Timber Deck Span Tables

They also tell you what the maximum spacing should be between each section or timber member SIZE OF JOISTS mm CLEAR SPAN C16 JOIST M CLEAR SPAN C24 JOIST M 47 X 95 47 X 120 47 X 145 47 X 170 47 X 195 47 X. A typical domestic deck system is shown in Figure 1.

Floor Joist Span Table Roof Trusses Pier And Beam Foundation Flooring

Construction details should be in accordance with AS16842.

Timber deck span tables. TECHNICAL DIAGRAM Span Tables F7 Rafters ON PAGE 35 30mm M AXIMUM ALLOW ABLE SP ANS mm Sheet Roof Spacing mm Rafter Size 600 760 900 1000 1200 66 x 30 1250 1150 1050 1000 950 90 x 30 1650 1550 1550 1400. Wind Classification N1 N2. Eam selection for supporting two spans as per Tables 6a 6b 7a and 7b.

This will allow the decking and substrate to dry out. Other more complex load condition spans can be determined with our free Hyne Timber Design 75 software. Deck joist allowable spans as per Tables 2a 2b 3a and 3b.

For simple construction such as domestic construction this can be determined from span table supplements in AS16842 and AS16843. Joist and Beam Span Tables. Floor Load Width Size mm x mm Bearer Span mm - 40 kPa Uniform Live Load 45 kN Point Live Load Bearer Span mm - 50 kPa Uniform Live Load 13 kN Point Live Load Single Span Continuous Span Single Span Continuous Span.

Decks in this category are designed to withstand distributed loads of 30 kPa and point loads of 18 kN refer to AS11701①. Beam span maximums are based on a maximum anticipated. Notes to Joist Span Tables 03 - 04 These span tables follow the principles of BS 5268-71.

Reproduced with permission from TRADA Timber Research and Development Association. The grade and species of lumber size of lumber and the load it carries. Pergola Rafter Spans for 600 mm and 900 mm Spacing.

Simplified span tables for Southern Pine lumber and glued laminated timber glulam headers beams and girders. 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. Decking shall comply with AS 4785 - Timber - Softwood - Sawn milled products.

Listed are 46 tables based on common loading conditions for floor joists ceiling joists and rafters. View Size Selection Tables. Hyne Timber Design 75 is a free Timber design packag.

This video shows you how to use Hyne Timber Design 75 to calculate the span required for a deck joist. SPAN TABLES Span tables can be used to determine the size of a timber member of a particular strength class required for a given span. 3 Where rafters are equal to or exceed four times their breath blocking should be used to reduce distortion.

A maximum roof pitch of 25 degrees is assumed. JOISTS DECKING SPACING BETWEEN PILES ALONG THE BEARER MAXIMUM SPAN OF PILES BEARER SIZE 145M 100 x 75mm 235M 100 x 100mm or two 100 x 50mm. You can also use the Wood Beam Calculator from the American Wood Council website to determine maximum rafter and joist lengths.

Hardwood 10 to 18 Softwood 10 to 15. Span tables allow users to choose an appropriate size and stress grade to achieve spanning needs. Floor joist slab loading has not been included.

2 For design parameters refer to figure 726. The span of a beam is dependent on a few variables. Timber decks used for domestic purposes.

Tables are not valid if joists span continuously over more than two supports. Eam selection for supporting a single span as per Tables 4a 4b 5a and 5b. View Allowable Load Tables.

Table 2 Maximum joist spacing for various decking boards Decking Stress Grade Thickness mm Maximum joist spacing mm Hardwood Standard Grade AS 27961 19 500 Cypress Grade 1 AS 1810 19 400 21 450 Treated Soft wood Standard grade AS 47851 19 400 22 450 Source. 1 Refer to general notes for information that is relevant for all span tables. TABLE 8 - DECK BEARERS - SEASONED TIMBER.

A dead load of 025 kNm² has been included for self-weight of construction. Fewer posts on upper-level decks are typically more desirable to the occupants and this drives the use of larger framing materials for longer spans. TABLE 2 - TIMBER POSTS1 SUPPORTING ROOF ANDOR FLOOR LOADS.

Beam Span Chart Table. TQ recommends a maximum MC of 15 for residential decking. Where possible the design should allow for as much airflow as possible.

Table 2 gives maximum span of the common decking board ti mbers and thicknesses. Span Tables for Purlin Supporting Rafters to BS 5268-76 Imposed loads of 075 kNm² snow load are applicable to most areas where the altitude does not exceed 100 metres refer to BS 6399-3 Imposed loads of 1 kNm² snow load are applicable to most areas where the altitude exceeds 100 metres but does not exceed 200 metres but excluding parts of Scotland Pennines North East England refer to BS. Decking performs better and lasts longer if it has good ventilation under it.

This includes decks associated with Class 1 and 10 buildings as defined in the Building Code of Australia. For decks 600mm or more above ground level support posts should be of strength graded material. The detailed structural design for an individual deck will need to be confirmed by an appropriately qualified engineer.

Use the span tables below to determine allowable lengths of joists and rafters based on size and standard design loads. Decking boards shall be seasoned to the requirements of the applicable Australian Standard ie. 1989 Structural use of timber - Domestic floor joists.

View Joist Rafter Tables.

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