Build your own bathroom: bathrooms in the drywall system

Bathrooms in drywall - the pitfalls are in the detail

Build your own bathroom: bathrooms in the drywall system: your

Modernization, refurbishment, extension or rebuilding - the "dry type" is particularly important in the housing and homeowners. For many homeowners, the "expandable attic" offers to expand the perceived as a tight space situation for z. B. larger, more independent children or as a guest room.

But only with the installation of a separate bathroom, the additional living space is perfect. If additional living space is needed in a house, it can often be created with a loft extension. Here then find child or guest rooms to small apartments place.

This article describes what to look for in a bathroom in the roof - so in retrospect, a lot of trouble is spared!

Do-it-yourselfers who plan drywalling with plasterboard can save time and money. The advantages of the dry construction method are convincing: prefabricated systems for a quick installation of the "lightweight wall constructions" on stable frameworks made of metal profiles, short drying times and flat wall and ceiling surfaces that can be immediately wallpapered or tiled. These advantages ensure a speedy and easy-to-carry expansion.

When drying bathrooms, however, it is important to consider the special requirements for moisture protection. For gypsum naturally absorbs water and swells up. Only by sealing directly between drywall and tiles, including the solution of all detail problems, a durable, sustainable and safe protection against damage from moisture can be achieved with little effort. The following method of sealing in the composite is applied by professional tilers in the same form and complies with the recognized craft rules.

Build your own bathroom: bathrooms in the drywall system: build

A generous bathroom under the sloping roof - with dry construction systems, the wellness oasis can also be created in-house.

Do-it-yourselfers should resort to drywall systems when upgrading bathrooms, where all components such as substructure, gypsum board paneling, screws and joint filling are coordinated and tested. The pitfalls of drywall in bathrooms are in detail, such. As in the transitions between different wall structures, the various pipe penetrations, tub connections, etc. And unpleasant surprises do not want to experience home improvement with certainty!

Wall construction in drywall

Metal double stud walls as installation wall (example of the company Rigips).

  1. Plasterboard vario building panels
  2. Metal substructure
  3. cavity damping
  4. Support stand for wall-mounted WC and built-in cistern
  5. Support stand for washbasin

The three main advantages of a composite seal in dry construction:

  1. No moisture penetration of moisture-sensitive surfaces and thus no creeping damage to the substrate.
  2. The construction remains dry. The seal consists of a casting without seams and joints.
  3. A safe and flexible bonding of the ceramic coating on the seamless seal.

Walls in bathrooms can be built with a single or double column structure as a supporting base for the ceramic covering. Double column walls also often serve as a construction for the integration of plumbing installations. It is important here that the opposite studs are connected by tabs in order to achieve sufficient stability.

Build your own bathroom: bathrooms in the drywall system: build

For planking the drywall in the bathroom water-repellent impregnated plates must be used.

Build your own bathroom: bathrooms in the drywall system: bathrooms

Joints and screw holes must be filled with a leveling compound, if possible in accordance with the system of the same manufacturer.

Basically, in the wall structures described the planking to be positively connected to the floor construction. The planking of the walls usually consists of a double layer of gypsum plasterboard (2 x 12.5 mm) or only one layer with a thickness of at least 20 mm.

When choosing these types of planks, the required stand distance of 62.5 mm can be maintained. For plasterboard planking of lesser thickness, a significantly reduced stand spacing is required to produce a sufficiently rigid substrate for ceramic tiles.

In addition to the stable mounting of the stand construction, the actual surface of the planking and its filling pay particular attention. Because depending on the existing edge formation of the planking different Verspachtelungssysteme can be performed with or without Fugendckstreifen.

Basically, protruding filler material must be removed or repelled; A smoothing of the filler as well as surface application or the lateral distortion of the filler over the actual joint area addition, should always be avoided.

In practice: seal the wall step by step

Before starting work, check the surface for suitability. In addition to the usual drywall, such as plasterboard, gypsum fiber and gypsum wallboard, the following substrates are suitable:

  • concrete
  • Hand and machine plaster based on gypsum, cement or gypsum cement
  • Building panels made of cellular concrete
  • Hollow wall panels made of lightweight concrete

Not suitable are lime plasters and lime-plaster plasters. Their structure is not strong enough for a durable seal.

Concrete surfaces are just as suitable on the ground as cement, flow and poured asphalt screeds. More on the subject of floor sealing can be found below on this page.

