Linear Drain Installation — Tile Work in Warsaw

A linear drain is the heart of a curbless shower. Viega Advantix, Geberit, Alcaplast — all require precise installation in the screed, correct slope, watertight waterproofing and careful tile cutting around the drain. This is not just plumbing — it is a full tiling package: slope formation, tile laying with exact drain junctions, edge treatment and sealing. A mistake at any stage means puddles on the floor or a leak to the neighbours below. We work across Warsaw — from Mokotów to Bielany. Planning a walk-in shower with a linear drain? Call us for a site survey and a full-package quote.

How much it costs and what affects the price

The cost depends on drain length (50-100 cm), type (tile-insert, grate, slot), whether the screed needs reworking, waterproofing scope, tile area and cutting complexity around the drain. Installation in an existing screed is simpler than starting from scratch. Large-format tiles at the drain require precision cuts — more expensive than small format. Fixings and consumables are included. The drain, tiles, adhesive, grout and waterproofing are purchased by the client. Current prices are in the table below.

How installation and tiling work

1. Survey and planning. We determine drain position (wall, centre, diagonal), check screed height and waste pipe location. We calculate slope — minimum 1-2% towards the drain line from all sides.
2. Substrate preparation. If the screed is too thin we build it up. We chase a channel for the waste pipe and lay a 50 mm pipe at a minimum 2 cm/m fall to the stack.
3. Drain body installation. Viega Advantix, Geberit or Alcaplast — fixed in the screed, set to the correct height accounting for adhesive and tile thickness. Connected to the waste pipe. Leak tested.
4. Waterproofing. Mapei Mapelastic liquid membrane on floor and walls (minimum 15-20 cm). Special attention to the drain-to-screed junction: sealing tape plus mastic. Tape on all corners and wall junctions.
5. Slope formation. We pour a screed with fall towards the drain using guide rails. Checked with a straight edge — water must flow evenly from all points to the drain line.
6. Tile laying. We start from the drain towards the walls. Cutting around the drain is the critical step: a 2-3 mm gap filled with silicone. On large-format tiles the cut must be perfectly straight — Rubi or Montolit with a diamond blade.
7. Grouting and sealing. Joints — epoxy or hydrophobic grout. Tile-to-drain junction — Ceresit CS 25 sanitary silicone. Wall junction — silicone too. Final test: flood and verify drainage.

Common mistakes with linear drain installation

• Insufficient slope — water pools near the drain. The fix is a complete screed rework.
• Drain not level — the grate sits above or below the tile surface.
• Poor waterproofing at the drain junction — this is where 80% of leaks originate. Tape plus mastic is mandatory.
• Waste pipe without fall — slow drainage, dirt build-up, odour from the drain.
• Rough tile cuts around the drain — uneven gaps look messy and are hard to seal.
• Rigid adhesive at the drain junction — thermal movement lifts tiles. The drain junction must be silicone only.
• No trap with water seal — sewer odour in the bathroom. Viega and Geberit have built-in seals — always verify.
• Screed too thin — not enough height for the pipe, drain body and slope. The entire floor must be raised.

Important: a linear drain combines plumbing, waterproofing and tiling. A mistake at any stage can cause a leak to the flat below. If you have no experience specifically with linear drains, we strongly recommend hiring a specialist.

What to prepare before the technician arrives

• Linear drain purchased: Viega Advantix, Geberit or Alcaplast — confirm model and length with the technician.
• Waste pipe outlet prepared (or the technician will chase one).
• Waterproofing: liquid membrane (Mapei Mapelastic, Ceresit CR 166) plus tape.
• Tiles purchased with 10-15% spare.
• Flexible adhesive (Ceresit CM 17, Mapei Keraflex).
• Epoxy or hydrophobic grout.
• Sanitary silicone (Ceresit CS 25).
• Check screed thickness — it determines the scope of work.
• Clear the bathroom completely.
• Ensure access to the waste stack and shut-off valves.
• Power and water supply nearby.
• Provide access details: intercom, lift, parking.

A real case from Warsaw

A new-build apartment in Wilanów, 6 m² bathroom — the client wanted a walk-in shower with a Viega Advantix Vario 70 cm linear drain at the wall. The screed was thin (4 cm) and the waste outlet was in the opposite corner. We chased a channel across the entire bathroom and laid a 50 mm pipe at 2 cm/m fall. The drain was set flush with the future tile surface. Waterproofing — two coats of Mapei Mapelastic with sealing tape on all junctions. Screed poured with fall using guide rails. Tiles — Paradyż 60×60 cm porcelain, cut around the drain on a Rubi with a diamond blade. The 3 mm gap was filled with Ceresit CS 25 sanitary silicone. Grout — Mapei Kerapoxy. The job took four days: one day for plumbing and waterproofing, one for screed (plus drying), two for tiles and grouting. The client noted that water drains instantly from the entire shower area — no puddles anywhere. Takeaway: a linear drain demands a holistic approach, and cutting corners on waterproofing is the most expensive mistake you can make.

