Bendable Tile Backer Boards for Curves and Shapes
Precision-cut XPS foam board with cementitious coating — bends to a tight radius for curved walls, columns, arches and custom shapes while maintaining waterproofing and tile adhesion.
Insutile Flexboard is a waterproof, thermally insulating tile backer board engineered for curves. Precision-cut slots run along one face of its high-density XPS core, letting the rigid 20mm board bend smoothly around archways, cylindrical columns, curved partition walls, bath panels, shower seats, and tailored architectural features — achieving radii as tight as 200mm, well beyond what standard flat boards allow.
Once shaped and fixed against a frame or wall, the slots are filled with tile adhesive to lock the curve in place and restore full structural rigidity. The result is a solid, waterproof, pre-primed cementitious surface ready for direct tiling, mosaic work, or plaster — with the thermal and acoustic benefits of the XPS core built in.
Standard boards are 20mm thick with a 200mm minimum bend radius. Custom thicknesses and tighter radii are available to order for specialist projects.
Ready for tiling straight out of the box, Insutile Flexboard is cost-efficient, easy to install, and the fastest way to turn complex curved designs into finished surfaces.
Precision-cut slots on one surface enable smooth bending to tight radii without cracking or damage.
Fill slots with adhesive to restore full structural rigidity and create a permanent curved substrate.
Insutile® Flex Board delivers superior performance for curved applications:
Pre-slotted design allows smooth bending to tight radii without cracking or structural compromise.
Pre-cut slots bend smoothly to tight radii — columns, arches, and curved bath panels with no fracture.
XPS core is inherently waterproof and maintains moisture resistance even when bent and filled.
Closed-cell XPS core resists moisture even when bent and adhesive-filled — true wet-area durability.
Cementitious surface bonds reliably with all standard tile adhesives on curved surfaces.
Cementitious face bonds to all tile adhesives on curves — no movement, no bond failure.
No need for on-site slotting — simply bend along the precision-cut slots and fill with adhesive.
Factory slots eliminate on-site cutting — bend, fill with adhesive, done.
Fill slots with adhesive to restore full structural rigidity for a permanent, solid curved substrate.
Once adhesive fills the slots the board cures rigid — solid load-bearing curves.
Bends either way — slits inside the curve, or smooth face inside — for total layout flexibility.
Bends either way — slits inside for tightest radius, or smooth face inside when layout demands.
Flexible yet durable — can be bent by hand without special equipment or tools.
Bends by hand — no specialist bending machinery, no equipment rental.
Compatible with ceramic, porcelain, and natural stone tiles of all sizes and styles.
Supports ceramic, porcelain, and natural stone on curves — no material restrictions.
Perfect for creating curved walls, columns, arches, niches, and custom architectural shapes.
Perfect for curved walls, columns, arches, and niches — bring design vision to life.
Insutile® Flex Board — available dimensions and key performance specs:
| Thickness | Width | Length |
|---|---|---|
| 20 | 600 | 1200 |
| 20 | 600 | 2400 |
Flex Board bends to a minimum radius of 200 mm using its factory-cut slots — ideal for columns, arches, curved partitions, and organic architectural shapes. No heat forming, no site-mixed forms, no timber bracing required to hold the curve.
Bends either way. Preferred: slits inside the curve for the tightest radius — fill slits with adhesive and embed fiberglass mesh across the curve. Alternative: smooth face inside when the layout demands it.
Ideal for a wide range of applications in residential, commercial, and specialty settings.
Seven essential steps for a successful Insutile® Flex Board install. Click a step to view its plate.
Measure the curved surface and cut Flex Board to length using a fine-tooth saw or utility knife — no power tools needed.
Cut to length with a fine-tooth saw.
Confirm curve falls within min-bend spec.
Test the curve before any adhesive.
Tile adhesive into slots + substrate.
Bend into place; press firmly.
Pack slots with adhesive; add mesh if slits are inside.
Let cure, then tile directly.
Flex Board can be bent either way. Preferred: bend with the slits on the inside of the curve for the tightest radius, fill the slits with cement-based adhesive, and embed fiberglass mesh across the curve for extra support.
The steps shown are a recommended installation guide. Site conditions, substrates, and finishes vary — always consult a qualified contractor or specifier to confirm the correct method for your project.
Insutile® Flex Board outperforms alternatives for curved applications:
| Property | Insutile® Flex Board | Scored Standard Board | Flexible Plasterboard | Render on Mesh |
|---|---|---|---|---|
| Minimum Bend Radius | Very Tight (150mm+) | Very Limited | Moderate | Limited |
| Tile-Ready Surface | ✓ | ✗ | ✗ | ✗ |
| Waterproof Core | ✓ | ✗ | ✗ | ✗ |
| Structural After Bending | ✓ | ✗ | ✗ | Partial |
| Installation Speed | Fast | ✗ | Moderate | Slow |
| Curve Quality Consistency | Excellent | Poor | Good | Variable |
| Weight | Lightweight | Heavy | Light | Heavy |
Insutile offers a complete line of specialty construction insulation products:
High-performance tile backer board for wet and dry environments.
Pre-formed angles for efficient corner and edge protection.
Specialized underlayment for shower bases and wet environments.
Tapes, meshes, sealants, and fastening systems for complete installations.
Our technical team is ready to help you choose the right thickness, discuss bend radii, and ensure perfect installation on your curved surfaces and architectural features.
Flex Board turns curved interior walls and room dividers from a costly custom job into a standard tile-ready build. Score-cut sections wrap smoothly around radii as tight as 200 mm while giving you a fully waterproof substrate ready for direct bonding of tile, stone, or render.
20 mm and 30 mm Flex Board are ideal for curved wall applications. Thicker sections provide added rigidity on tall partitions while preserving the bend characteristic. Finish with tile, stone veneer, render, or microcement directly to the board face.
Flex Board turns curved shower builds into a clean, waterproof, tile-ready workflow. Score-cut sections wrap the shower radius while the closed-cell XPS core keeps water out for the life of the build.
20 mm for standard curved shower walls. 30 mm where additional rigidity is needed on taller walls or when tiling with heavy natural stone.
Wrap round structural columns with a tile-ready waterproof shell. Flex Board bends a full 360° around round pillars without shims, packers, or site-built formers — giving you a seamless curved substrate in a fraction of the time.
20 mm is standard for column wraps. Use 30 mm when a thicker decorative rebate is required for niche lighting, integrated trim, or heavy natural-stone finishes.
Build waterproof, tile-ready arches and alcoves that would otherwise need custom joinery. Flex Board bends around any arch or niche radius from 200 mm upward, giving you a clean curved substrate ready for tile, stone, or render.
20 mm for standard niches and archways. Thinner options available on request for purely decorative niches where load is not a concern.
Flex Board is purpose-built for the curves, humidity, and tile work that define spa, sauna, and wellness interiors. The XPS core stays stable under repeated wet/dry cycles while the cement-coated faces tile like traditional backer board.
30 mm for seating and load-bearing spa elements; 20 mm for non-structural wet walls and vertical features.
Build curved reception desks, hospitality counters, and feature bars with a tile-ready, waterproof, insulating core — no joinery shop required. Score-cut Flex Board sections form clean curved fronts and radius ends on-site.
30 mm for structural counter bodies with stone or solid-surface tops; 20 mm for front cladding over an existing timber or metal frame.
