Weatherguard™ Arched Roof Greenhouse - Walk In Backyard Hobby Greenhouse - Triple ridge pole roof system safely supports the heaviest hanging plants. All-steel construction with flex frame design and 1-1/4”, 16-gauge steel for stability. 14-gauge inside steel slip fitting joints for rugged rigidity and easy setup. Galvanized bases bolt to foundation for optimal wind-resistance. This walk-in hobby greenhouse will help protect outdoor plants or herb gardens during the winter. Get an early start on the growing season. Add freestanding shelves (sold separately) to increase your storage and work space.