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ThermRite ProTile 20mm Cementitious XPS Insulation Panel (Accepts Tile Floors Directly)
20mm Total Depth Tile Direct — No Overboard XPS + Cementitious Surface 300 kPa Compressive Strength 16mm Pipe at 150mm Centres 0.72 m² Per Panel New Build & Retrofit 50-Year Guarantee
The ThermRite ProTile20 is a premium 20mm cementitious XPS insulation panel engineered specifically for water underfloor heating installations where tiles are the intended floor finish. Its unique two-layer construction — an extruded polystyrene (XPS) core bonded to a thick glass-fibre reinforced cementitious top layer — eliminates the need for additional tile backer boarding or levelling compound over the heating system. At just 20mm total depth, it is the ideal choice for retrofits, extensions and height-restricted rooms where minimising floor build-up is critical. Pre-routed grooves accommodate 16mm UFH pipe at 150mm centres for high-output, rapid-response performance, and the panel's 300 kPa compressive strength provides a stable, load-bearing substrate under the heaviest tiled finishes.
20 mm
Total Depth
300 kPa
Compressive Strength
150 mm
Pipe Centres
0.72 m²
Per Panel
50 yr
Guarantee
Key Features & Benefits
Tile Direct — No Overboarding Required
The thick cementitious surface layer is compatible with standard flexible tile adhesive, allowing ceramic, porcelain, natural stone and similar tile finishes to be laid directly on top of the panel without any additional tile backer board or levelling compound. This eliminates a full installation step, reduces materials cost and keeps the overall floor build-up to its minimum.
Only 20mm Total Floor Build-Up
Just 20mm from subfloor to top surface — one of the slimmest tile-direct UFH solutions available. This is critical in retrofits where door frames, step heights, existing floor levels and adjacent room thresholds leave little tolerance for floor height increase. Compatible with both concrete screed subfloors and structural timber subfloors (minimum 18mm floor-grade plywood).
XPS Core — Superior Insulation and Moisture Resistance
Extruded polystyrene (XPS) offers significantly better thermal resistance and moisture resistance than expanded polystyrene (EPS) of the same thickness. XPS has a closed-cell structure that resists water absorption, meaning the panel retains its thermal performance even in damp subfloor conditions such as ground-floor concrete slabs or bathroom installations.
300 kPa Compressive Strength — Heavy Load Rated
At 300 kPa (approximately 30 tonnes per m²), the ProTile20 provides a rigid, non-compressible base that fully supports heavy tiled finishes, wet room applications and the sustained foot traffic loads of kitchens, hallways and commercial-grade installations. The cementitious layer additionally distributes point loads across the panel, preventing tile cracking or grout failure over time.
16mm Pipe at 150mm Centres — High Heat Output
Pre-routed grooves at 150mm pipe centres are sized for 16mm multilayer (PEX-Al-PEX or PERT-Al-PERT) underfloor heating pipe. The 150mm spacing delivers a high heat output suitable for both heat-pump and boiler-fed systems, and the cementitious cover layer ensures fast, even heat transfer from pipe to floor surface — reducing warm-up times and improving system responsiveness.
Glass Fibre Reinforced Cementitious Layer — Dimensionally Stable
The surface cementitious layer is reinforced with glass fibre mesh, providing dimensional stability, crack resistance and a high-bond surface for tile adhesive. The same construction is used in professional tile backer boards, ensuring the ProTile20 performs as both an insulation panel and a tile substrate in a single product.
Suitable for New Build and Retrofit
The panel can be bonded using flexible tile adhesive or EPS contact spray adhesive applied with a notched trowel to both solid concrete screed and plywood subfloors, or mechanically fixed using 35mm disc washers with wood screws (timber) or self-tapping TAPCON screws (concrete) — no plugging required. This flexibility makes it equally suitable for new-build slab installations and over-existing-floor retrofit projects.
Standard 1200 × 600mm Panel Format — Easy to Calculate and Cut
Each panel measures 1200 × 600mm (0.72 m²), a standard size that fits neatly into room layouts and minimises offcuts. 14 panels cover 10 m². Panels are easily cut with a circular saw or sharp Stanley knife along the glass fibre and cement facings — no specialist tools required.
