Polycarbonate Glazing

Cutting Polycarbonate Glazing
High Quality Polycarbonate Glazing

Growing Spaces® offers two types of polycarbonate glazing for the Growing Dome® greenhouse kit to accommodate different climates. 5-Wall glazing (16mm thick) is the standard for all our kits because it will perform well in all climates. Twin-Wall glazing (8mm thick) can be used if your average minimum winter temperature is 15 to 20 °F, or warmer (USDA climate zone 8b or warmer). Twin-Wall glazing is only available for the 15’, 18’, 22’, and 26’ Growing Dome kits.

Our polycarbonate glazing is 100% recyclable and manufactured in Houston, TX. In order to minimize waste and lower the price, two of our domes have polycarbonate triangles with seams in them. The 18′ and 26′ Growing Domes are the only kits manufactured with glazing panels that have a few tip taped triangles.


Side by Side Comparison

ThicknessTwin Wall (8mm or 5/16in)Multi Wall (16mm or 5/8in)
Wall TypeTwin5-Wall RDC
R-Value1.7242.778
Light Transmission81%65%
Solar Heat Gain Coefficient0.820.68
Shading Coefficient0.940.78

Advantages of polycarbonate coverings

This greenhouse covering resists breakdown by ultraviolet light and harsh weather impacts, like hail. The greenhouse polycarbonate glazing has a life expectancy of over 20 years and comes with a 10 year pro-rated manufacture warranty for yellowing and hail damage. You and your plants will love the soft diffused light inside our Growing Dome greenhouses.

  • Great light transmission
  • Light diffusion/even light distribution – no harsh light or burning
  • Made in the U.S.A.
  • Resistance to U.V. rays and to hail
  • Energy saving
  • Economical
  • Versatile, lightweight, and easy to install or replace
  • Product contains pre-consumer recycled content
  • May qualify for LEED Tax Credits based on your area
  • Product is recyclable
  • Durable and long lifespan if properly cared for
  • 10-year pro-rated warranty
  • High impact resistance (200 times greater than glass)
  • RDC (Reinforced Double Co-extrusion) construction of 5-wall only
  • Classified in accordance with ASTM-E84 and -D1929 standards

Polycarbonate Fact Sheets: