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Renew plastering - How to proceed
Renew plastering - How to proceed

Video: Renew plastering - How to proceed

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Video: How to Smooth Out Uneven Plaster With a Skim Coat 2023, January
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A base separates the foundation from the house facade and also protects the masonry underneath. But what different types of plaster are there and how can the plaster itself be repaired? We'll explain it to you.

Table of contents Table of contents Renewing plastering: How to proceed step by step

  • What is a base?
  • Base: The different types
  • What is the plaster base?
  • What is plaster base made of?
  • How much does plastering cost?
  • Where do you buy plastering?
  • How do the plaster damage?
  • Plaster renovation: So you can renew the plaster yourself
  • Renew plastering: This is typical damage
  • Renew plastering in four simple steps
  • Base plaster: How to design the transition area

Table of contents Table of contents Renewing plastering: How to proceed step by step

  • What is a base?
  • Base: The different types
  • What is the plaster base?
  • What is plaster base made of?
  • How much does plastering cost?
  • Where do you buy plastering?
  • How do the plaster damage?
  • Plaster renovation: So you can renew the plaster yourself
  • Renew plastering: This is typical damage
  • Renew plastering in four simple steps
  • Base plaster: How to design the transition area

What is a base?

A house basically consists of four parts: the foundation, the base, the facade, i.e. the house itself and the roof. The base connects the foundation to the facade. There are two main reasons for this. On the one hand, the masonry of the house should be protected from water (splashing water or rain), on the other hand, the base serves as an ornament and thus the visual beautification of the house.

Base: The different types

When building a house, it is often found that the base is not the same. Depending on the design, appearance and function, there are different types of bases.

  • The protruding base: As the name suggests, the protruding base protrudes beyond the facade, so it is thicker than the house facade. Unfortunately, this beautiful construction is rarely found because the top edge of the ledge is exposed to the weather and therefore needs a lot of renovation. In the case of monuments, this construction method can still be admired.
  • The flush base: In contrast to the projecting base, the flush base does not protrude beyond the facade, but ends flush with it. The entire house facade is on one level. The reason for this variant is that it looks very nice optically and a homogeneous outer wall is formed. Because the exterior plaster is applied continuously, damage to the base can usually only be repaired by experts, especially if full thermal insulation or insulation has been applied. Because of this, you should only choose a flush base if you have a large roof overhang (it offers additional protection) or only a low risk of splashing water.
Haus mit bündigem Sockel
Haus mit bündigem Sockel

Modern houses in particular have a flush base.

Photo: istock.com/acilo

The recessed base: The recessed base is the most practical base variant, because it is thinner than the facade and not only separates the house facade from the foundation, but also has a function. Because the house facade protrudes slightly above the base, a so-called drip edge forms, from which rainwater can drip off more easily. As a result, the base is not stressed as much. In addition, repairs can also be carried out more easily with this type of base since the facade does not have to be tackled

What is the plaster base?

The term base plaster means the facade of the base. The base is usually plastered on the outside, hence the name base plaster. It is about 25 centimeters high and often has a different color than the house facade in order to stand out visually. Since the base is more likely to be exposed to rain and splash water due to its location and is therefore more subject to wear, it usually has to be replaced more frequently than the house facade itself. But that's not a big problem - savvy craftsmen can easily repair repairs to the plastering themselves.

What is plaster base made of?

The classic base plaster usually consists of cement and lime mortar. However, cement and lime mortars are available in different grades, which also differ in their function and price.

How much does plastering cost?

If you buy a simple 25 kg sack of cement plaster, you pay around three euros for it. However, if you choose a special plaster version, you also pay eight euros per sack. Anyone who uses renovation plaster due to damage is around 20 euros per sack.

Where do you buy plastering?

You can buy plaster plaster in the hardware store. Here you have the choice between plaster that has already been mixed or a plaster that you mix directly on site. The experts in the hardware store will be happy to provide you with detailed and professional advice at this point.

How do the plaster damage?

Due to the base height of approximately 25 centimeters, the base is a particularly fragile facade part. Because: rain water as well as splash water, soccer balls flying around, wheelbarrows or wet floors are difficult for the base. This is not bad at first, because after all, the plaster base is there to protect the masonry from precisely these things. Because: The plaster base is much easier to replace than the masonry.

