Timber Deck Span Tables

2 for design parameters refer to figure 7 26.

Timber deck span tables.

Span tables use the span tables below to determine allowable lengths of joists and rafters based on size and standard design loads. 3 where rafters are equal to or exceed four times their breath blocking should be used to reduce distortion. Wind classification n1 n2. If you will run decking at an angle you might need to put the joists closer together.

1 refer to general notes for information that is relevant for all span tables. Stress grades and timber sizes combine to determine the spanning ability of load carrying members. A maximum roof pitch of 25 degrees is assumed. You can also use the wood beam calculator from the american wood council website to determine maximum rafter and joist lengths.

The table accounts for wet service conditions and an incised lumber reduction for species commonly incised for pressure treatment penetration. Dimensional lumber deck beam span chart. Span tables allow users to choose an appropriate size and stress grade to achieve spanning needs. The table includes spans for common lumber species used for deck framing like southern pine douglas fir hem fir redwood western cedar and other species.

The numbers in gray indicate the distance between the support posts. Decking made of 2x4s or 2x6s can span up to 24 inches. Construction details should be in accordance with as1684 2. Deck bearer and joist span tables australia masuzi june 20 2018 uncategorized leave a comment 38 views how to build a timber deck page 2 how to build a timber deck page 2 low level deck bunnings work residential timber decks.

Joist and rafter span tables. Table 8 deck bearers seasoned timber floor load width size mm x mm bearer span mm 4 0 kpa uniform live load 4 5 kn point live load bearer span mm 5 0 kpa uniform live load 13 kn point live load single span continuous span single span continuous span. If you use 5 4 decking joists must be no farther apart than 16 inches. Pergola rafter spans for 600 mm and 900 mm spacing.

Framing span tables for all types of wood construction not just decks are given separately at framing tables spans where in addition to span tables for dimension lumber timbers we also give a rough rule of thumb that gives the span for a common 2x joist. For simple construction such as domestic construction this can be determined from span table supplements in as1684 2 and as1684 3. Decking boards span from joist to joist. A 2 2x10 can span 10 feet and so on.