Deck, Seat and Pergola Complex

The Plans

Specifications:

DeckA flat floored roofless area adjoining a house. Timber deck: An outside floor structure comprising of posts, bearers, joists and decking boards. posts: 100×100 (4×4) on 100mm (4″) conc pad. Max 1450 crsSee CENTERS (58″ O.C.On center; (See CENTERS))
PergolaA structure with open wood-framed roofs, often latticed and supported by regularly spaced posts or columns, and covered by climbing plants such as vines or roses, shading a walk or passageway. Pergolas are distinguished from “arbors,” which are less extensive in extent and structure. posts: 100×100 (4×4) on 100mm (4″) conc pad. Max 1450 crs (58″ O.C.)
Bearers: 100×100 (4×4) max spanThe horizontal distance between supporting structures. 1450mm (58″)
Ledger: 150×50 (2×6) bolted to house blockwork with galv bolts every 900mm (36″)
Joists: 100×50 (2×4) @ 450 crs.(18″ O.C.)

The posts needed to be treatedPressure treated. Refers to lumber that is treated in such a way that the sealer is forced into the pores of the wood. Refers to lumber pressure sprayed with chemicals to lengthen its life expectancy for outside use or inground applications. suitable for in ground application. The bearers needed to be treated suitable for in ground application because the deck was built close to the ground, and in some places the bearers would touch the ground.
The joists needed to be treated suitable for exterior use, as they did not touch the ground and air could circulate all around them.
The joists were spaced @ 450crs.(18″ O.C.)