Linear drain or central drain: which to choose for your shower?
- Samuel Provencher
- 16 hours ago
- 8 min read
Two effective systems that do not meet the same constraints
The drain influences the shower's appearance, the tile size, and the floor slope. A linear drain typically creates a slope in only one direction, while a central drain receives water from multiple slopes.
However, a linear drain is not automatically superior to a central drain. The choice depends on the position of the existing drain, the floor structure, the desired flooring, and the budget allocated to the shower.
Before making a decision, the entire system must be examined: drain, plumbing, slope, waterproofing membrane and ceramics.
How does a central drain work?
The water converges towards a point located in the floor
The central drain, also called a point drain, is the traditional solution. It can be installed at the geometric center of the shower or slightly off-center to accommodate the existing plumbing.
The floor is shaped to direct water towards this point from several directions. It therefore generally forms four inclined planes, comparable to the very light faces of an inverted pyramid.
This geometry is particularly well achieved with:
of the mosaic;
small square tiles;
hexagonal tiles;
some small pebbles or coatings.
Smaller tiles follow slopes more easily without creating jagged edges. They also offer a large number of joints, which can improve traction underfoot when the ceramic and grout are suitable for this purpose.
What are the advantages of a central drain?
A simple, proven and often economical solution
The central drain remains relevant in many renovation projects. It is compact, discreet, and compatible with several waterproofing systems.
Its main advantages are:
a purchase cost generally lower than that of a linear drain;
a well-known installation among professionals;
a compact grid;
a relatively simple interview;
good compatibility with prefabricated shower bases;
several finishes and grid designs;
the possibility of retaining the location of an existing drain.
When an existing drain is already in place and the structure does not present any particular difficulties, keeping it can reduce the extent of plumbing modifications.
Modern models are not necessarily rudimentary. There are point drains with an integrated flange , with various metal grates or tileable supports that make the drain more discreet.
What are its limitations?
The multiple slopes influence the choice of ceramics
The main drawback of the central drain stems from the floor's geometry. The slopes converge at a single point, complicating the use of very large tiles.
A large, rigid tile cannot conform to multiple orientations simultaneously. It would then have to be cut along the slope lines, which can produce very visible diagonal joints or differences in level between the pieces.
Mosaic tiles are easier to install, but they also mean more grout to clean. Therefore, the quality of the grout and the installation itself is important to minimize maintenance.
The central drain can also be more visually striking when it contrasts sharply with the floor. However, a grate that matches the faucets or a tileable model can help integrate it more seamlessly.
How does a linear drain work?
A long drain placed against a wall or in the floor
The linear drain takes the form of a narrow channel. It can be installed along a wall, near the entrance, or in an intermediate position in the shower.
When placed against a wall, the floor can be laid as a single plane, slightly inclined towards the drain. This unique slope simplifies the use of large tiles and creates a visually more continuous surface.
Depending on the manufacturer and the system chosen, the drain can accommodate:
a full grid;
a perforated grid;
a finish matching the taps;
a support covered with the same ceramic as the floor.
Linear drains designed for watertight assemblies can be installed against a wall or inside the shower. Their unique slope allows, in particular, the use of large-format tiles.
Why choose a linear drain?
A solution suitable for continuous surfaces and large tiles
The linear drain is often chosen for its contemporary appearance. Installed against the back wall, it attracts little attention and leaves the shower floor almost entirely clear.
It offers several advantages:
a slope built in only one direction;
the possibility of using large tiles;
a visual continuity between the bathroom and the shower;
several lengths and finishes;
a grid that can be concealed under the ceramic;
good integration with open showers;
a possible installation against a wall.
In a minimalist bathroom, it avoids visually dividing the floor into several sections. The same tiles can sometimes be used in the shower, provided they are slip-resistant and compatible with the planned slopes.
A linear drain can also facilitate certain threshold-free shower projects. However, it does not guarantee their feasibility on its own.
Does a linear drain still allow for a threshold-free shower?
The drain alone does not solve the problem of height
A walk-in shower requires sufficient space to accommodate the drain, create the slope, and connect the waterproofing membrane. Therefore, the available floor height remains a crucial factor.
We need to check:
the thickness of the floor;
the height of the joists;
the position of the drain pipe;
the possibility of lowering the shower area;
the bathroom floor level;
access to the plumbing from below.
A low-profile linear drain can simplify design, but it doesn't eliminate these constraints. In some buildings, a small threshold remains necessary even when a linear drain is chosen.
Conversely, a threshold-free shower can also be achieved with certain central drains and adapted base systems. The type of drain is therefore only one factor among several.
Where should a linear drain be placed?
Along the wall is often the most consistent option
The linear drain is frequently placed against the wall opposite the entrance. The floor then slopes down towards the back of the shower, limiting the risk of water flowing into the bathroom.
It can also be installed:
along a side wall;
in the center of the shower;
near the entrance;
between two zones of a humid room.
However, an installation near the entrance requires particularly careful design. The drain must intercept the water before it exits, without creating an uncomfortable obstacle underfoot.
The positioning also depends on the drain outlet. Even if the channel is long, its connection to the pipe is made at a precise point, centered or off-center depending on the model. This point must be able to be connected to the drain without weakening the structure.
