Timber floor installations are becoming the most requested substrate for high end microcement wet rooms. The key is getting the build-up right: stiffness, waterproofing, and a shower zone designed to be coated.
For installers, the best results come from treating the floor as a system. A stable deck supports the room, a cementitious layer supports adhesion, and a purpose-built shower base makes falls and drainage predictable.
Timber Floors Can Be a Great Substrate When the System Is Right
Microcement performs best on rigid, stable, well prepared surfaces. Timber floors can deliver that standard when the build-up is designed for stiffness and waterproofing, not just thickness.
BS 5385 Part 1: 2018 points installers towards rigid, waterproof substrates in wet areas. On timber, that typically means: a properly fixed load-bearing deck, a cementitious layer for microcement bonding, and a shower area built as a single waterproof component.
A Practical Timber Floor Build-Up for Microcement
A solid timber wet room build-up is repeatable on site and easy to inspect before coating:
- Stiffen the structure where needed: suitable joist spacing, noggings, and a properly fixed deck
- Install 18 mm timer flooring, fixed to joists with appropriate centres
- Add 12 mm cement backer board in the room area, bonded and mechanically fixed
- Stagger joints and manage seams, ensuring a consistent surface for the microcement
This gives microcement a cementitious background in the main floor area, while keeping the whole room aligned with good wet room practice.
The Shower Zone Upgrade: Resin Rock Microcement Shower Trays
Purpose built microcement shower trays make timber floor wet rooms easier to standardise: the falls are built in, the drain area is engineered, and the substrate is designed specifically for microcement.
Resin Rock trays are built by microcement installers and focus on the details that matter on timber:
- Factory primed surface, ensuring maximum bond strength with microcement
- 100% waterproof construction, avoiding absorbent materials like wood (in line with British Standard 5385 part 1: 2018)
- Non porous, rigid base, creating a stable shower zone once installed
The result is a shower area you can prep and coat with confidence, while the surrounding build-up follows your usual timber wet room method.
Bespoke Sizing Keeps Timber Floor Work Simple
Timber floor wet rooms rarely land on “standard tray” dimensions. Bespoke sizing makes the install cleaner, keeping the structure sensible and the falls consistent.
Bespoke shower trays are made to suit your site dimensions, including drain position and layout. Each tray is precision cast with the fall towards the drain, removing the need for improvised screeds and site-built shaping on timber.
This saves time on each installation and gives a predictable substrate for the microcement system.
Linear And Round Drains Keep the Detail Clean
Linear and round drain shower trays are becoming the specified option for seamless microcement wet rooms, especially on timber floors where build-ups and penetrations need to stay controlled.
The drain channel is integrated into the tray during manufacture, creating one waterproof component that’s straightforward to insall and coat. The finished look stays clean: microcement runs continuously from the main floor into the drain line with no awkward transitions.
Explore linear drain shower trays designed specifically for microcement applications.
A Concise Installation Sequence on Timber
- Check joists and stiffen where needed, adding noggings or reinforcement to suit spans and centres
- Fix the deck properly, ensuring the floor is solid before any boards or waterproofing go down
- Set the tray on the prepared deck, supporting the perimeter and keeping levels consistent
- Run cement board across the room, tying neatly into the tray perimeter
- Prime and coat in one system, treating tray and floor as one microcement-ready substrate
This approach keeps the wet room build-up consistent, while making the shower zone predictable on every job.
Built by Microcement Installers, Designed for Repeatable Results
Resin Rock trays are manufactured by microcement installers. Each tray is made to support a consistent substrate standard: waterproof, stable, and ready to coat.
Every tray is:
- Factory primed for reliable bonding
- Bespoke sized to suit real site dimensions and drain positions
- Waterproof by construction, removing absorbent cores from the shower zone
Discover the full range of microcement ready shower trays and explore the fitting guides for timber floor sequences and substrate prep details.
