Schluter linear drain: a high-performance solution for a contemporary shower
- Samuel Provencher
- Jul 21
- 9 min read
The Schluter linear drain is often chosen for its discreet appearance and its ability to blend into contemporary showers. Placed along a wall or at another location determined during the design phase, it replaces the traditional point drain and collects water along a line rather than at a single point.
However, its appeal is not limited to aesthetics. A linear drain can simplify slope creation, facilitate the use of certain tile sizes, and contribute to the creation of a threshold-free shower.
These benefits depend entirely on the quality of the design and installation. The drain must be coordinated with the plumbing, structure, floor slope, waterproofing membrane, and wall covering. It should therefore be considered as a component of a complete shower system, and not simply as a decorative accessory.
What is a Schluter linear drain?
Schluter offers various drainage systems for tiled showers. Among them, KERDI-LINE is a linear drain designed to be integrated into a bonded waterproofing assembly.
Unlike a central drain, where water comes from multiple directions, a linear drain collects water over a greater length. This configuration generally allows the shower floor to be built with a main slope directed towards the drain.
The system comprises several elements that must work together:
the body of the drain;
the connection to the plumbing;
the sealing flange;
the membrane;
the grid support;
the grid or the tileable panel;
the base and slopes of the shower.
Continuity between these components is essential. A quality drain cannot compensate for a poorly constructed slope or an incorrectly connected membrane.
What is the difference between a linear drain and a central drain?
The central drain is installed at a specific point on the floor. To direct the water to it, the shower base usually has several sloping planes that converge at this point.
This configuration is well-suited to small-format tiles, which more easily adapt to changes in slope. With large tiles, it may require more cuts.
A linear drain typically directs water along a single slope. This feature offers greater freedom in tile selection and produces a more visually uniform surface.
However, a linear drain is not automatically preferable. The choice must take into account:
of the floor structure;
of the position of the drain pipe;
the dimensions of the shower;
of the type of tiling;
of the location of the entrance;
of the plumbing configuration;
of the desired aesthetic result.
In some renovations, preserving or repositioning a point drain remains the most consistent solution.
The main advantages of the KERDI-LINE drain
A discreet visual integration
The drain's elongated shape blends seamlessly with the tile lines. Depending on the chosen grid, it can become a decorative element or blend in very discreetly.
A tileable finish allows, in particular, the integration of the same covering as the flooring. Only a peripheral opening remains visible to allow water to pass through.
A simplified slope
With a drain placed correctly, the floor can usually be sloped in only one direction. This uniform slope simplifies tile layout and minimizes changes in plan.
However, it must be calculated and executed with precision. A nearly flat surface or a reverse slope can lead to water accumulation.
Better compatibility with large tiles
Large tiles are difficult to adapt to the multiple slopes of a central drain. A unidirectional slope often allows for the use of larger tiles in the shower.
The choice of format must nevertheless take into account the adhesion of the coating, the arrangement of the joints and safety when the floor is wet.
A solution suitable for barrier-free showers
The linear drain is frequently used in threshold-free showers . Its configuration can facilitate the creation of a continuous transition between the shower and the rest of the bathroom.
The absence of a threshold, however, necessitates rigorous water management. The drain, slope, glazing, and faucet placement must all be designed together to prevent splashing outside the shower.
Several location options
Depending on the model and project conditions, the drain can be placed against a wall or at a certain distance from it.
Its location must be determined before the floor preparation. It influences the slope, tile cuts, plumbing connections, and waterproofing details.
KERDI-LINE or KERDI-LINE-VARIO?
Schluter offers, in particular, the KERDI-LINE and KERDI-LINE-VARIO ranges. They cater to different configurations.
KERDI-LINE
KERDI-LINE is available in various predetermined lengths and with several grid styles. It can be installed along a wall or in an intermediate position, depending on the chosen design.
This solution is advantageous when the dimensions of the shower and the location of the drain are precisely established from the planning stage.
KERDI-LINE-VARIO
KERDI-LINE-VARIO offers greater flexibility regarding the length of the visible channel. Certain elements can be adapted on-site to the project dimensions, in accordance with the manufacturer's guidelines.
This flexibility can be useful in a custom-designed shower. However, it does not diminish the importance of precise floor preparation and plumbing connections.
The choice between the two systems should be made according to the actual configuration of the shower, and not solely according to the appearance of the grate.
Where should the linear drain be positioned?
Along the wall
The wall-mounted installation creates a very clean shower surface. The water is directed towards the back or to one side of the shower, depending on the configuration.
This position often facilitates the use of large tiles, but requires particularly precise execution of the connection between the drain, the wall and the membrane.
Near the entrance
A drain placed near the opening can help intercept water before it reaches the rest of the bathroom. However, this configuration must be carefully considered to avoid an uncomfortable area or uncontrolled drainage.
In an intermediate position
The drain can also be installed at a certain distance from the wall. This option creates slopes on either side of the channel and influences the tile layout.
No position is universally best. The best location depends on the water flow, the structure, and the overall design of the shower.
Linear drain and waterproofing
Tiles and grout alone do not make a shower waterproof. Water can seep through the joints and reach the underlying layers. The primary protection comes from the membrane behind the wall covering.
The KERDI-LINE drain is designed to be integrated into a bonded waterproofing assembly. The membrane must be correctly connected to the drain flange and extend over all exposed surfaces.
Particular attention must be paid to:
at the corners of the shower;
at the joints between the floor and the walls;
to plumbing passages;
to the niches;
to the benches;
at the entrance to the shower;
at the junctions around the drain.