However, renewal is still a costly affair. If you let the professional on, you can pay 1000 euros for a length of 15 meters and a height of 25 centimeters. But don't worry, you can save money in case of doubt, because you can also repair the plaster yourself.

Plaster renovation: So you can renew the plaster yourself

If you know where the base damage is coming from, you can professionally repair it yourself. Depending on whether the plaster is only visually damaged or the damage even affects the masonry, various measures must be taken.

Incidentally, the most common cause of damage to plaster base is construction errors. The fabric draws moisture, making it susceptible to tears and damage. Anyone who does not fix the damage directly must expect consequential damage. These include mold formation in the living area or damage to the building structure. Problems that can be avoided with a few simple steps.

Renew plastering: This is typical damage

  • Efflorescence: Salt on the wall, together with water, migrates into the masonry and dissolves there. As soon as the water evaporates, the salt crystallizes and turns into efflorescence, which can then cause cracks in the plaster.
  • Cracks: Cracks can occur either due to the plaster or because the masonry settles. This means acting quickly and not observing cracks for too long.
  • Sanding: If you have lime plaster on your plinth, you often have to struggle with crumbling plaster, because rainwater "leaches" out of the plaster and then begins to crumble.
  • Flaking: In some cases, the plaster plaster detaches from the surface, i.e. the masonry. Bubbles initially form here until the plaster finally flakes off the base.
Haus bauen
Haus bauen

In the construction phase of a house, the white base is particularly easy to distinguish from the masonry.

Photo: iStock / filmfoto

Renew plastering in four simple steps

Base plaster can be repaired relatively easily. If you have a little bit of experience in craftsmanship and would like to do it yourself, then refurbishing the plaster is not a big deal. We explain how to do it in four steps.

1. Prepare: First the base zone must be prepared. Here you should decide whether you want to partially replace the plaster, i.e. only in places, or the entire plaster. With larger flaking, however, a complete renovation is recommended, since the moisture has almost certainly penetrated the entire plaster. To do this, knock off the plaster on the entire base zone with a hammer drill and then remove the mortar from the joints of the masonry with a smaller chisel. Special care is required when transitioning to the facade, this should not be damaged. Finally, the masonry in the plinth area must be swept off and thus cleaned of dust.

2. Masonry: The next step is to check the masonry. Here you should check how much the wall is wet and how much salinization has progressed. If the masonry is damp, this problem must be addressed before the plaster can be applied again. If the moisture penetration and salt deposition is minimal, you can use a renovation plaster.

3. Select material: Depending on the damage and the local conditions, you have to choose between cement, lime or renovation plaster. Cement plaster is water-repellent and frost-resistant, and also withstands high pressure. Lime plaster, on the other hand, is cheaper, but also permeable to salts and water. The masonry dries out. Restoration plasters, on the other hand, are open to diffusion and can bind and even store building materials such as salts.

4. Application: You should apply the base plaster between the upper and lower plaster line. The upper plaster line is the transition to the facade, the lower plaster line the beginning of the soil. Place a board on the bottom plastering line, which not only catches excess plaster, but also enables a smooth edge. Mix the plaster according to the package and throw the plaster on the wall with a trowel. Then smooth it down using a trowel. This layer is called flush-mounted and ensures that unevenness is leveled out. The reinforcement fabric is placed on this concealed installation. Then wait until the plaster is dry - this can take a few hours. Then the second layer of plaster can be applied - this should be carefully smoothed so that the surface is even. In addition, the second layer of plaster should be finer than the first and applied thinly with a trowel. After two to three days, the plaster is completely dry.

If you still want to beautify your base, you can then give it a coat of paint or a colored stone plaster.

Base plaster: How to design the transition area

The base not only connects to the house facade, but also to a floor area. It is all the more important that the base also fits the terrain. Above all, however, the area around the base should be designed so that water can run off. In other words, the bed, footpath or decorative lawn should always be built with a slope and as permeable as possible. A dividing line made of pebbles is also recommended here. If you have to deal with driving rain or other large rainfall more often, you should consider installing a drainage channel directly on the base. This means that the water can run off easily and does not damage the base or the masonry.

If you want to renew or repair your plaster, you will find all the information, instructions and products you need, both online and in the market.

Maren Schwarz Foto
Maren Schwarz Foto

Maren Schwarz

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