Can insect get inside of the shed? And is it ok to place on top of concrete?

Thanks for your interest in our products! Our sheds are made of durable, weather-resistant materials and are designed to withstand most weather conditions. The design of the shed is not airtight and allows for ventilation. We cannot guarantee protection against insects. To ensure proper assembly and performance your shed needs to be built on a solid, level surface. We recommend a concrete or patio surface, or a treated wood platform.