Joint renewal in bathrooms and kitchens

scratch silicone joints in the shower

renew old joints - new grout Bad

Old joints in the bathroom and in the kitchen not only look unsightly, but can be really dangerous. If water spills or leaks through the joints behind the shower tray marred the sealing joints in the kitchen mold, are costly and sometimes harmful consequences to the house.

The replacement and renewal of joints is fairly simple - if you bring some skill and have the right tools.

This guide also gives layman how to renew joints in the bathroom and in the kitchen.

Contents: Replace joints

  • Silicone joints: The Basics
  • Silicon joint renewing step by step
  • Materials and tools
  • remove silicone joints and clean joints
  • New ejecting silicone joints and smooth

Silicone joints: The Basics

ejecting wall connection to the bathWhere different elements abut one another - here a bath and wall - is exposed to an elastic joint considerable stress. Trotdzem it must remain permanently sealed.

Of silicone joint sealants in the sanitary sector very high demands are made. You need to bring good processing and sealing properties, as well as these sealants have to be permanently elastic, so that they can absorb movements in the ground without the joint breaks.

Thus, for example, can often observe that joint tear in the wall-floor junction at too early disposal. You can prevent this if grouting in this area takes place only after a certain waiting period, and - even more important for long-term success - Silicone Sealants are used with a particularly high elasticity.

For critical trades, such as terraces, balconies or bathrooms, high movement capacity is required of joint sealants. Here Silicone Sealants are used with a particularly high elasticity, so that the thus applied joints remain permanently elastic also under the increased load and the building from damage, for instance by penetrating water can preserve.

technical requirements

In the development of joint sealants silicone rubber-based special attention is paid to the elongation at break, measured according to DIN 53504 which is about 400 to 600%. Moreover, a high motion recording is needed, so that the above-mentioned use in critical trades, such as terraces and balconies, is possible.

Due to the high variations in temperature by direct sunlight and frost are outside the house, the requirements on the sealant, which is used in the field of stretch and movement joints enormously. High-quality silicone sealants are therefore developed so that they have a temperature resistance of -60 ° C to +180 ° C and are resistant to weathering and aging. Because of the UV resistance such silicones are also suitable for this application.

For use in the kitchen and in the bathroom because of the frequently used there detergents high chemical resistance of the elastic joint sealant is necessary.

In addition, the silicone is solvent-free and environmentally friendly, threaten by fumes during processing and thereafter no health.

Silicone in practical use

Father and son when groutingIn damp rooms, such as bathrooms, there is an increased risk for a mold. Silicone Sealants with anti-fungal agents can mitigate this risk.

Particularly widespread are acetatvernetzende silicone sealants. In the crosslinking, so when joining the molecules to each other to an elastic structure, acetic acid is eliminated - thus comes to the typical smell of vinegar curing silicone.

The advantage of these acetate-systems is a particularly good adhesion on all ceramic coverings in walls and floors - in the sealing of joints as connection to ceramic tiles, sinks, bathtubs, shower trays, door and window frames as well as for use in expansion joints. Even for grouting glass constructions high-grade silicone is used. Another advantage of these systems are a fast curing and a high abrasion resistance.

The requirements for silicone sealants but are not limited to their mechanical properties. Most sanitary silicones are also set to fungi and bacteria resistant. Showers and bathrooms are nevertheless particularly vulnerable to mold, and the risk of contamination can be significantly curbed by this additional chemical protection. With proper cleaning and maintenance of the desired appearance of the joint is permanent.

Whether protection against mold is desired, however, depends on the application. In bathrooms, use will be fungus-inhibiting sealants usually in kitchens but you should refrain from everywhere silicones with fungicidal additives, where the sealant comes into contact with drinking water. The reason: Fungicides can be partly washed out by water.

No problems arise regardless of the application in optics: Silicone sealants are available in many colors - including both classic and current sanitary colors and some very colorful color schemes that can make its own contribution to the design of spaces.

Silicon joint renewing step by step

First, you should be aware of how the new joint should look like, so how wide it is. That depends not only optical, but also from a technical point. And of course this also the material requirement is determined.

The necessary joint width for a dense Sanitärfuge always depends on the nature of the material and the sealant used. adjacent to the joint tiles or ceramic pieces can completely straight, but irregular edges have, they can be parallel, but also be installed somewhat inaccurate. Simple rules of thumb do not exist, therefore, the only certainty is that the visible joint width must be somewhat larger than the to be filled gap width. 

In most cases, about two and a half times the joint gap should be sufficient. With a gap of 5 mm, this would therefore 12.5 mm. Outdoors or other thermally highly stressed environments should be expected three to four times. Here, at a 5-mm gap has a gap width of about 20 mm would be sufficient. This is sufficient to compensate for thermal deformation and permanently seal the joint.

