Worth knowing about different grout and joint types

Worth knowing about different grout and joint types: types

Worth knowing about different grout and joint types

Baufugen can be easily sealed with Sealants from cartridges, available at your hardware store. Essentially, a distinction is made between sealants based on silicone, polyurethane, polysulfide acrylate and hybrid sealants.

Two main groups have been highlighted: Silicone sealants and acrylate sealants. Silicone sealants are very elastic and cause movement (but they also become less elastic over time), but they are neither sandable nor paintable.

Acrylic sealants have the advantage that they are offered in color, are sandable and paintable, however little elastic and worse to process as silicone sealants.

In the following you will learn interesting facts about grout and grout types as well as different application areas in your own home.

To the diverse Adhesion surfaces and to meet special requirements, correspondingly matched variants of the sealant groups are available.

A general overview of the individual areas of application should give you an explanation of some sealants for the various construction sectors. Learn more below.

Worth knowing about different grout and joint types: knowing

Joint sealing: How it's done right!

1. In the first step, all joint edges must be carefully marked duct tape be taped.

Worth knowing about different grout and joint types: grout

This can avoid ugly sealing residues on the tiles and the associated annoying reworking.

2. In the second step, the joint bottom and the sides of the joint are used to improve the adhesion primer pretreated.

Worth knowing about different grout and joint types: joint

3. Subsequently, the caulk injected into the joints.

You must make sure that you spray the sealant out of the cavity as far as possible without settling.

Worth knowing about different grout and joint types: grout

4. In the fourth step, you must now carefully press in the sealant, smooth and with a spatula remove the excess. Make sure that you remove the tape only after you have smoothed the joints with the spatula, so you achieve a clean result.

Worth knowing about different grout and joint types: joint

5. Finally, you can use remaining bumps with wet fingers subsequent smoothing. Simply brush gently over the still-sealed joints.

Sealing compounds for indoor use

Neutral and vinegar-crosslinking silicone sealants

Generally suitable for sealing on tiles and metals are the neutral silicone sealants, since they have a good adhesion to almost every building surface. Highly recommended is one Primer pretreatment for strongly absorbent substrates and various plastics. Also, vinegar-crosslinking silicone sealants are applicable to the interior of tiles and metals, if they are not subject to corrosion.

Silicone sealants based on water

Advantages in terms of paintability offer the silicone sealants water-based, because they have no chemical emissions, are correctable in fresh condition and a cleaning of the hands and tools can be done with water.

Acrylate sealants

The acrylate sealants should only be used in joints (eg sealing of shutter boxes) are used, the one low movement subject. For connecting joints in the wooden floor must be used sandable and paintable acrylate sealants.

Cover sealed joints

In principle, a full-surface sweeping of the water-based silicone sealants and the acrylate sealants is possible, as long as it is not expansion joints.

With the exception of a few special products, the colors never reach the necessary elasticity, so that the expected total deformation of the joint Do not exceed 5% should. In contrast to wallpapers, the sealants are no absorbent background for colors.

The colors dry out on the sealant surface. Especially with dispersions, depending on the filling content of the paint used, cracking of the paint can take place after drying. Generally, this cracking can be avoided if the paint before the job diluted about 10-20% with water becomes. After the paint has dried, a second coat of paint may be required to achieve the desired ink coverage.

Sealants for outdoor use

Neutral and vinegar-crosslinking silicone sealants

In the wall and facade area become predominantly mineral building materials used, so that the use of vinegar-crosslinking silicone sealants is not possible. Sealing and sealing should be done in this area with neutral silicone sealants. In general, with strongly absorbent substrates and joints in the permanent wet area (eg between wall and floor) one primer pretreatment necessary.

Silicone sealants based on water

Is the adhesive substrate wet, only water-based silicone sealants can be used for sealing and sealing. It must be ensured that the joint can then dry out. Another advantage of the water-based silicone sealants is that they are paintable and a easier handling as they are correctable in the fresh state and carried out a cleaning of the hands and tools with water.

Dispersionacrylat sealants

For sealing wall cracks Dispersion acrylate sealants are used. Care should be taken that it does not rain during and shortly after this work. Since dispersion acrylate sealants are water-dilutable, the filling could be flushed out.

Special properties are their recoatability and adhesion to damp substrates, but they should not be used in wet areas and / or for floor joints. A special variant of acrylate sealants with a granular structure allows one good visual repair of wall cracks at Rauhputzen.

Backfill material for expansion joints

An important condition for a perfect function of expansion joints is u. a. that one Three-sided adhesion is avoided. The adhesion to the joint bottom is prevented by the use of a backfill material. In addition, the backfill material facilitates compliance with the prescribed joint depth.

Primer as primer and primer

In practice, there is so far neither the universal sealant nor the ideal substrate. To both, Sealant and substrateTo permanently connect and thus avoid possible leaks and subsequent structural damage, the use of a primer recommended.

primers also adhesive, primer and primer called, are products in the trade, which optimize the adhesion of a sealant to the substrate. Primers are usually in glass, aluminum or polyethylene containers with a content between 30 to 100 ml offered.

