25mm Polycarbonate Sheet 7X Wall - Opal 4000mm x 1050mm

Why Choose 25mm Opal 7X Wall Polycarbonate Roofing Sheets?

Our 25mm opal 7X wall polycarbonate sheets combine the best thermal insulation in our standard multiwall range with a milky opal finish that scatters incoming light evenly, eliminating glare and harsh direct sun. The seven-layer internal structure delivers a U-value of 1.60 W/m²K — far better than 16mm triplewall (2.40 W/m²K) or 10mm twinwall (3.20 W/m²K) — while the opal tint brings light transmission down to 30%, ideal where privacy, comfort and solar control matter as much as insulation. Maximum rafter spacing is 1250mm, and impact resistance is 200 times that of glass.

Applications

Conservatories and Sunrooms: The premium choice for south-facing or sun-exposed conservatories where both thermal performance and glare control are priorities. The opal finish softens and diffuses incoming light while the 1.60 W/m²K U-value minimises heat loss in winter — making the space comfortable in all seasons.

Large Canopy Roofs and Carports: Creates a consistently shaded, comfortable environment underneath with no harsh patches of direct sun. The 1250mm maximum rafter spacing allows broad, open frame designs, and the opal appearance gives a clean, finished look.

Garden Rooms and Studios: Where a stable, comfortable working environment is needed. The diffused light from the opal finish suits garden offices and hobby rooms, reducing screen glare and eye strain, while the improved insulation helps maintain a consistent internal temperature.

Pergolas and Covered Patios: Provides a cool, shaded outdoor living area with soft natural light rather than direct sun — particularly well suited to south-facing outdoor spaces that would otherwise be too bright and warm to use comfortably in summer.

Agricultural and Horticultural Buildings: The diffused light reduces hot spots and leaf scorching directly beneath the roof, making it a good option for larger greenhouse structures where even light distribution and heat retention are both important.

Benefits

Best Thermal Insulation in Our Range: A U-value of 1.60 W/m²K is the best thermal performance in our standard multiwall range — half the heat loss of 10mm twinwall and significantly better than 16mm triplewall. Combined with the opal tint's solar control properties, this sheet helps keep conservatories and covered spaces comfortable in both summer and winter.

Diffused, Glare-Free Light: The opal finish scatters incoming light evenly at 30% transmission, eliminating harsh shadows, hot spots and direct glare beneath the roof. The result is a softer, more comfortable environment particularly suited to living spaces and garden rooms.

Wider Rafter Spacing: Maximum rafter spacing of 1250mm gives greater flexibility in frame design and reduces the number of supporting rafters required compared to 16mm (1050mm) or 10mm (700mm) sheets.

Impact Resistance: 200 times stronger than glass and highly resistant to hailstones, wind-blown debris and accidental impact. Performance is maintained across a broad temperature range of -40°C to +100°C.

UV Protection: Co-extruded UV protective layer on the outer surface blocks over 98% of harmful UV radiation, preventing yellowing and loss of strength over time. Sheets must always be installed with the UV-protected side facing outward.

Lightweight: At approximately 3.4 kg/m², 25mm opal 7X wall is far lighter than glass, keeping structural load and on-site handling manageable despite the extra wall layers.

Technical Specifications

Helpful Guides

How to Install Multiwall Polycarbonate Roofing Sheets
How to Cut Multiwall Polycarbonate Sheets
How to Clean Polycarbonate Sheets
Sheet Calculator — Work Out How Many Sheets You Need
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Also Available In

25mm Clear 7X Wall Polycarbonate | 25mm Bronze 7X Wall Polycarbonate | 16mm Triplewall Polycarbonate | View Full Multiwall Range