Overview
The Wedge calcium silicate XPS sandwich panel (CSC XPS 250) is a five-layer, factory-bonded composite: a calcium silicate cement mortar is applied over an alkali-resistant fibreglass mesh on both faces of a Wedge CCXP extruded polystyrene core and cured under controlled conditions. The facing cannot delaminate in service and the panel is equally rigid in both directions.
One panel replaces the three-trade build-up of insulation board, waterproofing membrane and cement backer board. The core delivers stable low thermal conductivity and near-zero water absorption; the calcium silicate cement facing delivers surface rigidity, fire retardance, weather protection and a rough key that bonds directly to cementitious tile adhesives, screeds and renders.
CSC XPS 250 is the grade to specify wherever the board is exposed to weather, fire risk, heavy loads or long-term humidity — roof decks, inverted terrace roofs, façades, LGSF and modular wall panels, cold-store floors and walls, pools and spas — as well as for premium interior tiling. For fully tiled interior walls the economical MXPS polymer-mortar grade is available on the same core.
Download the CSC XPS Boards catalogue (PDF)
Full 2026 technical catalogue — five-layer construction, declared values, CCXP core grade selector, floor, roof and wall build-ups, sizes, packing, installation guide and export data. 13 pages, 7 MB.
Calcium Silicate XPS Sandwich Panel specifications
Declared values for the finished calcium silicate cement coated board. Values are typical for the standard 20 mm and 30 mm boards on a CCXP 45 core; other cores and thicknesses on request. Values are determined by the test methods listed and are not a specification — request a Material Test Certificate for the batch supplied where a value must be guaranteed.
| Property | Value | Test standard / note |
|---|---|---|
| Thermal conductivity, λ | 0.030 W/m·K | EN 12667:2001 |
| Composite panel density | 200 to 300 kg/m³ | DIN 53420 |
| Compressive strength at 10 % deflection | Minimum 0.3 N/mm² (300 kPa); core grades 200–700 kPa | EN 826:1996 / ASTM D1621 |
| Bond strength, tile adhesive to facing | 0.3 N/mm² | BS EN 1348 |
| Maximum tile loading weight | 62 kg/m² | CERAM 121107 |
| Flexural strength | 2.05 ± 0.02 MPa | ASTM C203 |
| Water vapour permeability, Sd | 3.2 m | DIN EN 12086 |
| Resistance to body impact | 3 × 120 N/m | ETAG 003 |
| Bending stiffness, E (20 mm / 30 mm) | 601 kN·mm² / 1285 kN·mm² | EN 12089 |
| Coefficient of linear expansion | 30 × 10⁻⁶ K⁻¹ | — |
| Reaction to fire (flammability) | Class E | EN 13501-1 |
| Impact sound reduction, ΔLw | 21 dB | BS ISO 140-8 |
| Shear bond strength | 3.32 kg/cm² | EN 1448 |
| Water absorption, long-term immersion (core) | ≤ 0.7 % by volume | ASTM C578 / EN 12087 |
| Surface strength of coating | ≥ 1 MPa | — |
| Service temperature | −30 °C to +80 °C | — |
| Thermal resistance RD, core | 0.29 m²·K/W at 10 mm; 1.47 at 50 mm; 2.94 at 100 mm | ASTM C177 / C518 |
| Thickness available | 6 to 100 mm (thicker as two bonded layers) | ±1.0 mm (≤30 mm); ±1.5 mm (>30 mm) |
| Length × width | 1200–3000 × 600–1200 mm | ±3 mm |
| Nominal weight | 5.0 kg/m² at 20 mm; 7.5 at 30 mm; 12.5 at 50 mm; 25.0 at 100 mm | — |
| Blowing agent | CFC and HCFC free | — |
XPS core grade selector
The core grade sets the compressive strength of the finished board; choose it from the load the floor, roof or wall will carry.
