Thus, for 2.5m span you will need a 47×120 mm size of joists at standard 400 mm spaced. What size joist to span 2.5mĪs per general thumb rules and guideline, a 47×120 mm size of floor or roof joists can allows spans up to 2.5 metres for permanent loads are assumed to be 50 kg/m2 and imposed load of 150kg/m2 when spaced 400mm apart. Thus, for 2m span you will need a 47×95 mm size of joists at standard 400 mm spaced. If the floor system is to be tiled or there are any other unusual loading conditions, I’d recommend having an engineer review the conditions.Īs per general thumb rules and guideline, a 47×95 mm size of floor or roof joists can allows spans up to 2 metres for permanent loads are assumed to be 50 kg/m2 and imposed load of 150kg/m2 when spaced 400mm apart. Typically, this thumb rule work better for permanent loads are assumed to be 50 kg/m2 and imposed load of 150kg/m2, and this rule of thumb will work for loading conditions that don’t exceed that value. it’s important to use the actual engineered wood dimensions, not the nominal dimensions). Example, for a 4m span, half this is 2m, add 50mm, which gives 250 for the depth. The thumb rule for the depth of common joists is to take half span in meters to this number add 50mm for the depth of the joist in mm. What size joist to span 3m, 3.5m, 4m, 4.5m and 5 meters
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