Buyer beware:  This item is both difficult to assemble and not waterproof.  Ceiling leaks through at connection points, opaque panels are cheap and pliable.  Back horizontal support was bowed in 3 different places after putting together, causing roof panels to not slide in correctly.  The whole frame is extremely flimsy once assembled, even when bolted into the deck and attached to the back of the house.  Strong winds will cause rattling as the pergola bounces against the house.  Working on trying to return now, however the manufacturer is located in China, the language barrier seems to be causing some difficulty in explanation.  They want to replace the unit, which I appreciate but I would never install this again after having seen how it performs.  Spend more money on a nicer one.  You get what you pay for.