Which drain is suitable for large tiles?
Linear drains generally offer more freedom
Large format tiles are not well suited to a floor with multiple slopes. However, they are suitable for a surface inclined in only one direction.
Linear drainage is therefore often preferred when the project includes:
large porcelain tiles;
a continuous pattern;
few joints;
a very clean appearance;
a continuity between the main floor and the shower.
The tile format must still be compatible with the slope and the required slip resistance in a wet area. A large, very smooth surface can become uncomfortable or slippery, even if it is aesthetically pleasing.
With a central drain, mosaic tiles generally remain the simplest choice. They allow you to follow the slopes without requiring multiple complex cuts.
Which system is the easiest to clean?
The visible grid represents only part of the maintenance
A central drain has a compact grate that can usually be removed to access the drain. Its small surface area makes it quick to clean.
The linear drain has a longer channel. It offers a large collection area, but requires lifting the grate and periodically cleaning the inside of the channel.
Some models include a basket or filter designed to trap hair.
The level of maintenance depends in particular on:
the length of the drain;
of the grid design;
of its accessibility;
the presence of a filter;
the number of users;
the frequency of cleaning;
products used in the shower.
A tileable grate can make the drain very discreet, but it is often heavier to remove than a small central grate. Aesthetics must therefore be weighed against ease of maintenance.
Does the linear drain remove more water?
The visible length alone does not determine the flow rate
A linear drain may appear to hold more water because it has a longer opening. However, its actual capacity depends primarily on its outlet, the discharge pipe, and the specific characteristics of the model.
The system must be chosen according to the flow rate produced by the shower, particularly when it includes:
a large rain apple;
a hand shower;
several bodily jets;
multiple outputs used simultaneously.
A longer drain does not compensate for insufficient or poorly connected pipework. The flow rate of the faucet and the capacity of the drainage system must be checked together.
Which drain is the easiest to install during a renovation?
The position of the existing drain may decide for you.
During a renovation, the theoretical choice must be compared with the existing plumbing.
If the existing central drain is well-positioned, installing a new one in the same location can minimize floor openings. The project then maintains a known drainage path.
A linear drain may require:
the displacement of the exit;
a change in behavior;
the opening of the subfloor;
adjusting the joists;
additional height;
a precise frame against the wall.
In an older bathtub, the drain is usually located near one end. This position can sometimes accommodate the off-center outlet of a linear drain, but this should be confirmed by inspection.
Moving furniture on a concrete slab or in a condominium can become much more complex. Condominium rules, the position of columns, and any potential work on the ceiling of the unit below must all be taken into account.
Which system is the most expensive?
A linear drain generally represents a larger investment.
A central drain is usually the most economical solution. Its purchase cost is lower and its installation can be simple when it matches the existing drainage system.
A linear drain can increase the budget due to:
the price of the gutter and its grate;
plumbing modifications;
precise preparation of the support;
of the length of the sealing fittings;
laying large tiles;
of the adjustment to the walls and the glass partition.
However, the cost does not depend solely on the type of drain. A central drain that is difficult to relocate can be more expensive than a linear drain installed close to the existing pipe.
The comparison should therefore focus on the complete system, and not on the price of the grid taken in isolation.
Compare the linear drain and the central drain
The project's priorities allow us to make a decision.
Criteria | Central drain | Linear drain |
Floor geometry | Several slopes | A possible slope |
Preferred ceramics | Mosaic or small tiles | Large or small tiles |
Appearance | Classic and compact | Contemporary and discreet |
Interview | reduced grid | Drain takes longer to clean |
Usual cost | More economical | Higher |
Installation during renovation | Simple if the drainage system is maintained. | Depends on the position of the output |
Walk-in shower | Possible depending on the floor | Often advantageous, but without guarantee |
Installation precision | Important | Very important along the entire length |
The central drain is particularly suitable when you want to control the budget, keep the plumbing and use a mosaic.
The linear drain becomes interesting when the design includes large tiles, a single slope, or an open shower with a very clean aesthetic.
Mistakes to avoid
A poor choice can complicate the entire shower construction.
The most frequent mistakes are as follows:
Choose the drain after the ceramic tiles.
The tile format must be coordinated with the geometry of the floor.
Decide solely based on appearance.
The position of the pipe and the structure can make the choice much more complex.
Confusing linear drain and automatically threshold-free shower.
The available height must always be checked.
Installing a drain that is too short or poorly proportioned.
The joints at the ends can become difficult to finish neatly.
Place the drain without planning for the glass wall.
The profiles, anchors and drain are likely to come into conflict.
Neglecting access for maintenance.
The grid and filter must be easily removable.
Mixing incompatible components.
The drain and the membrane must form a properly connected sealing system.
Underestimating the necessary precision.
A linear drain that is poorly aligned against a wall makes the defects immediately visible.
Have BonBain choose the drain
Adapt the system to the flooring, plumbing, and desired style.
The choice between a central drain and a linear drain should not be made separately from the rest of the shower. It influences the slope, the tiling, the waterproofing, the plumbing, and sometimes the floor height.
BonBain can examine the existing configuration, determine the feasibility of a threshold-free shower and compare the two solutions according to the actual constraints of the building.
To have your project evaluated, fill out the BonBain free estimate request .
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