Multiwall Polycarbonate

Twin wall is the most economical grade of multi-wall sheet available. It comes with a manufacturer’s 10-year warranty, as does triple wall and five wall. Twin wall is available in 4mm, 6mm, 8mm and 10mm thicknesses. Most pre-fabricated greenhouse kits are manufactured with 6mm (1/4-inch). Sheet thickness can be upgraded to meet specific climate weather conditions and local building code specifications.

Triple wall panels are available in 8mm, 10mm and 16mm and provide more panel rigidity and thermal insulation than the thinner twin-wall panels. The same product characteristics apply to the triple wall as do all polycarbonate panels.

Five wall polycarbonate panels are available in 16mm and 25mm. They have a significant improvement in thermal insulation properties over the twin and triple wall panels while only having a minimal drop in light transmission. Although thicker and more rigid, many folks are upgrading to 16mm (5/8-inch). The thicker panels are not as frequently used in horticultural applications, but they are available for those unique applications where superior strength, durability, and thermal insulation properties are desired.

While increasing thermal insulation properties, triple wall and five wall panels have good light transmission and are also very flexible to work with. In comparison to glass, they are still the best glazing product to use for any outdoor glazing project.