| Deflections assumed in AS1684 | |||
| Element | Span Ratio | Absolute limit | Span which absolute limit governs |
| Floor Bearer | 300 | 12 | 3600 |
| Floor Joist | 300 | 15 | 4500 |
| Top plate | 200 | 3 | 600 |
| Bottom Plate | 200 | 3 | 600 |
| Lintel/ beam | 300 | 10 | 3000 |
| Rafter | 300 | None given | Bunnings use Similar as floor bearer |
| Ceiling joist | 400 | 12 | 4800 |
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