Compatible with ThermRite Optional Sub-Insulation
For maximum system efficiency — particularly important when installing over uninsulated ground-floor concrete slabs — ThermRite XPS insulation boards in 3mm, 6mm, 10mm, 20mm and 25mm thicknesses can be pre-bonded to the underside of the ProTile20 panel or laid separately beneath it, significantly reducing downward heat loss without increasing installation complexity.
Technical Specifications
| Panel Dimensions & Coverage | |
| Panel Length | 1200 mm |
| Panel Width | 600 mm |
| Panel Thickness | 20 mm |
| Panel Area | 0.72 m² per panel |
| Coverage | 14 panels = 10.0 m² (approx.) |
| Construction | |
| Core Material | XPS — Extruded Polystyrene (closed-cell) |
| Surface Layer | Thick cementitious layer with glass fibre mesh reinforcement |
| Layer Count | Two layers (XPS core + cementitious top) |
| Performance | |
| Compressive Strength | 300 kPa |
| Pipe Spacing | 150 mm centres |
| Compatible Pipe Diameter | 16 mm |
| Heat Output | High output — suitable for heat pump & boiler systems |
| Floor Finish | Tile direct (ceramic, porcelain, natural stone) |
| Optional Additional Finishes | Carpet, vinyl, wood (with 10mm levelling compound over top) |
| Subfloor Compatibility | |
| Concrete / Screed Subfloor | Yes — bond with flexible tile adhesive or TAPCON self-tapping screws |
| Timber Subfloor | Yes — minimum 18mm structural floor-grade plywood; fix with wood screws and 35mm disc washers |
| Subfloor Flatness Requirement | SR2 minimum (+/− 5mm over a 2m straight edge) |
| Fixing Methods | |
| Adhesive Method | Suitable flexible tile adhesive applied with a notched trowel |
| Mechanical Fix — Timber | 35mm disc washers + wood screws |
| Mechanical Fix — Concrete | 35mm disc washers + TAPCON self-tapping concrete screws (no plugging required) |
| Panel Gap to Walls | Leave 2–3mm expansion gap at all parallel walls |
| Tiling Over the System | |
| Direct Tiling | Yes — prime boards with a tiling primer before laying tile adhesive |
| Recommended Adhesive | Flexible tile adhesive (applied to both board and tile back for large-format tiles) |
| Joint Treatment | Fill any gaps between panels with flexible tile adhesive before tiling |
| Guarantee | |
| Product Guarantee | 50 years |
| SKU | ProTile20-120x60-150-20 |
ℹ Installation Note: Always prime the cementitious surface with a tiling primer before applying tile adhesive. For vinyl, carpet or bonded wood finishes, apply a 10mm levelling compound over the installed panels before laying the floor finish. The subfloor must achieve a minimum SR2 flatness standard before installation.
Frequently Asked Questions
Related Products
16mm Multilayer UFH Pipe (PEX-Al-PEX)
WRAS-approved pipe compatible with ProTile20 grooves
ThermRite Water UFH Manifold
Central distribution for multi-zone ProTile20 installations
$8.50
Original: $24.29
-65%ThermRite ProTile 20mm Cementitious XPS Insulation Panel (Accepts Tile Floors Directly)—
$24.29
$8.50More Images
ThermRite ProTile 20mm Cementitious XPS Insulation Panel (Accepts Tile Floors Directly)
20mm Total Depth Tile Direct — No Overboard XPS + Cementitious Surface 300 kPa Compressive Strength 16mm Pipe at 150mm Centres 0.72 m² Per Panel New Build & Retrofit 50-Year Guarantee
The ThermRite ProTile20 is a premium 20mm cementitious XPS insulation panel engineered specifically for water underfloor heating installations where tiles are the intended floor finish. Its unique two-layer construction — an extruded polystyrene (XPS) core bonded to a thick glass-fibre reinforced cementitious top layer — eliminates the need for additional tile backer boarding or levelling compound over the heating system. At just 20mm total depth, it is the ideal choice for retrofits, extensions and height-restricted rooms where minimising floor build-up is critical. Pre-routed grooves accommodate 16mm UFH pipe at 150mm centres for high-output, rapid-response performance, and the panel's 300 kPa compressive strength provides a stable, load-bearing substrate under the heaviest tiled finishes.
20 mm
Total Depth
300 kPa
Compressive Strength
150 mm
Pipe Centres
0.72 m²
Per Panel
50 yr
Guarantee
Key Features & Benefits
Tile Direct — No Overboarding Required
The thick cementitious surface layer is compatible with standard flexible tile adhesive, allowing ceramic, porcelain, natural stone and similar tile finishes to be laid directly on top of the panel without any additional tile backer board or levelling compound. This eliminates a full installation step, reduces materials cost and keeps the overall floor build-up to its minimum.
