That's an excellent question for any rooftop gardener! The material you choose for your outdoor trash bin is crucial because it faces sun, rain, wind, and temperature swings. Here’s a natural breakdown from my own experience and research.
For most rooftop settings, stainless steel is often the top contender. It's incredibly durable, rust-resistant (especially grade 304 or 316), and has a sleek, modern look that complements urban gardens. It won't fade in the sun and is easy to wipe clean. The main downside is it can get hot to the touch and might show water spots.
Heavy-duty plastic resins (like polyethylene) are a popular and budget-friendly choice. Look for UV-protected versions to prevent fading and cracking. They're lightweight and won't rust, but strong winds can sometimes tip lighter models over. They can also become brittle over many years in intense sun.
Another fantastic option is powder-coated galvanized steel. It offers the strength of steel with a baked-on finish that provides extra protection against corrosion and comes in various colors. Just ensure the coating is high-quality to avoid chips that could lead to rust.
For a natural look, weather-treated wood bins can blend into garden decor, but they require more maintenance to prevent rot.
My personal take? For a low-maintenance, long-lasting solution, go with a stainless steel or a high-quality powder-coated bin. Ensure it has a secure, tight-fitting lid to keep pests out and prevent wind from scattering debris. Also, consider anchoring it or choosing a model with some heft if your rooftop is particularly windy.
Hope this helps you find the perfect bin for your beautiful green space