6mm (1/4") Polycarbonate Sheet - TwinWall Leaf

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Poly 101 PDF - How To Install Polycarbonate Panels

Our most versatile and popular polycarbonate panel

CLEAR* 6mm (1/4") TwinWall polycarbonate is one of the most cost-effective greenhouse coverings available. It is popular because of its insulation value, light weight, toughness, easy handling, rigidity, long service life, high light transmission, and neat appearance. Use TwinWall for new construction or reglazing an existing greenhouse. It is an excellent replacement for single-pane roof glass. Most aluminum and glass greenhouses can easily be insulated with TwinWall using the existing glazing clips or bar caps. 

Heat Saving: TwinWall channels trap air between 2 walls. This gives up to 50% energy savings over single-wall coverings, keeps your plants warmer, and reduces heating costs. 

* Also available in Opal and Bronze.

Installation: The flutes (channels) run the length of the panel. Install panel with flutes vertical. Panel ends should be capped or sealed with a vented tape that allows interior condensation to escape. Dimensions + or - 1/8".

6mm (1/4") Clear Opal Bronze
Light Transmission 80% 57% 42%
R- Value 1.6 1.6 1.6

10-year limited warranty on properly installed Multi-Wall polycarbonate against

  • premature yellowing
  • a loss of more than 10% of the original light transmission
  • breakage of the top layer caused by 1” hail
  • warranty may vary with different manufacturers

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Opal & Bronze Polycarbonate

The white tint in Opal provides a pleasant light diffusion that reduces glare and overheating. Unlike the Bronze panel, Opal allows more of the growing light spectrum needed by plants for healthy growth.

Opal is recommended for roof applications, especially in Southern states, and at higher elevations where solar radiation can be intense. The insulating, internal air space reduces condensation, making it ideal for a patio roof.

Bronze tint is attractive and is ideal for patio roof and walls. It provides shading, privacy, and minimizes condensation.

4 Reviews Hide Reviews Show Reviews

  • 5

    Posted by barry mueller on Nov 29th 2023

    Panels are very good quality, and worked great. purchased a lot.

  • 5

    Posted by barry mueller on Nov 13th 2023

    Great product, used a LOT of it!

  • 5

    Posted by deirdre on Oct 25th 2023


  • 5

    Posted by larry c tingley on Aug 17th 2022

    have had the 6mm material around my rear deck for the last 6 years. it works extremely well at letting the sun in and keeping the wind and weather out. made into removeable panels, it is put up every fall and taken down in the late spring. has no known wear and survived wind gust of 60 mph. built a new green house and i am planning on putting this same material on the walls.