Only 20mm Total Floor Build-Up
Just 20mm from subfloor to top surface — one of the slimmest tile-direct UFH solutions available. This is critical in retrofits where door frames, step heights, existing floor levels and adjacent room thresholds leave little tolerance for floor height increase. Compatible with both concrete screed subfloors and structural timber subfloors (minimum 18mm floor-grade plywood).
XPS Core — Superior Insulation and Moisture Resistance
Extruded polystyrene (XPS) offers significantly better thermal resistance and moisture resistance than expanded polystyrene (EPS) of the same thickness. XPS has a closed-cell structure that resists water absorption, meaning the panel retains its thermal performance even in damp subfloor conditions such as ground-floor concrete slabs or bathroom installations.
300 kPa Compressive Strength — Heavy Load Rated
At 300 kPa (approximately 30 tonnes per m²), the ProTile20 provides a rigid, non-compressible base that fully supports heavy tiled finishes, wet room applications and the sustained foot traffic loads of kitchens, hallways and commercial-grade installations. The cementitious layer additionally distributes point loads across the panel, preventing tile cracking or grout failure over time.
16mm Pipe at 150mm Centres — High Heat Output
Pre-routed grooves at 150mm pipe centres are sized for 16mm multilayer (PEX-Al-PEX or PERT-Al-PERT) underfloor heating pipe. The 150mm spacing delivers a high heat output suitable for both heat-pump and boiler-fed systems, and the cementitious cover layer ensures fast, even heat transfer from pipe to floor surface — reducing warm-up times and improving system responsiveness.
Glass Fibre Reinforced Cementitious Layer — Dimensionally Stable
The surface cementitious layer is reinforced with glass fibre mesh, providing dimensional stability, crack resistance and a high-bond surface for tile adhesive. The same construction is used in professional tile backer boards, ensuring the ProTile20 performs as both an insulation panel and a tile substrate in a single product.
Suitable for New Build and Retrofit
The panel can be bonded using flexible tile adhesive or EPS contact spray adhesive applied with a notched trowel to both solid concrete screed and plywood subfloors, or mechanically fixed using 35mm disc washers with wood screws (timber) or self-tapping TAPCON screws (concrete) — no plugging required. This flexibility makes it equally suitable for new-build slab installations and over-existing-floor retrofit projects.
Standard 1200 × 600mm Panel Format — Easy to Calculate and Cut
Each panel measures 1200 × 600mm (0.72 m²), a standard size that fits neatly into room layouts and minimises offcuts. 14 panels cover 10 m². Panels are easily cut with a circular saw or sharp Stanley knife along the glass fibre and cement facings — no specialist tools required.
Compatible with ThermRite Optional Sub-Insulation
For maximum system efficiency — particularly important when installing over uninsulated ground-floor concrete slabs — ThermRite XPS insulation boards in 3mm, 6mm, 10mm, 20mm and 25mm thicknesses can be pre-bonded to the underside of the ProTile20 panel or laid separately beneath it, significantly reducing downward heat loss without increasing installation complexity.
