8mm Twinwall Polycarbonate Sheet

$76.16 - $124.80
Shipping calculated at checkout.

Built for strength and energy savings, the 8mm TwinWall polycarbonate sheet is perfect for greenhouses, patio covers, and outdoor projects needing reliable insulation and light control. Choose Clear for maximum light, PoliSoft Diffused for soft, plant-friendly light, or Bronze for added shade and privacy—ideal for optimizing both plant health and comfort in any environment.

Color: Bronze
Size: 4ft x 8ft
Fulfillment Method: Shipped
Regular price $80.00
Regular price Sale price $80.00

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Availability:
SKU: B1615-4x8
Collections:
Regular price $80.00
Regular price Sale price $80.00

The 8mm (5/16 inch) Polycarbonate Sheet offers superior insulation and versatility, making it a preferred choice for greenhouses, outdoor structures, and patio covers. With TwinWall technology, air channels between the walls help maintain warmer temperatures, reducing energy costs and protecting your plants in cooler weather.

Choose among three shades for different effects:

  • Clear: Provides high light transmission and clarity.
  • PoliSoft Diffused: Creates gentle, scattered light that reduces glare and provides an ideal growing environment, especially in high-sun areas (such as the southern USA or high elevations). Only available in 8mm thickness.
  • Bronze: Perfect for an attractive, shaded effect that provides added privacy and reduced glare.

Heat Savings: The Twinwall design with internal channels traps air, providing an insulating layer that helps maintain stable temperatures and reduces heating costs.

UV Protection: All colors are UV-protected on one side to resist yellowing and damage from prolonged sun exposure. 

Condensation Reduction: PoliSoft Diffused and Bronze options reduce condensation build-up, ideal for high-humidity areas like greenhouses and covered patios.

Specifications

Thickness: 8mm (5/16 inch)
Size: 4ft x 8ft, 4ft x 10ft, 4ft x 12ft 
Custom Sizes Available: Widths up to 6 ft, Lengths 2ft - 24 ft
Colors: Clear, PoliSoft, Bronze
R-Value: 1.7
Light Transmission: Clear 81%, PoliSoft Diffused 79%, Bronze 42%
Material: Polycarbonate

Dimensions may vary by +/- 1/8".

Installation Tips:

  • Install panels with the flutes (channels) running vertically to maximize strength. End caps or vented tape are recommended to allow moisture to escape while protecting against condensation.
  • One side of the polycarbonate sheet has a UV-resistant coating. The printed or Blue side is the UV-resistant side. Be sure to install sheet with this side facing the sun to receive benefits and keep panel from yellowing.

Shipping Method: Motor freight

Delivery Estimate: Please allow 2–3 weeks

Contact us for custom sizes or a freight quote at 888-977-7659 or via quote request.

  • 30-day satisfaction guarantee

  • 10-year warranty on material defects

  • Fast & reliable shipping across the USA

  • Knowledgeable product support