Shower waterproofing: reinforcing internal corners

Shower waterproofing: reinforcing internal corners

We continue waterproofing the shower in a real project. Today I'm showing how to reinforce the internal corners where walls meet the floor — this is the final stage before applying waterproofing to the floor.

📋 Series of articles on shower waterproofing:

  1. Part 1: Complete guide — materials and walls
  2. Part 2: Waterproofing plumbing outlets
  3. Part 3: Reinforcing wall-floor corners and floor application (you are here)

An important step before applying waterproofing to the floor is thorough cleaning. Vacuum, remove all irregularities and be sure to prime. After that, we proceed to reinforcing the internal corners.

Apply waterproofing sealant with a brush into the internal corner. We start from the middle of any wall.

Нанесение гидроизоляционной мастики кистью во внутренний угол стена-пол
Applying waterproofing sealant with a brush into the internal corner of wall-floor

Next, we take the reinforcement tape and prepare it for gluing.

Подготовка армирующей ленты для гидроизоляции углов душевой
Preparing reinforcement tape for shower corner waterproofing

By folding the tape in the middle, we carefully start gluing from left to right.

Внутренний угол — армирующая лента «конверт»
Internal corner — reinforcement tape "envelope"

And here's the most important difference: we don't cut the tape, but continue to apply it continuously along the entire length of the shower. In the internal corner, we make an "envelope" system, as shown in the photo above.

Now we apply waterproofing sealant over the tape and smooth the envelope in one direction.

Готовая армировка во внутреннем углу душевой
Finished reinforcement in the shower's internal corner

Next, we proceed the same way through the entire shower. We reach the starting point and make a 10 cm overlap.

Перехлёст армирующей ленты
Reinforcement tape overlap

External corners can be reinforced either with special ready-made inserts or done the way I do it.

Армировка наружного угла лентой
Reinforcing an external corner with tape

Next, using a roller, we begin applying waterproofing over the entire shower floor area. Apply the first coat generously to get an even layer.

After the waterproofing dries, repeat the operation. Keep in mind: with the correct application technique, consumption should be 1 kg of sealant per 1 m².

Нанесение гидроизоляции на пол валиком
Applying waterproofing to the floor with a roller

Also read from this series

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I have over 30 years of experience renovating spaces, and I share what I've learned on the site. Author of http://www.homeatelie.club
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