| Property | Value | Test standard / note |
|---|---|---|
| CCXP 30 — 30 kg/m³, 200 kPa | Wall tile backer, partitions | ASTM D1622 / D1621 |
| CCXP 35 — 35 kg/m³, 300 kPa | Wall and floor tile backer | ASTM D1622 / D1621 |
| CCXP 36 — 37 kg/m³, 350 kPa | Floor tile backer, underfloor heating | ASTM D1622 / D1621 |
| CCXP 45 — 40 kg/m³, 450 kPa | Roof, floor under screed, prefab panels | ASTM D1622 / D1621 |
| CCXP 60 — 45 kg/m³, 600 kPa | Inverted roof, cold-store floor | ASTM D1622 / D1621 |
| CCXP 70 — 48 kg/m³, 700 kPa | Heavy-load floor, trafficked roof | ASTM D1622 / D1621 |
Calcium Silicate XPS Sandwich Panel price
Calcium silicate XPS sandwich panels are priced per m² by thickness, core grade and board format. As the premium fire-retardant grade, CSC XPS 250 costs more per m² than MXPS but replaces the insulation board, waterproofing membrane and cement backer board it displaces, and installs in one operation. Pricing is on application — send the drawing or the floor, roof or wall areas, the thermal target and the load case for a firm quotation in ₹ INR and $ USD.
Minimum order is one pallet within India and one 20′ GP container for export: indicatively 1,300 m² at 20 mm, 860 m² at 30 mm, 520 m² at 50 mm or 260 m² at 100 mm per 20′ GP (double in a 40′ HQ). EXW, FOB, CIF and DAP terms offered.
Applications
- Roofs — under screed, tiles or paving on flat RCC roofs; inverted (protected-membrane) terrace roofs; under metal decks in pre-engineered buildings; roof gardens and green roofs (30–100 mm, CCXP 45–70).
- Floors — tile backer and underfloor-heating board (10–30 mm, CCXP 36–45); floors under screed; cold-store floors under the wearing slab (50–100 mm, CCXP 60–70).
- External walls — cavity-wall and façade insulation under render or adhesive-fixed cladding (25–50 mm, CCXP 35–45).
- Prefab, LGSF and modular panels — insulation, rigid sheathing and render or tile face in one board, fixed to cold-formed steel studs (30–50 mm).
- Cold stores — floors and walls of chilled and frozen rooms; Sd 3.2 m and ≤0.7 % water absorption keep the insulation dry (50–100 mm, CCXP 60–70).
- Wet areas, pools and spas — waterproof tile substrate unaffected by continuous humidity and chlorinated atmospheres (10–20 mm).
Typical build-up — tiled wet-room floor with underfloor heating
| Property | Value | Test standard / note |
|---|---|---|
| 1. Ceramic or porcelain tile + epoxy or polymer grout | Tile and adhesive load ≤ 62 kg/m² | — |
| 2. Flexible C2 S1 cement adhesive, 6–8 mm notched bed | Encapsulates heating cable or mat | EN 12004 |
| 3. Wedge CSC XPS 250, 10–30 mm, joints taped | Insulation, waterproofing and tile substrate in one | — |
| 4. Flexible C2 cement adhesive, full bed | No mechanical fixing needed on concrete | — |
| 5. Concrete slab or sand-cement screed | Flat to 3 mm in 2 m; primed if porous | — |
Installation
- Floors and walls — prepare a sound, dry substrate flat to 3 mm in 2 m; score and snap the board; bed in flexible C2 cement adhesive with a 6–8 mm notched trowel; on studs fix with corrosion-resistant screws and 35 mm washers at 300 mm centres; tape every joint with 100 mm alkali-resistant mesh; tile directly onto the cement face.
- Roofs — lay boards tightly butted in a staggered bond on the membrane (inverted roof) or slab (conventional roof); cover an inverted roof with a geotextile separation layer and a minimum 50 mm screed, paving on pedestals or 50 mm washed gravel sized for wind uplift and flotation; on metal decks fix with approved fasteners and 50 mm stress plates, five per board.
- External walls and prefab panels — fix to masonry with adhesive plus five anchors per m², or to LGSF and timber studs with screws and washers at 300 mm centres; apply a polymer-modified base-coat render with embedded alkali-resistant mesh over the full face and joints before the finish render or cladding adhesive; provide movement joints at not more than 6 m centres.
- Do not leave boards exposed to sunlight for more than seven days before covering; do not use solvent-based adhesives or primers on the core; do not expose the board to temperatures above 80 °C.
- The full Wedge Application Guide for CSC XPS, with drawings and detailing at upstands, drains and movement joints, is available on request.
Sizes, thickness and packing
Standard formats: 1200 × 600 mm (tile backer small), 2440 × 1220 mm (tile backer large / insulation board), 2500 × 600 mm (insulation board) and project cut-to-size up to 3000 × 1200 mm. Thicknesses 6, 10, 12, 20, 25, 30, 50, 75 and 100 mm from stock; intermediate thicknesses to order. Square edge standard; shiplap and tongue-and-groove on core boards on request.