The components of a system must not be arbitrarily assembled with incompatible parts. The manufacturer's instructions must be followed to ensure a continuous seal.
The slope remains essential
A linear drain does not draw water away and does not correct an uneven floor slope. The water moves towards the drain due to the slope of the base.
This slope must be even and correctly oriented. An error can cause:
persistent puddles;
slower drying;
deposits around the drain;
a migration of water towards the inlet;
premature deterioration of the finish.
In a walk-in shower, the slope must also be coordinated with the height of the adjacent floor. This coordination may require structural modifications or special preparation of the base.
Can a Schluter drain be installed during a renovation?
Yes, but feasibility depends on the existing structure.
In an older house or building in Montreal, several constraints can influence the project:
the available depth under the floor;
the direction of the joists;
the location of the drain pipe;
the thickness of the subfloor;
the old plumbing installations;
the height of the adjacent floor;
access to the spaces located under the bathroom.
Moving the drain may require a modification to the plumbing.
The embedding of the base can also affect the floor structure.
A preliminary inspection helps to confirm whether the drain can be placed in the desired location or if the design needs to be adapted to existing conditions.
What type of tile should be used with a linear drain?
The linear drain opens up more possibilities, but not all coverings are automatically suitable for a shower floor.
The choice must take into account:
adhesion when the surface is wet;
compatibility with the slope;
the arrangement of the joints;
ease of maintenance;
the thickness of the tile;
the height of the grid;
the precision of the cuts around the drain.
Large tiles can create a uniform result when the slope develops on a single plane. Mosaics or smaller tiles can also be used, particularly when increased grip is desired.
If a tileable grid is chosen, the pattern and joints must be carefully aligned so that the drain integrates with the floor.
How do you maintain a linear drain?
The removable grid allows access to the drain channel to remove hair, soap residue and other deposits.
The frequency of maintenance varies depending on shower usage. It is best to intervene before the drainage slows down or an odor develops.
Routine maintenance mainly consists of:
remove and clean the grill;
remove accessible debris;
clean the channel with a compatible product;
rinse the surfaces;
check that the water is draining normally.
Highly abrasive or unsuitable finishing products can damage the grille. The manufacturer's maintenance recommendations must be followed.
A slow flow that persists after accessible cleaning may indicate a problem further along the pipe. A professional inspection is then recommended.
How much does it cost to install a Schluter linear drain?
The cost of the product represents only part of the project. An installation may also require plumbing, structural, waterproofing, and tiling work.
The budget depends in particular on:
of the model and length of the drain;
of the chosen grid;
from the position of the existing pipe;
modifications to the floor;
the dimensions of the shower;
of the sealing system;
tiling;
the complexity of the cuts;
accessibility of the construction site.
It is therefore more relevant to assess the cost of the complete shower than to compare only the price of the drains. An estimate made after an inspection allows for the inclusion of the work actually required.
Mistakes to avoid
Choosing the drain too late
The model, length, and location of the drain influence the plumbing, base, slope, and tiling. These must be determined before work begins.
Buying a drain without checking the plumbing
The position and characteristics of the existing pipeline may limit the possibilities. A poorly planned relocation can significantly increase the scope of the work.
Believing that the drain replaces the slope
The drain collects the water, but the slope leads it there. These two elements are inseparable.
Mixing incompatible components
Sealing depends on the continuity of the system. Membranes, fittings and accessories must be compatible and installed in accordance with applicable requirements.
Neglecting the thickness of the tiles
The height of the grid must correspond to the surface covering and its bedding layer. Poor coordination can leave an uncomfortable edge or impede drainage.
Install a hard-to-reach gate
The channel must remain accessible for maintenance. Aesthetic integration must not prevent the removal of the grate.
Why choose a professional installation?
Installing a linear drain requires precise coordination between several steps. A mistake made at the beginning may become invisible after the tiles are laid and only become apparent later.
A specialized team can:
verify the feasibility of the project;
determine the correct location;
coordinate the plumbing and the structure;
create a suitable slope;
ensure the continuity of the seal;
adjust the grid to the tiles;
Check the flow before finishing.
BonBain Construction incorporates drainage into its bathroom renovation projects. The drain selection is made based on the room, the shower, and the building's constraints.
Installing a Schluter linear drain in Montreal
The KERDI-LINE drain can produce an elegant and functional result when integrated into a cohesive design. Its success relies as much on the concealed work as on the visible finish.
Before selecting a length or grid, you must examine the structure, plumbing, slope and waterproofing of the future shower.
To have your project assessed, consult BonBain Construction's drain installation and replacement service. Our team works in Montreal and the surrounding areas to integrate drainage into a complete and sustainable renovation.
Contact BonBain Construction to discuss your bathroom.
Frequently Asked Questions about Schluter Linear Drains
Does the KERDI-LINE drain necessarily have to be installed against a wall?
No. Depending on the model and design of the shower, it can be installed along a wall or in an intermediate position.
Can large tiles be used with a linear drain?
Yes. The ability to create a slope in only one direction often makes it easier to use large formats. However, the coating must be suitable for wet surfaces.
Is a linear drain suitable for a shower without a threshold?
Yes, it is frequently used in this type of shower. However, the structure, floor height, and water management must be studied before work begins.
Does a Schluter drain make the shower waterproof?
No. The drain is part of the system, but the seal also depends on the membrane and all its connections.
What length of drain should I choose?
The length depends on the dimensions of the shower, its location, and the composition of the tiles. It must be determined during the design phase.
Is a linear drain more efficient than a central drain?
Both can effectively drain water when properly sized and installed. The linear drain is distinguished primarily by its configuration, unidirectional slope, and aesthetic integration.
Comments