• Description

Common Domestic Ceiling Joists Sizes

 

Strength Class C16

When sizing the timbers within the ceiling it is important that the correct size of joists are used. The tables below give some of the standard timber sizes and their spans.

Suitable for Joists laid at 400mm centres

Span in meters

Joist Size mm (depth x width)

1.97

97x50

2.37

122x38

2.60

122x50

3.39

147x50

4.06

170x50

4.79

195x50

5.52

220x50

<>Strength Class C24

Span in meters

Joist Size mm (depth x width)

2.08

97x50

2.50

122x38

2.81

122x50

3.56

147x50

4.25

170x50

5.01

195x50

5.77

220x50

NOTES:

All structural timbers are to be Kiln Dried