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Steel roof deck and open web steel joist is the predominate roof system in the United States for large flat roof structures. This system is the preferred choice of developers for its simplicity, strength, fire resistance, and
Find the column for your dead load and spacing, and the row for your timber size to find the permissible clear span in metres. Click on a span to generate a full calculation (you can adjust the exact span). This span table is to the format and methodology given in BS 5268-7.2.
Construction details should be in accordance with AS1684.2: Residential Timber-Framed Construction. A maximum roof pitch of 25 degrees is assumed. TECHNICAL DIAGRAM
Find the column for your dead load and spacing, and the row for your timber size to find the permissible clear span in metres. Click on a span to generate a full calculation (you can adjust the exact span). This span table is to the format and methodology given in BS 5268-7.2.
The most common flat roof joist sizes tend to be 150 x 50mm, 175 x 50mm and 200 x 50mm. The spacing will depend on the span and loads, but usually we can see flat roof joist spacing between 400mm and 600mm centres.
Span Tables for Flat Roof Joists (to BS 5268-7.2) Imposed loads of 0.75 kN/m² for maintenance and snow load are applicable where there is no permanent access (no fixed ladder or staircase) and most areas where the altitude does not exceed 100 metres (refer to BS 6399-3)
The following tables give details of the allowable spans and spacing for some of the more common timber sizes used in ceiling and flat roof construction. All the figures are based on the...
