TI ProBoard Installation Guide
Save time and money with TI ProBoard – Made in the USA.
Step-by-Step TI ProBoard Installation Instructions
TI ProBoard is a structural composite underlayment system designed for exterior tile decks, balconies, rooftop terraces, patios, and elevated outdoor living spaces.
The system installs directly over joists without requiring traditional plywood decking or cement backer board, helping simplify installation while creating a durable tile-ready surface.
Step 1: Place TI ProBoard panels directly on the joists.
Step 2: Start with the first board (with slot) at the edge. Make sure it is straight and square.
Step 3: Use a chalk line to keep alignment accurate.
Step 4: Interlock each board and fasten to every joist.
Existing Decks
Existing exterior decks may be tiled over provided the structure is stable, properly supported, and suitable for tile installation. Always inspect the framing, surface condition, and drainage slope before beginning installation.
Proper slope is critical for water runoff and long-term exterior tile performance.
Fastening Methods
Plywood / Backer Board Applications: Use screws, nails, or staples to properly secure the TI-ProBoard system to the substrate.
Concrete or Thin Slab Applications: Spray adhesive such as 3M Type 90 may be used. Masonry screws can also be installed temporarily to help stabilize panels while adhesives cure.
Joining Boards
All board joints should be centered over joists for proper support and structural performance.
Important: Avoid running continuous seams along the same joist line. All seams should be staggered to help improve overall system strength and long-term stability.
Each TI-ProBoard panel should span a minimum of three joist spaces.
Mortar Application
Mix mortar according to manufacturer instructions and trowel evenly across the surface while fully filling the rib channels.
Proper mortar coverage helps create a strong and stable tile-ready surface for exterior installations.
Recommended Materials: Mer-Krete Underlayment C or equivalent exterior-rated underlayment systems.
Cutting Tip: A wet saw is recommended for cleaner and more accurate cuts when trimming TI-ProBoard panels.
Edging Installation
Install TI edging while the thinset mortar remains wet. Press edging firmly against the deck perimeter to create a clean finished appearance while helping protect exposed tile edges.
Note: Panels are also available in black.
Installation Tips
- Screw placement should occur every 4 ribs
- Recommended joist spacing is 16" on center
- Use one coated deck screw per joist per panel
- Maintain a minimum slope of 1/4" per foot away from structures
- Install only within temperatures between 40°F and 95°F
- Use exterior-rated porcelain tile for outdoor applications
- Thinset coverage should be at least 98%
- Back buttering tile is strongly recommended
- Use thinset meeting ANSI A118.4 or higher standards
System Components
- Mortar bed: Mer-Krete Underlayment C or equivalent
- Thinset mortar: Modified ANSI A118.4+
- Fasteners: 1-1/4" coated deck screws
- Grout: Exterior-rated grout systems
Optional Waterproofing
After the underlayment has cured, a waterproofing membrane such as Hydro-Guard 2000 may be installed before tile installation begins.
Waterproofing systems are especially important for installations located above occupied living spaces.
Material Composition
TI-ProBoard is manufactured using advanced composite ribs bonded to fiberglass matting to create a lightweight yet structurally durable installation surface.
Performance and Testing
Deflection Test: ASTM C627 rated “Extra Heavy.”
Freeze/Thaw Resistance: No visible damage observed during testing.
Temperature Testing: Tested from -30°F to 130°F without deformation or structural damage.
Benefits of TI-ProBoard
- No plywood or additional backer board required
- Creates a dry area below elevated deck systems
- Designed for low-maintenance exterior tile installations
- Suitable for residential and commercial applications
- Direct-to-joist installation system simplifies construction
- Low-profile design helps reduce overall floor height
Warranty Information
TI-ProBoard includes a 10-year limited warranty against rotting, cracking, and structural failure not related to improper installation.
Additional claims are covered for a period of 2 years according to manufacturer warranty guidelines.
Final Notes
When installed using proper preparation methods, approved setting materials, and correct drainage design, TI-ProBoard provides a durable and long-lasting tiled deck system suitable for demanding exterior environments.
Installation and Helpful Resources
- Step-by-Step ClearPath Shower Installation Guide
- ClearPath Curbless Shower Installation Manual
- TI-ProBoard Installation Instruction Guide
- TI-ProBoard Installation Video
Shop Related Products and Collections