Technical Specifications
| Panel Dimensions & Coverage | |
| Panel Length | 1200 mm |
| Panel Width | 600 mm |
| Panel Thickness | 20 mm |
| Panel Area | 0.72 m² per panel |
| Coverage | 14 panels = 10.0 m² (approx.) |
| Construction | |
| Core Material | XPS — Extruded Polystyrene (closed-cell) |
| Surface Layer | Thick cementitious layer with glass fibre mesh reinforcement |
| Layer Count | Two layers (XPS core + cementitious top) |
| Performance | |
| Compressive Strength | 300 kPa |
| Pipe Spacing | 150 mm centres |
| Compatible Pipe Diameter | 16 mm |
| Heat Output | High output — suitable for heat pump & boiler systems |
| Floor Finish | Tile direct (ceramic, porcelain, natural stone) |
| Optional Additional Finishes | Carpet, vinyl, wood (with 10mm levelling compound over top) |
| Subfloor Compatibility | |
| Concrete / Screed Subfloor | Yes — bond with flexible tile adhesive or TAPCON self-tapping screws |
| Timber Subfloor | Yes — minimum 18mm structural floor-grade plywood; fix with wood screws and 35mm disc washers |
| Subfloor Flatness Requirement | SR2 minimum (+/− 5mm over a 2m straight edge) |
| Fixing Methods | |
| Adhesive Method | Suitable flexible tile adhesive applied with a notched trowel |
| Mechanical Fix — Timber | 35mm disc washers + wood screws |
| Mechanical Fix — Concrete | 35mm disc washers + TAPCON self-tapping concrete screws (no plugging required) |
| Panel Gap to Walls | Leave 2–3mm expansion gap at all parallel walls |
| Tiling Over the System | |
| Direct Tiling | Yes — prime boards with a tiling primer before laying tile adhesive |
| Recommended Adhesive | Flexible tile adhesive (applied to both board and tile back for large-format tiles) |
| Joint Treatment | Fill any gaps between panels with flexible tile adhesive before tiling |
| Guarantee | |
| Product Guarantee | 50 years |
| SKU | ProTile20-120x60-150-20 |
ℹ Installation Note: Always prime the cementitious surface with a tiling primer before applying tile adhesive. For vinyl, carpet or bonded wood finishes, apply a 10mm levelling compound over the installed panels before laying the floor finish. The subfloor must achieve a minimum SR2 flatness standard before installation.
Frequently Asked Questions
Related Products
16mm Multilayer UFH Pipe (PEX-Al-PEX)
WRAS-approved pipe compatible with ProTile20 grooves
ThermRite Water UFH Manifold
Central distribution for multi-zone ProTile20 installations
Product Information
Product Information
Shipping & Returns
Shipping & Returns
Description
20mm Total Depth Tile Direct — No Overboard XPS + Cementitious Surface 300 kPa Compressive Strength 16mm Pipe at 150mm Centres 0.72 m² Per Panel New Build & Retrofit 50-Year Guarantee
The ThermRite ProTile20 is a premium 20mm cementitious XPS insulation panel engineered specifically for water underfloor heating installations where tiles are the intended floor finish. Its unique two-layer construction — an extruded polystyrene (XPS) core bonded to a thick glass-fibre reinforced cementitious top layer — eliminates the need for additional tile backer boarding or levelling compound over the heating system. At just 20mm total depth, it is the ideal choice for retrofits, extensions and height-restricted rooms where minimising floor build-up is critical. Pre-routed grooves accommodate 16mm UFH pipe at 150mm centres for high-output, rapid-response performance, and the panel's 300 kPa compressive strength provides a stable, load-bearing substrate under the heaviest tiled finishes.
20 mm
Total Depth
300 kPa
Compressive Strength
150 mm
Pipe Centres
0.72 m²
Per Panel
50 yr
Guarantee
Key Features & Benefits
Tile Direct — No Overboarding Required
The thick cementitious surface layer is compatible with standard flexible tile adhesive, allowing ceramic, porcelain, natural stone and similar tile finishes to be laid directly on top of the panel without any additional tile backer board or levelling compound. This eliminates a full installation step, reduces materials cost and keeps the overall floor build-up to its minimum.
Only 20mm Total Floor Build-Up
Just 20mm from subfloor to top surface — one of the slimmest tile-direct UFH solutions available. This is critical in retrofits where door frames, step heights, existing floor levels and adjacent room thresholds leave little tolerance for floor height increase. Compatible with both concrete screed subfloors and structural timber subfloors (minimum 18mm floor-grade plywood).
XPS Core — Superior Insulation and Moisture Resistance
Extruded polystyrene (XPS) offers significantly better thermal resistance and moisture resistance than expanded polystyrene (EPS) of the same thickness. XPS has a closed-cell structure that resists water absorption, meaning the panel retains its thermal performance even in damp subfloor conditions such as ground-floor concrete slabs or bathroom installations.
300 kPa Compressive Strength — Heavy Load Rated
At 300 kPa (approximately 30 tonnes per m²), the ProTile20 provides a rigid, non-compressible base that fully supports heavy tiled finishes, wet room applications and the sustained foot traffic loads of kitchens, hallways and commercial-grade installations. The cementitious layer additionally distributes point loads across the panel, preventing tile cracking or grout failure over time.