Material and tools

  • Brushable bath seal (liquid foil)
  • sealing tape
  • paint Roller
  • brush
  • Plastic spatula or wooden spatula
  • Possibly. solvent-free underground
  • Possibly. Repair Putty

Prepare the wall for sealing

First, clean the surface of any loose components, such as dirt, dust or gypsum bricks. Also release agents, such as fats, are to be eliminated. A drywall must be clean and leveled, with other walls close damage, dowel holes and the like with a repair filler. Tile adhesive is also suitable for this purpose. Heavily or very differently absorbing substrates are treated with a solvent-free substrate to regulate the absorbency.

Then you injected, so far not yet done during construction, corner, connection and movement joints with silicone. Also fittings are sealed so. Here, however, only neutral-crosslinking silicone may be used in order not to endanger the metal surfaces by corrosion.

Apply waterproofing

With the application of the Abdicht-painting you start in the corners, at edges and transitions. Here it is best to work with the brush. Then the surfaces can be processed with the roll. Apply full coverage everywhere and always work wet-on-wet. If you do not want to paint the entire wall in each case, the sealant must cover the wall in the shower cubicle at least 30 cm above the shower head or above the bathtub to at least 20 cm above the bath filler tap.

In the corners and on connections to sanitary objects you put the paint tape belonging to the painting in the freshly applied liquid film. Be sure to use paint and sealing tape from the system of the same manufacturer. Then you can be sure that both can be easily processed together.

Also around pipe ducts around sealing tape is inserted into the mass. You can cut cuffs from the tape by adding a star-shaped cut to a piece of tape, but you can also buy ready-to-use cuffs.

Build your own bathroom: bathrooms in the drywall system: bathrooms

In the corners and connections, the sealant is applied with a brush. The roll is used on the surface.

Build your own bathroom: bathrooms in the drywall system: bathroom

Cuffs for pipe feedthroughs are available on many systems. You can also cut them from sealing strips.

Build your own bathroom: bathrooms in the drywall system: bathroom

Special sealing tapes with integrated sound insulation strips are also available for sealing connections between the bathtub and the wall.

With a suitable, non-sharp object, press the tape smoothly into the corner or around the bushing, making sure it fits snugly everywhere.

Let the first coat dry according to the manufacturer's instructions. The dry season is usually a few hours. Then follows the second coat. At first cover the sealing tape with the edges and then all other surfaces.

After the second coat has dried - again as prescribed by the manufacturer - the final wall covering can be applied: Tiles laid with a highly flexible tile adhesive ensure a perfectly watertight surface, even in heavily soiled areas such as the shower or over the bathtub,

Tip: sealing on old tiles

You also have to seal off an old tile floor that needs to be covered because most people do not know what it looks like underneath. But a little more preparatory work is required. First, the tiles are cleaned with a teat or other alkaline detergent. Such cleaners can be found in the hardware store mostly in the paint department. Then fill the tiles with highly flexible tile adhesive so that the joints are filled and a flat surface is created. On this surface, you can continue to work after drying the adhesive as described above.

Floor constructions - tiles and waterproofing

Build your own bathroom: bathrooms in the drywall system: drywall

In most cases, you will find a wooden beamed ceiling covered with chipboard in the attic of a private home. This ground oscillates to a small extent and expands or contracts due to fluctuations in humidity (especially in summer / winter seasonal changes). Because of these natural movements, it is initially unsuitable for receiving a hygienically flawless and easy to clean tile covering.

In order to "decouple" the rigid tile covering from the flexible substrate, various manufacturers offer "decoupling mats", e.g. from a polyurethane-bound rot-free coconut fiber. The same mats are mainly offered as footfall soundproofing mats.

The tiles are laid with flexible tile adhesives on this surface. This ensures a permanent bond of the tiles to the ground, as the movements of the ground are not hindered.

Ceramic coverings in dry construction

For over 10 years, the seal has been proven in practice in direct bonding with ceramic coverings. This sealing technology is economical, easy and safe to process, especially in areas subject to humidity.

Pipe penetrations, tub connections, etc., but also corners make special demands on the seal. Such areas must be separately sealed separately before surface sealing, since they affect the functionality of the entire sealing measure. So silicone joints are basically not a permanent seal, as they are subject to wear (for example, by intensive cleaning), can be solved over time at the edges and thus water can penetrate into the ground.

Build your own bathroom: bathrooms in the drywall system: drywall

To increase the reliability of the execution, it is recommended to carry out joint sealing generally in two operations. Begin in the room corners, e.g. in the area of ​​a shower corner in the connection floor / wall and wall / wall. Here is elastically and permanently bridged with highly elastic plastic sealing bands, which are provided with a Vlieskaschierung.

The sealing tapes are embedded in a previously applied fresh layer of the sealing compound and covered in the edge area with the liquid foil again. Existing movement joints are to be sealed in the same way. In this case, a loop should be formed in the Abdichtbändern that can absorb movements.

