Why 4mm Twinwall Clear Polycarbonate is the Smarter Choice for Your Greenhouse

When building or upgrading a greenhouse, the material you choose for glazing plays a critical role in both performance and durability. While horticultural glass has long been a traditional choice, more and more gardeners and greenhouse owners are turning to 4mm twinwall clear polycarbonate sheets—and for good reason.
1. Superior Insulation
Unlike single-pane horticultural glass, 4mm twinwall polycarbonate features a dual-layer design with an insulating air gap. This significantly reduces heat loss, helping to maintain a stable internal temperature. That means warmer winters, cooler summers, and lower energy costs if you're using heaters or fans.
2. Outstanding Durability
Polycarbonate is up to 200 times stronger than glass, making it nearly unbreakable. It easily withstands evryday hail, heavy winds, and accidental impact—perfect for stormy climates or busy gardens with kids and pets. Say goodbye to shattered panels and expensive replacements.
3. Light Diffusion for Healthier Plants
The twinwall structure scatters light evenly throughout the greenhouse, reducing harsh shadows and hotspots. This diffused light is gentler on plants and promotes more uniform growth—something flat glass just can’t replicate.
4. Lightweight & Easy to Install
Polycarbonate sheets are significantly lighter than glass, making handling and installation easier, faster, and safer. You don’t need heavy-duty framing or special tools—just a bit of DIY spirit.
5. UV Protection Built-In
Marlon 4mm twinwall clear polycarbonate sheets come with UV-resistant coatings, protecting both the sheet itself from yellowing and your plants from harmful rays. It’s a long-term investment that holds up under the sun.

Special offer 4mm twinwall polycarbonate bundles