Worth knowing about different grout and joint types: different

In a number of applications, the use of a primer is recommended or even prescribed. Despite constant product improvements within the sealant pallet, each sealant manufacturer has specially coordinated primers in its program for its sealants and their areas of application.

By using a primer, the cohesive forces between substrate and sealant are increased by chemical or physical reactions. Especially with porous substrates such as concrete or masonry, the strength of the substrate itself is enhanced by the penetration of the primer and thus built a better adhesion.

Processing of primers

Every product is only as good as its workmanship. This is especially true for the processing of sealants and primers.

Top priority here: the underground must fat free, dry and dust his. Loose parts, for example mortar residues, are to be removed.

Furthermore, that applies after applying the primerWhat is usually done with a brush, a Flash off time (drying time) is to be noted. This time is usually between 30 to 60 minutes. Only then may the sealant be applied.

Further notes on when and how a primer should be used are on the respective Sealant packaging or to find on the primary container. Some manufacturers also provide additional processing instructions on their websites or on the service telephone.

The question of whether a primer is absolutely necessary can not be answered on a flat-rate basis. So can in the processing of Silicone sealants on silicate substrates, such as glass or tiles are usually dispensed with the use of a primer. On porous surfacesOn the other hand, such as concrete, wood or masonry, the use of a primer is usually indicated.

In case of doubt always: carry out test experiments!

Special sealants

There are use cases for which you have one certificate or special technical characteristics of the sealant, such as ovens, natural stones or mirrors. These properties can only meet certain sealants.

Such special sealants are available i.a. for the following areas:

  1. Food compatibility and drinking water compatibility (eg for the oven)
  2. High temperature resistance up to max. 300° C (eg for the oven)
  3. crystal-clear, highly transparent designs for showcases and shop windows
  4. Gluing mirrors
  5. Sealing and sealing of natural and artificial stones
  6. Requirements of fire protection class B1 (flame retardant)

Example: High-temperature sealant for ovens

Worth knowing about different grout and joint types: knowing

When things get hot in the kitchen, high-performance adhesives are needed. For example, if the disc of the oven no longer holds.

Is a repair, helps High temperature silicone (eg from Ceresit): The high temperature silicone is highly elastic and extremely heat resistant up to 315° C, Of course, there are still not just the oven screen further fields of application: on stovepipes and fireplaces, heating systems and dryers, on washing machines and heat exchangers - whether indoors or outdoors.

Joint types - elastic and plastic


Especially in the sanitary area, the home improvement has it joints to do. They arise where washbasin, bathtub or shower cup meet wall or floor.

construction joint

If two structures, wings or sections of construction collide with one another without modification due to reconstruction or extension, this is called a construction joint, For soundproofing These joints can be specially filled or used to compensate for settlements. Specialists also speak of building joints, construction joints or a construction seam.


It can not be detected by superficial observation, but building materials are always in motion due to temperature fluctuations and humidity. In order to compensate for these movements, it is necessary in some areas to make the connection of building materials elastic - with an expansion joint, which is also referred to as a movement joint or dilatation joint.

With joint seals made of silicone or rubber Stress cracks prevented, Above all, when meeting components in the outdoor area, sufficient freedom of movement must be ensured. Architects therefore plan an expansion joint for such critical areas.

To the Protection against the weather These joints are sealed. It is important to use the appropriate sealing material. When using a rigid inelastic sealant cracks can occur by the movements occurring, penetrates into the water, which leads in particular in winter by ice formation (volume increase) to structural damage.

Worth knowing about different grout and joint types: types

Elastic and plastic joint on movement

Therefore, elastic sealants must be used to seal expansion joints. These are u. a. weather resistant and have a high permanent elasticity.

One speaks of a maximum permissible total deformation of a sealant. This value is between 10% with predominantly plastic sealants and 25% for elastic sealants.

Predominantly plastic sealants should therefore be used in joints that are only sealed and one low movement subject (eg in the bathroom, the connection joints).

Seal joints in the sanitary area

At present, in the sanitary area is still primarily vinegar-curing sanitary silicone applied. It has a very good adhesion to glass and glazed surfaces. Other advantages include fast curing, high abrasion resistance and very good chemical resistance.

Worth knowing about different grout and joint types: types

Neutral silicone sealants

An alternative neutral silicone sealants, They are characterized by a wider adhesion spectrum and a low-odor curing compared to the vinegar-crosslinking silicone sealants. However, their through-cure times, abrasion resistance and chemical resistance are slightly lower, in contrast to the vinegar-crosslinking silicone sealants.

Sanitary silicone based on water

Water-based sanitary silicone offers additional benefits. It arises no chemical emissions, you are correctable with water in the fresh state, to clean your hands and tools you only need water and last but not least adhere to damp surfaces.

Acrylate sealant

An application of acrylate sealant is in the sanitary area not recommendedbecause acrylate has no resistance in the permanent wet area.

