When you call in builders for door and window replacement services, they will use a number of terms as they carry out their work. To the average person, a window might appear to be a single structure. However, it will have various components that any layperson might be unaware of. Similarly, when it comes to pergolas, these structures also feature a number of components. For the uninitiated, pergolas refer to freestanding outdoor structures placed in yards or gardens. Some homeowners might also attach pergolas to the main house.
Some of the various components that go into the construction of pergolas include:
- Rafters: These refer to the horizontal components that form the main part of the roof of the pergola. Builders will usually place these rafters 12 to 24 inches apart. In attached pergolas, builders will attach the ends of the rafters to the ledger board at one end, while sitting on top of the beam at the other. In freestanding pergolas, the rafters will sit on top of the beam on both sides.
- Ledger Boards: This denotes a piece of lumber anchored to the wall framing in attached pergolas. The length of this board will usually correspond to the length of the pergola. In addition, it’s height will be identical to the height of the rafters.
- Beams: In attached pergolas, the beams will typically run parallel to the ledger boards. In freestanding pergolas, two beams will usually run parallel to each other.
- Posts: These denote vertical support members. They will usually run from the footing to the beams. Attached pergolas will usually feature two posts i.e. one at each end of the beam. In contrast, freestanding pergolas will feature at least four posts.
- Footings: Workers engaged in providing building services will usually form footings by pouring concrete into a hole in the ground. These cylindrical concrete piers serve to support the posts.
- Purlins: These denote smaller pieces of wood that workers will usually place on top of the rafters. These are instrumental for providing additional shade. In many cases, the purlins will run perpendicular to the rafters.