16mm Pipe at 150mm Centres — High Heat Output
Pre-routed grooves at 150mm pipe centres are sized for 16mm multilayer (PEX-Al-PEX or PERT-Al-PERT) underfloor heating pipe. The 150mm spacing delivers a high heat output suitable for both heat-pump and boiler-fed systems, and the cementitious cover layer ensures fast, even heat transfer from pipe to floor surface — reducing warm-up times and improving system responsiveness.
Glass Fibre Reinforced Cementitious Layer — Dimensionally Stable
The surface cementitious layer is reinforced with glass fibre mesh, providing dimensional stability, crack resistance and a high-bond surface for tile adhesive. The same construction is used in professional tile backer boards, ensuring the ProTile20 performs as both an insulation panel and a tile substrate in a single product.
Suitable for New Build and Retrofit
The panel can be bonded using flexible tile adhesive or EPS contact spray adhesive applied with a notched trowel to both solid concrete screed and plywood subfloors, or mechanically fixed using 35mm disc washers with wood screws (timber) or self-tapping TAPCON screws (concrete) — no plugging required. This flexibility makes it equally suitable for new-build slab installations and over-existing-floor retrofit projects.
Standard 1200 × 600mm Panel Format — Easy to Calculate and Cut
Each panel measures 1200 × 600mm (0.72 m²), a standard size that fits neatly into room layouts and minimises offcuts. 14 panels cover 10 m². Panels are easily cut with a circular saw or sharp Stanley knife along the glass fibre and cement facings — no specialist tools required.
Compatible with ThermRite Optional Sub-Insulation
For maximum system efficiency — particularly important when installing over uninsulated ground-floor concrete slabs — ThermRite XPS insulation boards in 3mm, 6mm, 10mm, 20mm and 25mm thicknesses can be pre-bonded to the underside of the ProTile20 panel or laid separately beneath it, significantly reducing downward heat loss without increasing installation complexity.
Technical Specifications
| Panel Dimensions & Coverage | |
| Panel Length | 1200 mm |
| Panel Width | 600 mm |
| Panel Thickness | 20 mm |
| Panel Area | 0.72 m² per panel |
| Coverage | 14 panels = 10.0 m² (approx.) |
| Construction | |
| Core Material | XPS — Extruded Polystyrene (closed-cell) |
| Surface Layer | Thick cementitious layer with glass fibre mesh reinforcement |
| Layer Count | Two layers (XPS core + cementitious top) |
| Performance | |
| Compressive Strength | 300 kPa |
| Pipe Spacing | 150 mm centres |
| Compatible Pipe Diameter | 16 mm |
| Heat Output | High output — suitable for heat pump & boiler systems |
| Floor Finish | Tile direct (ceramic, porcelain, natural stone) |
| Optional Additional Finishes | Carpet, vinyl, wood (with 10mm levelling compound over top) |
| Subfloor Compatibility | |
| Concrete / Screed Subfloor | Yes — bond with flexible tile adhesive or TAPCON self-tapping screws |
| Timber Subfloor | Yes — minimum 18mm structural floor-grade plywood; fix with wood screws and 35mm disc washers |
| Subfloor Flatness Requirement | SR2 minimum (+/− 5mm over a 2m straight edge) |
| Fixing Methods | |
| Adhesive Method | Suitable flexible tile adhesive applied with a notched trowel |
| Mechanical Fix — Timber | 35mm disc washers + wood screws |
| Mechanical Fix — Concrete | 35mm disc washers + TAPCON self-tapping concrete screws (no plugging required) |
| Panel Gap to Walls | Leave 2–3mm expansion gap at all parallel walls |
| Tiling Over the System | |
| Direct Tiling | Yes — prime boards with a tiling primer before laying tile adhesive |
| Recommended Adhesive | Flexible tile adhesive (applied to both board and tile back for large-format tiles) |
| Joint Treatment | Fill any gaps between panels with flexible tile adhesive before tiling |
| Guarantee | |
| Product Guarantee | 50 years |
| SKU | ProTile20-120x60-150-20 |
ℹ Installation Note: Always prime the cementitious surface with a tiling primer before applying tile adhesive. For vinyl, carpet or bonded wood finishes, apply a 10mm levelling compound over the installed panels before laying the floor finish. The subfloor must achieve a minimum SR2 flatness standard before installation.
Frequently Asked Questions
Related Products
16mm Multilayer UFH Pipe (PEX-Al-PEX)
WRAS-approved pipe compatible with ProTile20 grooves
ThermRite Water UFH Manifold
Central distribution for multi-zone ProTile20 installations
