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