KV

Katiyar Ventures

Premium Paints

Wall Tiling

Waterproof Wall Tiling Systems

Waterproof wall tiling systems for showers, bathrooms, and kitchen splash zones — backer board, liquid membrane, and mould-resistant silicone joints specified for every installation in Kanpur.

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Understanding the System

What is a Waterproof Wall Tiling System?

A waterproof wall tiling system is not simply "tiles stuck on a wall." In wet areas like showers, bathrooms, and kitchen splash zones, the tiles and grout are a decorative surface — the true waterproofing comes from the layers behind the tiles: a stable, moisture-resistant substrate, a liquid-applied waterproof membrane, and correctly specified adhesive and grout.

The most critical element is the substrate. In shower enclosures, a 12 mm cement backer board is fixed to the wall framing or masonry before any tile work begins. Unlike plasterboard (which will swell and delaminate in contact with water), backer board has zero water absorption and provides a dimensionally stable base. Over it, a liquid waterproof membrane is applied before tiling — this is the layer that actually keeps water out of the wall cavity.

At all internal corners and change-of-plane junctions, mould-resistant silicone sealant replaces grout. These are movement joints — the wall and floor planes expand and contract at different rates in Kanpur's temperature swings, and cement grout at these junctions will always crack, allowing water ingress. Silicone, being permanently flexible, accommodates this movement indefinitely.

Signs Your Wall Tiling is Failing

  • ✓Grout cracks at internal corners or floor-to-wall junctions
  • ✓Tiles falling off the wall — adhesive bond failure
  • ✓Damp patch visible on the wall behind the tile area
  • ✓Water seeping through the wall into an adjacent room
  • ✓Shower wall feeling soft or hollow when pressed
  • ✓Black mould growing along grout lines despite regular cleaning

Our Process

Our 5-Step Approach

Five layers of protection — every one is essential. Skipping any layer is the reason most shower walls fail within five years.

01

Wall Preparation

Existing tiles or render hacked off. Wall surface inspected for hollow plaster, cracks, and active dampness. Any defective substrate filled and stabilised. Surface cleaned, primed with bonding agent to improve adhesion of the next layer.

02

Backer-Board or Render Coat

For shower enclosures and high-risk wet zones: 12 mm cement backer board screwed to the stud or masonry wall. For lower-risk areas: polymer-modified sand-cement render coat applied at 10–15 mm to provide a flat, plumb tiling surface.

03

Waterproof Membrane

Liquid-applied waterproof membrane painted over the backer board or render — two coats, with reinforcing tape at all inside corners and pipe penetrations. This is the true waterproofing layer; the tiles and grout are a decorative finish over it.

04

Tile Setting

Wall tiles set in C2T polymer-modified adhesive with back-butter technique for full contact. Large-format tiles (600×1200 mm) require T-class (non-slip) adhesive to prevent slump. Joints maintained at uniform width with plastic spacers.

05

Silicone Joints & Sealant

All internal corners, floor-to-wall junctions, and changes of plane finished with mould-resistant silicone sealant — never cement grout. These movement joints accommodate the differential thermal expansion of wall and floor tile planes without cracking.

Specified Materials

Products We Use

WetRoom Render Base

Polymer-modified sand-cement render for wet area wall preparation. Floated to a plumb, flat surface ready for tiling. Water-resistant formulation prevents moisture penetrating into the wall substrate even before the waterproof membrane is applied.

  • Bed thickness: 8–15 mm
  • Application rate: 1.5 kg/m² at 10 mm
  • Compressive strength: 15 MPa

Backer Pro Board

12 mm Portland cement-based backer board for shower enclosures and high-moisture wall applications. Unlike standard plasterboard or green board, Backer Pro Board has zero water absorption and will not delaminate, swell, or promote mould growth when exposed to continuous moisture.

  • Thickness: 12 mm
  • Water absorption: 0%
  • Weight: 12 kg/m²

SiliGlaze Pro

Neutral-cure, mould-resistant silicone sealant for all wet area movement joints. Remains permanently flexible, bonds without primer to ceramic, porcelain, marble, glass, and aluminium. The mould-inhibiting biocide is incorporated throughout the silicone — not just on the surface — for lasting protection.

  • Bond life: 20-yr rated
  • Available colours: 30+
  • Movement accommodation: ±25%

Why Choose Katiyar Ventures?

10-Yr

Warranty on Materials

500+

Projects Completed

Free

On-Site Inspection

100%

Waterproof Systems

Common Questions

Frequently Asked Questions

Do I need a cement backer board in all shower walls, or only some?+
Backer board is essential in continuous-spray zones — the wall area within 600 mm of a shower head, and the full floor-to-ceiling area of an enclosed shower enclosure. Outside this zone, in areas that only receive splashing (the rest of the bathroom wall, for example), a polymer-modified render coat over stable masonry is sufficient, provided a liquid waterproof membrane is applied before tiling. The most common failure we see is builders cutting corners with standard plasterboard in shower enclosures — it is never acceptable in wet areas.
What size tiles are best for shower walls?+
For Indian bathrooms (typically 1.2×1.5 m to 1.8×2.0 m), the most practical wall tile sizes are 300×600 mm or 400×800 mm — large enough to minimise grout lines (reducing mould risk) but manageable for vertical installation without specialist equipment. Very large format tiles (600×1200 mm and above) are increasingly popular for a seamless look, but require T-class non-sag adhesive, a perfectly flat substrate (tolerance ±3 mm over 2 m), and an experienced tiler — three conditions that are rarely all met simultaneously. We advise on size based on actual site conditions.
How often should silicone sealant in showers be replaced?+
Quality neutral-cure mould-resistant silicone (such as SiliGlaze Pro) has a service life of 15–20 years under normal use. However, in practice, silicone at movement joints can start to show mould growth, colour change, or cracking within 5–8 years if the original quality was poor, if the surface was not properly cleaned and primed before application, or if the joint width was insufficient to accommodate movement. We recommend inspecting all silicone joints annually and re-sealing any cracked or mouldy sections promptly — a failing silicone joint is the most common entry point for water behind wall tiles.
Can you tile directly onto plasterboard in a bathroom?+
Only standard plasterboard: absolutely not — ever, in any wet area. Even moisture-resistant plasterboard (green board or purple board) is not suitable for areas with direct water contact or high humidity. Both will swell, delaminate, and support mould growth. Backer board or a sound masonry/concrete wall with render is the minimum acceptable substrate for any tiled wet area. If you have existing tiles over plasterboard in your Kanpur home and are experiencing tile movement or mould, please contact us for an assessment before the problem causes structural damage.

Tiles Falling Off? Mould at the Grout Lines?

Book a free wall tiling inspection in Kanpur. We'll identify the substrate issue, recommend the correct system, and give you a clear quote.

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