Greenhouse Glazing, 4mm Twinwall Polycarbonate

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Greenhouse Glazing, 4mm Twinwall Polycarbonate
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Twin wall polycarbonate is virtually unbreakable and easy to handle, so its safe for the whole family. Its also easy to cut with a Stanley knife which makes it ideal for replacement glazing. It provides good insulation from frost and maintains a more even temperature for better plant growth. Twin wall polycarbonate also diffuses light to prevent scorching. With good light transmission properties it is no surprise that this versatile glazing material is so popular in greenhouse glazing. The standard sheet size is approximately 4'x2' (1215x617mm) which gives you the option to do away with glass overlaps. The sheets are a similar size to two standard 24"x24" sheets of overlapping horticultural glass, which makes replacement easier.

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  • Virtually unbreakable
  • Good insulation from frost
  • Maintains a more even temperature than glass
  • Diffuses light to prevent scorching
  • High light transmission properties
  • Easily cut to any shape or size with a Stanley knife
  • Easily fitted with standard greenhouse glazing clips
  • Easily overlapped at joins with standard greenhouse overlap clips
  • Existing clips and gaskets can be reused
  • Sheet size approximately 4'x2' (1215mm x 617mm) - similar size to two standard 24"x24" sheets of horticultural glass


Twin wall polycarbonate glazing is far stronger than the flimsy single skin polycarbonate sheeting supplied with some greenhouses. Twin wall polycarbonate is often used in conservatory roof glazing because it is a stable and long lasting glazing material which does not significantly alter with the passage of time. These sheets can be cut in half to provide 2 sheets approximately 24"x24". Our standard sheets can also be used to replace two standard 24"x24" sheets of horticultural glass.

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