Here they share a great tip on Deck Construction:
When it comes to deck construction, there are several options to consider when building the structure. Some of these options are: joists, beams, post size, supports, and spacking; decking thickness, guard railing height and spindle spacing.
- Joists are used to support the decking surface material that is walked on. The size and spacing are directly proportional; that is, as the size of the joist increases, the allowable spacing also increases. Larger joists can carry a larger load, so fewer joists are required.
- Beams are provided to support the end and sometimes middle of the joists to reduce excessive vertical flexing and side to side (lateral) movement. As with the joists, the size and spacing of the beams are directly proportional.
- Deck posts transfer the load from the beams to the ground, which is a very important job. Deck posts should be at least 15 ¼ cm x 15 ½ cm (6"x6") unless the deck is very close to the ground. Large decks may require larger posts, or posts spaced closer together.
In most cases, your clients need to get building permits for their decks. Some municipalities only require a permit if the deck is a certain height above ground or if it is anchored to the house. In addition to local building department requirements, the local planning and zoning department should be consulted to confirm if there are any limitations.a