishing plaster: 1000 to 1,250 Euros
  • Ground coverage: 180-200 euros
  • Total cost: 1,880 to 2200 euros
  • Prices per m2: Between 47 and 55 Euros

A high-quality finish plaster can be almost twice as costly, as you can see. Plastering can be very costly even for small rooms if you choose a concealed installation. The cost of replacing the topcoat is significantly lower because it is being removed and replaced. If the walls are wallpapered with a Q3 finishing plaster, this could look like:

  • Finishing plaster: 350-400 euros
  • Wallpaper removal: 250-300 euros
  • Ground coverage: 180-200 euros
  • Total cost: 780 to €900
  • Cost per m2: 19.5 – 21 Euros

Plastering a ceiling costs the same. These are deducted from the total cost of plastering a ceiling in a room that has 40 square metres of wall surface and 20 sq. meters of ceiling. The floor covering cost is not affected by the increase in the bill, since it remains the same. This last example relates to plastering the ceiling and walls with interior plaster.

  • Concealed: 1,050-1,125 euros
  • Finishing plaster: 1,500-1,875 Euros
  • Ground coverage: 180-200 euros
  • Total cost: 2,730 to 3200 euros
  • Costs per m2 range from 45.5 to 53.5 Euros

When estimating costs, it is crucial to plan correctly, which includes recording the type and location of the plaster primers. The interior plaster cost for a new building is approximately three percent. Prices can vary widely from one region to another and from one company to the next. Before you order interior plaster, it is important to do some comparisons.

Is it possible to make a personal contribution?

This is the crucial question regarding interior plastering. This is the correct answer. Plastering can be a complicated project and there are many things that could go wrong. Modern plastering uses special tools for spray plastering and machine plastering. These devices deliver much better results than hand plastered systems. Your contribution is not enough to make the cost of the project significantly lower, but the end result is still poor. Professional companies can take over the job so you don’t have to pay more to fix any problems.

Tip: You can make minor repairs to the finishing plaster without difficulty. All you need is a small trowel, the appropriate plaster and the necessary finishing plaster. A finished plaster can also be used for independent plastering. This is possible because it doesn’t require any special equipment to achieve a great result.

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