DK - Arches & Pergolas , 2000 Dorling Kindersley Limited
Post and Beam Pergola This drawing shows a standard pergola construction with square sawn posts in metal supports, supporting beams and evenly spaced rafters.
A freestanding wooden structure is probably the most common type of pergola. It is a simple construction of posts supporting beams and rafters. As with arches, many pergola kits are available today for the do-it-yourself market. Assembly of these is much simplified; members are pre-notched, edges are planed, and corner braces may even be glued into place for you. These instructions are for a kit with 8 feet (2.4 m) posts set 4 feet (1.2 m) apart left to right, and 22 inches (55 cm) deep.
hammer or mallet
4 spiked post supports
4 treated, sawn lumber posts, as supplied
2 lengths of treated, sawn lumber for beams, as supplied
4 lengths of treated, sawn lumber for rafters, as supplied
4 lengths of treated, sawn lumber for braces, as supplied
rustproof nails and galvanized screws
Knock both ends of one the crossbeams into the notches cut into the top of the two front posts, making sure the overhang is the same on both sides. Repeat with the back beam.
Once mounted on each corner post, the two parallel crossbeams are ready to receive the four overhead rafters. Keep in mind: It is better not to assemble large, heavy posts on the ground first.