I am looking to build a backyard pergola. Total size of the pergola is 20 square meters.(5m length and 4M width ). The existing floor is concrete . What size posts should I use and what do I use to attach it to the concrete. The roof I would like to use clear roof sheeting. Any suggestions on this as well?
Clear roof sheeting is one of the many options you could consider. Remember, although you'll have fantastic light transmission, the heat transmission is exceptionally high on clear sheeting. So if this pergola was designed to make the area more comfortable in summer, you might want to think about something in the SolarSmart range instead.