GLASS. This is the second most popular material. It is chosen due to aesthetic pathology. This coating is well suited for this type of room. You will have designs that will provide strength and light weight.

Minuses:
The material gets dirty quickly. Dirt and rain - all this will be very clearly visible on the material. It takes a huge amount of effort to maintain a greenhouse within reasonable limits. In addition, if you constantly clean the roof, it may simply be unsafe.

Price. If double-glazed windows and special frames are used for insulation, the price issue will be huge. It turns out that the construction of heat will be an unprofitable solution.
The material may harm your plants because... Glass does not have good thermal insulation. Moreover, such structures will transmit light, but not scatter it. This will have a negative effect on the leaves.