Frequently asked questions

Who does the work

Linear drain installation with the full tiling package is carried out by technicians experienced specifically in shower zones — combining plumbing, waterproofing and precision tiling. We arrive with an electric tile cutter, diamond blades, chasing tools and a complete waterproofing kit. We cover all of Warsaw and nearby suburbs. Call or message us — we will visit for a survey and quote the full package.

A linear drain means a shower with no tray and no step: water flows straight into the floor through a long slot drain. It looks sleek, works well for people with limited mobility and is easy to clean. But fitting one is nothing like installing a regular shower tray. You need a properly graded screed, reliable waterproofing and a precise connection to the waste pipe. In new builds on Wilanow, flats on Mokotow, houses in Zoliborz — every building has its own floor conditions and screed depth. If you are planning a tray-free shower, call a professional for a site survey. We install linear drains regularly and know where mistakes are most commonly made.

How much does installation cost

The price depends on the drain length, construction type (tile-insert, grated or slot), the existing screed thickness, whether it needs rebuilding and the extent of waterproofing. If the screed is thin you may need to raise the entire floor level or chase a channel for the waste pipe. Installing a drain in a finished bathroom is harder than during a full renovation. Current prices for all bathroom work are in the table below. Fixings and sealant are included; the drain unit and waterproofing materials are supplied by the client.

How the installation works

1. Survey and planning: we determine the drain position, check screed depth, locate the waste outlet and calculate the gradient (at least 1–2 % towards the drain).
2. Base preparation: if the screed is too thin we build it up. We chase a channel from the drain location to the waste stack for the pipe.
3. Laying the waste pipe: we install the pipe at the correct gradient (at least 2 cm per metre) and connect it to the stack.
4. Setting the drain body: we fix it in the screed at the right height, allowing for future tile and adhesive thickness, and connect it to the waste pipe.
5. Waterproofing: we apply liquid membrane to the floor and walls (at least 15–20 cm up), paying special attention to the joint between the drain and the screed. Waterproofing tape is used at corners and junctions.
6. Forming the gradient: we pour a screed that falls towards the drain from every direction and check with a spirit level.
7. Testing: we flood the area with water, check the flow rate and inspect every joint for leaks.

Common mistakes

• Insufficient screed gradient — water pools on the floor instead of flowing to the drain. The only fix is to redo the screed.
• Poor waterproofing — water seeps through the screed and reaches the flat below. The most expensive mistake possible.
• Wrong drain height — after tiling, the grate sits above the floor or is recessed too deep.
• Screed too thin — not enough depth for the pipe and gradient, forcing the entire bathroom floor to be raised.
• Waste pipe with no gradient — water drains slowly, debris collects and the bathroom starts to smell.
• No waterproofing tape at junctions — this is where leaks most commonly begin.
• Drain installed without a trap with a water seal — sewer odour comes straight into the room.

Important: a linear drain involves floor waterproofing and drainage. A fitting error means a leak to the flat below and an expensive repair. If you have no experience with this type of work, we strongly recommend calling a professional.

What to prepare before the visit

• Buy a linear drain of the right length (50, 60, 70, 80 or 100 cm) — confirm the model with the technician beforehand.
• Find out the screed thickness in your bathroom — this determines whether the floor needs raising.
• Locate the waste stack and outlet — take a photo for discussion.
• Buy waterproofing supplies (liquid membrane and tape) — the technician will advise on brand and quantity.
• Clear the bathroom completely — the work is dusty and messy, and the entire floor must be accessible.
• If the bathroom is already tiled, let us know — the floor tiles in the shower zone will need to come up.
• Ensure access to the waste stack and shut-off valves.
• Check whether your downstairs neighbour has a sensitive ceiling — this matters for waterproofing.
• Keep in mind: after fitting the drain, the screed needs 1–3 days to cure before tiles can be laid.

A real case from Warsaw

We were called to a new-build flat on Wilanow. The owners wanted a tray-free shower zone with a 70 cm linear drain along the wall. The floor screed was 8 cm thick and the waste outlet was 1.5 m from the intended drain position. We chased a channel for the pipe and laid it at a 2.5 cm-per-metre gradient. The drain body was set at the correct height, allowing 10 mm for tile and 5 mm for adhesive. Liquid waterproofing was applied in two coats across the entire shower floor and 20 cm up the walls. Waterproofing tape went on every junction. We poured a graded screed and checked the fall from four sides with a spirit level. Two days later we ran a flood test — water drained evenly, not a single puddle, every joint bone dry. The tiler then laid tiles flush with the drain grate. The result: a flat, step-free shower with flawless drainage.

Frequently asked questions

Book the installation

We install linear drains across Warsaw — in new builds and older properties, during renovations and in finished bathrooms. We visit for a survey, calculate the gradient and height, and fit the drain with full waterproofing. Get in touch — we will discuss your project and arrange a date.