That’s a smart question, because not all outdoor benches are built the same. Let me break it down for you based on real-world use.
Plastic Benches (Resin / Polyethylene / Recycled Plastic)
High-quality plastic benches are engineered to handle direct sunlight. The key is the material: UV-stabilized polyethylene or polypropylene. These are infused with UV inhibitors that prevent the polymer chains from breaking down under intense rays. In my experience, a good UV-resistant plastic bench won’t crack or become brittle for at least 3 to 5 years, often longer. However, cheap plastic—the thin, low-density stuff—can fade, become chalky, and develop hairline cracks after a single summer. So, look for benches that specifically say “UV-protected” or “all-weather resin.” They do get hot to the touch in direct sun, but they won’t crack.
Wood Benches (Teak, Cedar, Eucalyptus, or Pressure-Treated Pine)
Wood naturally expands and contracts with temperature changes. Under constant direct sunlight, the surface dries out faster than the inner layers, causing micro-cracks and eventually splits. The species matters hugely. Teak and cedar have natural oils that resist drying and cracking—they can go years without cracking, though they will turn silver-gray (which is a cosmetic change, not a structural failure). Pressure-treated pine? It’s more susceptible. Without regular sealing or staining, you’ll likely see surface checks and small cracks within 12 to 18 months. The good news? Surface cracks in wood are often superficial—they don’t cause bench failure. But to prevent deep splits, you must apply a UV-blocking wood sealer annually.
The Verdict After a Year
- Plastic: A quality UV-stabilized plastic bench will not crack after one year. Cheap plastic may show signs of brittleness or fading.
- Wood: A correctly sealed teak or cedar bench can survive a year without cracking. Unsealed pine or low-cost hardwood will almost certainly develop surface cracks (checks) within a year, and possibly deeper splits if the climate is very dry and hot.
Quick Maintenance Tips to Extend Life
For plastic: Wash it with soap and water; avoid harsh solvents.
For wood: Apply a UV-protective stain or sealant every 11–12 months, especially before summer.
So, to answer your concern directly—if you choose quality materials and maintain them, neither plastic nor wood will structurally crack after a year. But if you just buy the cheapest option and leave it in the full sun, expect trouble.