Product code: CSC-45-20-2440 = calcium silicate cement facing, CCXP 45 core, 20 mm, 2440 mm length. Boards are stacked flat, face to face, on fumigated (ISPM 15) wooden pallets to 1.2 m height with corner protectors and stretch film; each pallet is labelled with product code, batch number, quantity and manufacturing date and an MTC is issued per batch on request.
Why buy from Wedge Industries Limited
- Manufactured in Faridabad, India, with group sourcing from the United Kingdom, Spain and China; exported to 45+ countries across the Gulf, Europe, South and South East Asia, Africa and North America.
- Every figure published here is a tested value to the standard stated, not an estimate. A Material Test Certificate (MTC) is issued per batch on request, and a TDS, MSDS and Application Guide are available for every grade.
- Standard formats ship from stock; project quantities and cut-to-size boards are produced to order with a typical lead time of three to four weeks ex-works.
- Minimum order: one pallet for domestic supply; one 20′ GP container for export (indicatively 1,300 m² at 20 mm or 520 m² at 50 mm). Mixed-thickness containers accepted.
- Incoterms offered: EXW, FOB, CIF and DAP. HS code 3921.11 (indicative). Export documentation and compliance support through group company ZJELL Limited.
- Ancillaries supplied with the boards: 100 mm alkali-resistant joint tape, corrosion-resistant screws and 35 mm washers, masonry anchors, flexible C2 S1 tile adhesive, polymer-modified base-coat render and sealant.
Frequently asked questions
What is a calcium silicate XPS sandwich panel?
It is a rigid insulation panel with a closed-cell extruded polystyrene core and a calcium silicate cement facing bonded over fibreglass mesh on both sides. Wedge supplies it as CSC XPS 250. One panel provides thermal insulation, waterproofing and a fire-retardant, tile- or render-ready surface.
What is the fire rating of CSC XPS 250?
The composite board is classified Class E to EN 13501-1, and the calcium silicate cement facing protects the XPS core. Additional fire-retardant additives can be supplied on request. The fire resistance of a complete floor, roof or wall assembly depends on the whole build-up and must be assessed against the applicable building code.
Which core grade should I specify?
Choose the core from the load case: CCXP 30 to 35 (200 to 300 kPa) for wall tile backer, CCXP 36 to 45 (350 to 450 kPa) for floors, underfloor heating and prefab panels, and CCXP 60 to 70 (600 to 700 kPa) for inverted roofs, cold-store floors and trafficked roofs. Wedge confirms the grade against the project load schedule on request.
What R-value does the board give?
Declared thermal resistance of the core is 0.29 m²·K/W at 10 mm, 0.88 at 25 mm, 1.47 at 50 mm, 2.06 at 75 mm and 2.94 at 100 mm to ASTM C177 and C518. Wedge provides U-value calculations for the complete build-up, including compliance checks against the applicable energy code.
Can it be used in cold storage and on roofs?
Yes. Water vapour permeability Sd of 3.2 m and water absorption of 0.7 % or less by volume keep the insulation dry on cold-store floors and walls and in inverted roofs, where the board sits above the waterproofing membrane and retains its full insulating value. Use CCXP 60 or 70 for floors and trafficked roofs.
What is the minimum order, lead time and HS code?
One pallet for domestic supply and one 20-foot container for export, with mixed thicknesses accepted. Standard formats ship from stock; project quantities and cut-to-size boards take three to four weeks ex-works. The indicative HS code for coated XPS boards is 3921.11.
Need the full data sheet set? Download the CSC XPS Boards catalogue (PDF) or request the TDS, MSDS and Application Guide with your enquiry.
Related products
- Tile Backer Board — waterproof XPS
- Polymer Cement Coated XPS Board (MXPS)
- Cement XPS Sandwich Panel — floors, walls and prefab
- XPS Roof Insulation Board — cement coated
- Calcium Silicate Boards (high-temperature)
- Insulation thickness calculator
Request a quotation for Calcium Silicate XPS Sandwich Panel
Send the floor, roof or wall area, required thickness or U-value, load case and delivery location. Wedge Industries Limited returns a grade and thickness recommendation, a board and ancillary schedule and a firm price in INR and USD.