Upon renewal of joints can easily be oriented to the recent joint one also. One or two millimeters in addition can not hurt, because silicone over the years a little fades. If the old joint is abgerisssen over longer distances and columns have formed adjacent to the material, you should be sure call but work much more generous.

Materials and tools

  • Fugenhai
  • silicone
  • Mold remover
  • Sponge or cloth
  • masking tape
  • caulking gun
  • Fugenglätter
  • rubber gloves
  • sanitary silicone

remove silicone joints and clean joints

To remove the old silicone is a so-called Fugenhai is with interchangeable, fixed blades made of stainless steel very good. With the sharp end of the blade, first catch the silicone and then cut the silicone composition of the adjacent land, and out of the joint.

Work carefully stick to it and the more you remove silicone and in short stages, because in this step adhere the less remains, the less rework at a later date - a total deliberate approach saves time so.

The Fugenhai cuts because of its sharpness smoothly into the sealant. If the work so laborious, which may be due to a dull blade. not simply exert more pressure, because that only increases the risk of injury. A dull blade should be replaced.

Scrape out old silicone jointsWith the sharp blade of Fugenhais so much is removed from the old silicone joint as possible. Do not put too much force, otherwise you may be injured when slipping.apply siliconeThe silicone is applied from the cartridge according to regulations. In most cases, so up to 2 mm can dissolve thick layers.

Without any leftovers you will in many cases the old silicone can not remove this way. Then help by using a chemical silicone. It is applied to the sealant remains after the manufacturer's instructions and then also acts according to manufacturer's instructions.

Before applying, you can mask off the ground on both sides of the old silicone joint with masking tape. This will prevent adjacent joints are dissolved, which should not be renewed. In addition, no dissolved silicon can then be accidentally smeared in the area.

After the exposure, the dissolved residues and residues of the remover are thoroughly with a sponge or cloth removed. If you have taped the joint, remove the masking tape previously.

Silicone apply (detail)Silicone is also available in small containers - convenient if only about the sealing of a single sink should be replaced.Silicone wipe after applicationAfter exposure to wipe away the dissolved silicon residues and the residues of the remover thoroughly with a sponge or cloth of the joints.

Now inspect the cleaned joint thoroughly again. Discover this mold, then it must be removed before you eject the joint again. These are the selection of the construction markets numerous products. When buying a Schimmelentferners that it is compatible with the treated surfaces, and apply it exactly as specified by the manufacturer.

The best way for you to work with the windows open with household gloves and a surgical mask.

New ejecting silicone joints and smooth

Especially when handling for the first time with silicone sealants, you can, cover the gap in the intended width again with painter's tape.

Now Prepare the sealant cartridge. It is cut, then bolted to an unused spout on. Then insert the cartridge into the caulking gun and cut the nozzle at an angle. How far has to be the opening, also depends on the joint width. Most have an opening of 2 to 3 mm should be enough - you can recut later if needed still.

The push lever of the caulking gun is then operated several times until resistance is felt. Now you can eject the joint. That should happen smoothly and if possible in a train. For wide joints you can use the silicone compound in tight, bring close together lying loops. This is sometimes easier than gleichgmäßig to squirt a thick strand.

ejecting joint with siliconeInject the joint evenly and in a train from. For beginners, it may be easier to work with such a dispenser as the caulking gun.injecting silicone with the gunThe classic method is the ejection of the cartridge gun. even so evenly without stopping in a train Fashion.

Do you need to settle in between the cartridge once, then press the small release lever on the trigger. Otherwise is still pressure on the cartridge, and the silicone can uncontrolled spill into the environment.

smooth silicone jointWith a Fugenglätter pull the silicone now evenly and in a train from. If necessary, you can use a weak detergent solution as a release agent.Silicon joint smooth (detail)Here the process up close: Be sure to keep the trowel during stripping always at the same angle to the joint.

Is the joint ready ejected, it will be smoothed. Thus adheres to the tool used for this purpose as little silicone, one can wet the silicone with a release agent. For this example, a weak detergent solution is sprayed to the pump bottle is. That should only be done, however, if the sealant was introduced in fact evenly and in sufficient quantity, because the release agent also makes it much more difficult to add to or silicone at defects if necessary.

For smoothing is best to use a Fugenglätter of flexible plastic. With it, you drive the joint evenly, taking particles of excess sealant. The result is best when flatten the seam without stopping in a train. Also make sure to keep the trowel always at the same angle. Adheres then silicone to the smoother, you can wipe with a dry cloth it.

Under yourselfers is quite popular is the way to smooth a silicone joint with the spülmittelbenetzten finger. But that will rarely get accurate results as working with the plastic smoothing, and not everyone wants to have sealant residue on your fingers. So the few euros for a set with multiple smoothers are money well spent.

Once the work you have to let the silicone time to crosslink before the joint can be loaded or may come into contact with water. Evidence can be found on the cartridge. They can thereby also trust your nose: As long as the sealant still exudes its characteristic odor, he is not able to bear weight.

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