Installation Guide
How to Install the Screedex® Mortar Bed Screed System
Follow this step-by-step guide to build mortar beds that are accurate, compliant, and faster to install.
Follow These Installation Steps
Step 1 — Subfloor Preparation
Ensure the subfloor is clean, dry, and free of dust or debris. A smooth, solid surface is essential for strong mortar adhesion and long-term screed performance.
Step 2 — Position Platforms
Place Screedex® platforms around perimeter edges, corners, and floor drains (e.g. strip drains or wastes). Keep spacing under 4ft to provide consistent support.
Step 3 — Secure with Adhesive
Apply adhesive to the base of each platform. Press firmly until adhesive seeps through the holes. Allow time to cure.
⚠️ Always follow local codes.
Step 4 — Set Your Slope Heights
Manually adjust the platform heights, or use a drill with a hex bit, to create slope from high point to drain. Example: a 1:80 slope equals a 2-inch drop over 13 feet.
Step 5 — Option 1
Check Slope Using a Spirit Level
Place a level across platform tops to verify slope direction.
Step 5 — Option 2
Check Slope with a String Line
Run a taut string line between platforms to visually confirm slope direction.
Pro-Tip: A laser level also helps you quickly confirm that your reference heights are correct, so you can install your screed with confidence.
Step 6 — Add Reinforcement
For reinforced screeds, clip reinforcement holders onto platforms. This elevates wire mesh above the subfloor for structural strength in reinforced mortar beds.
Step 7 — Install Mortar Bed
Trowel deck mud or dry pack mortar mix firmly around platforms. Use the platform tops as screeding guides. Leave platforms embedded to maintain slope accuracy and long-term stability.
FAQs
Does Screedex® help installers meet U.S. building codes?
Yes. It supports:
- American National Standards ANSI A108.1A/B/C for thick-bed tile installations
- Tile Council North America (TCNA) slope-to-drain guidelines
How does Screedex® prevent water ponding?
By ensuring consistent, slope-accurate prep, Screedex® eliminates the cause of ponding from improper drainage.
Ideal for:
- Shower pans & bathrooms
- Rooftop terraces
- Balconies & pool decks
- Commercial wet areas
What tools do I need?
Just the basics:
- Adhesive (see below)
- Spirit level, string line, or laser level
- Optional: Drill with hex bit for faster height adjustments
What adhesive should I use?
Use one of the following for a secure bond:
- Moisture-curing polyurethane sealant
- Cement-based tile adhesive
- Moisture-resistant double-sided tape
Do I remove Screedex® after screeding?
No. Screedex® is a permanent part of the floor screed. Removing it compromises the slope and structural reliability.