Sealing the raw concrete ceiling

Always pay attention to the surface

Build your own bathroom: bathrooms in the drywall system: your

Execution of the seal with the arrangement of the tub on the floating screed; the process on decoupling mats is carried out in a comparable manner.

Pipe penetrations in drywall must be carefully secured with a sealing collar. The materials are to be processed so that they can be seamlessly integrated into the subsequent surface seal. Processes are embedded directly in the liquid foil. The installation of baths and / or shower trays is often done on a raw concrete floor or on the screed.

To prevent damage, the surface seal under the respective tub is to be carried out. If the tub is located directly on a raw concrete floor, the seal must be raised again to the floating screed. In addition, at the same time the footfall sound insulation is to be bridged. This can only be realized with considerable effort.

In the case of an unfinished concrete floor, setting up the trough on the floating screed is the better solution from the point of view of practicability and sealing technology. In this variant, the seal can be guided out of the wall area via joint tapes on the floating screed and be continued in a plane below the tub to the rest of the floor area.

Depending on the type, additional wall brackets are required to support the tub when connecting to drywall constructions. To avoid structure-borne sound transmissions, special wall edge profiles or the use of insulating strips are recommended.

After sealing the details, the sealing of the entire surface follows. On the through-dried surface sealing, the ceramic coating is laid with a flexible thin-bed mortar. For the grouting of ceramic tiles, colored joint mortars have prevailed, giving each bathroom a special touch. The movement and connection joints are closed with elastic, fungicidal and bactericidal (fungicidal) silicone sealants.

Build your own bathroom: bathrooms in the drywall system: build

Already used by professionals: two-component tile adhesives, which also serve as a seal.

Build your own bathroom: bathrooms in the drywall system: your

For delicate surfaces such as beamed ceilings, a decoupling sheet is laid before laying the tiles. However you build the floor seal, it will be pulled up a little bit by the wall as a tub (see photo on the left).

Tips: Apply waterproofing to the floor

If you want to seal the floor of the bathroom as part of a renovation, you can also fill this area first. As a result, it is not only possible to close joints in old coverings, but with the appropriate mass, a slope can also be created or optimized.

If you do not connect the floor seal to a wall seal via a sealing tape in the corners, it must be trough-shaped and raised at least 15 cm from the walls.

Also on the ground, you should regulate the absorbency of the substrate, if necessary with a Tiefgrund job. In addition, as on the wall, the surface must be free of loose components and separating substances. The painting itself is basically the same as on the wall - pay close attention to the manufacturer's instructions.

Conclusion to bathrooms in drywall

The dry construction technology in bathrooms is given great attention by DIYers. Associated with this is that moisture-sensitive gypsum building materials are used as laying substrates for ceramic coverings for reasons of uncomplicated processing. Modern technology such as sealing in direct bonding with ceramic coverings provides the necessary protection against moisture damage in the home.

When using the dry construction, special attention must be paid to the careful training of details. Only then can the wall constructions in the bathroom be sealed securely.

Important technical terms for drywall

Liquid film tapes and sleeves are made from a highly elastic synthetic rubber applied on both sides to a permeable nonwoven fabric made from extremely durable and durable polyester. The permeable nonwoven is uncoated at the edges to form a strong bond with the liquid film. The incorporation of the bands and sleeves at the transitional areas is required, since movements can occur in these areas which could exceed the extensibility of the liquid foil and thus lead to tearing.

Flexible Tile AdhesiveThis is an adhesive that contains plastic parts in addition to various types of cement. By adding plastics to the cement, the adhesive is able to absorb minor movements without the tiles separating from the substrate. A further development are so-called "dispersion adhesives" that no longer contain cement and are based only on plastics.

Structure-borne sound body sound arises when sound is transmitted through the touch or the collision of two objects (eg: striking with a stick on a metal railing, which can continue over long distances). Airborne sound is caused by the reflection of sounds on solid objects (eg the echo in the mountains).

Fungicidal silicone sealantsDust particles present in the ambient air, remains of personal care products and also washed-off skin residues and hair, which after bathing orShowers in the corners stop and can never be completely removed, forming ideal food bases for bacteria and fungi. Mineral Fugenfüller are largely resistant due to the pH against colonization. Silicones must first be rendered resistant by a fungicidal equipment against colonization. However, this fungicidal effect decreases with time.


  • Trade Association of the German Tiling Industry in the Central Association of the German Building Trade e. V.: Hints for the execution of seals in conjunction with linings and coverings of tiles and panels for indoor and outdoor use, Bonn, May 1997.
  • Technical data sheets Heidelberger Bauchemie GmbH, brand Bauta

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