Silicone primer (primer)

Today, more and more Bathtubs and shower trays made of acrylic plastic manufactured. Due to their special surface treatment, usually no sufficient adhesion is achieved during the sealing. A pretreatment with a Silicone primer (primer) is absolutely necessary. It may even be necessary to roughen the adhesive surface of the acrylic plastic.

Sanitary sealants with fungicide protection

These sanitary sealants are with a fungicide additive equipped, which acts as an antifungal and bacteriostatic agent. However, this protection has its time limits, since it is consumed on the one hand in the fungal and bacterial inhibition, on the other hand, the inhibitory effect of the fungicide only in the soluble state, so that a washout over time is unavoidable.

In general, sealants are not directly affected by mold. It has to be one first Surface contamination (soap residue, dander, etc.) present in which the fungal spores attach and develop under favorable climatic conditions (heat and humidity).

Tip: Good prevention can be achieved by appropriate cleaning. The joints should be rinsed immediately after bathing or showering with clear water, then wiped dry and cleaned from time to time with household cleaners.

Worth knowing about different grout and joint types: grout

Silicone joint with anti-mold long-term protection

Recently there are also silicone joints with Long-term protection against mold, While the fungicides wash out quickly from the normal sanitary silicones, the Sista mold blocker, for example, has a three-phase protection against mildew. There is a 5-year guarantee from Sista.

Seal window and glaze

Specially proven for the window construction special window silicone, These sealants have a good paint compatibility with the most common paint systems for wooden windows and very good adhesion aluminum windows and PVC windows with PVC frame.

Worth knowing about different grout and joint types: types

Vinegar-crosslinking silicone sealants

A use of vinegar-crosslinking silicone sealants in glazing comes only in the Sealing of aluminum windows in question.

A Application on PVC window may cause yellowing of the sealant surface by interaction with the additives of the plastic, in conjunction with the UV radiation.

Furthermore is the adhesion to plastics of vinegar-crosslinking silicone sealants generally not sufficient without primer treatment. The same applies to the adhesion on many paint systems for wooden windows.

Neutral silicone sealants

Cover the neutral silicone sealants the entire range of substrates for the glazing off.

Window silicone - special sealant for window construction

Special sealants for window construction, such as window silicone, have proven particularly useful here. These sealants have a good paint compatibility with the most common paint systems for wooden windows and a very good adhesion to aluminum windows and PVC windows with PVC frame.

Silicone sealant based on water

A Glazing with water-based silicone sealants is possible subject to certain measures. It should preferably dry or smoothed with very little water to avoid another step of cleaning. Furthermore, it must be ensured that the joint is protected against moisture (eg condensation water) until a water-resistant skin is formed.

Acrylate sealant

The acrylate sealants are due to the glazing lack of glass adhesion and low permanent extensibility (eg for compensation in case of temperature differences) not suitable.

Seal roof area

A sensitive area is the sealing and Sealing in the roof area. Here are some critical building materials such as copper, zinc sheet, bitumen and synthetic glass (eg PMMA and polycarbonate) used.

Worth knowing about different grout and joint types: joint

Vinegar-crosslinking silicone sealants

A use of vinegar-crosslinking silicone sealants is to be excluded in any case, as compatibility with the copper, zinc sheet, bitumen and art glass is not given and a Building damage is inevitably the result.

Neutral silicone sealants for work on the roof

Only use neutral silicone sealants that have been specifically designed for the roof area.

Silicone sealant based on water

Difficult requirements Moist surface and paintability are covered by water-based silicone sealants.

Acrylate sealant

Worth knowing about different grout and joint types: different

For emergency repairs and simple seals in the roof area are available to you solvent-based acrylate sealants.

All-weather sealing jointing compound

Clear advantages: All-weather sealing jointing compound (eg all-weather sealing from Ceresit) immediately gets to the point where moisture gets through.

Worth knowing about different grout and joint types: knowing

The crystal-clear special rubber proves itself practically everywhere, adheres even on wet, smooth surfaces, on wood, metal and many plastics.

This joint sealant has proven itself everywhere where quick, clean and almost invisible sealing is required.

Lightning-sealing compound - immediately tight in any weather

Worth knowing about different grout and joint types: knowing

With a permanently elastic, fiber reinforced Sealants (eg Ceresit Blitz-Dicht) can be used to close cracks, seams, connections, holes and other leaks quickly, safely and easily.

The repair shop is immediately waterproof, whatever the weather.

Worth knowing about different grout and joint types: joint

Ideal for applications when things need to be done quickly.

The permanently elastic, fiber-reinforced sealant adheres to all building surfaces outdoors and indoors in any weather, even in frost.

Additional advantages:

Worth knowing about different grout and joint types: joint

  • bridges cracks and holes up to 10 mm
  • also sticks to wet surfaces
  • permanently elastic and UV-stable
  • for outside and inside
  • easy processing
  • is enough for 1 to 2 square meters

(Photo source oven-silicone; sanitary silicone: Henkel)

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