The strength is amazing. It has stood up to a foot of snow on the roof as well as heavy rain, hail and howling winds. It's been great for getting seeds started and getting seedlings ready for transplant. The roof trusses have held plenty of weight as well. I was able to hang 8 hanging baskets as the seeds were getting up and going and I probably could have hung at least 4 more. My mom bought one of these a couple of years ago and it's still doing great. I was so impressed with it that I bought one for myself this year. Thanks for a great product! Also, this greenhouse was very easy to put together. My wife and I had this together in less then 15 minutes.