Diagram — what is being calculated
01 / Inputs
Perpendicular distance from bearer to nearest parallel load-bearing line on plan (NZS 3604 cl. 1.3).
Enter your actual pile spacing to check adequacy. Leave blank to view max spacing only.
Loaded dimension (NZS 3604 cl. 1.3): The horizontal plan distance from the bearer to the nearest parallel load-bearing line. For joists framing into the bearer, this equals half the joist span (or half the maximum joist span where joists are continuous). The 2.0 kPa values are derived from NZS 3604:2011 Table A6.4 and are approximately 5–10% lower than the 1.5 kPa values.
02 / Result
Enter inputs to calculate pile spacing
All bearer sizes for entered loaded dimension
| Size (width×thickness) | Loaded Dim (m) | Max Pile Spacing | Adequate? |
|---|
NZS 3604:2011 — scope and limitations. Applies to solid timber bearers continuous over two or more spans in timber-framed buildings within NZS 3604 scope. Tables are for 1.5 kPa and 2.0 kPa floor loads. Wet-in-service conditions reduce spans — refer to NZS 3604:2011 Table 6.4 Note 2. Buildings outside NZS 3604 scope or with H5/H6 exposure require engineering design. All results must be verified by a Chartered Professional Engineer or Licensed Building Practitioner.
NZS 3604:2011 Table 6.4 — Bearer Maximum Pile Spacing (mm) @ 1.5 kPa, Continuous
Loaded dimension in metres. For 2.0 kPa, spans are approximately 5–10% lower (derived from NZS 3604:2011 Table A6.4). Source: NZS 3604:2011 Table 6.4.
| Size (mm) | LD 1.2 | LD 1.5 | LD 1.8 | LD 2.1 | LD 2.4 | LD 3.0 |
|---|---|---|---|---|---|---|
| 90×70 | 1200 / 1300 | 1100 / 1200 | 1000 / 1100 | — / 1000 | — / — | — / — |
| 90×90 | 1500 / 1600 | 1400 / 1500 | 1200 / 1400 | 1100 / 1200 | 1000 / 1100 | — / — |
| 140×70 | 2000 / 2150 | 1900 / 2050 | 1700 / 1850 | 1550 / 1650 | 1400 / 1550 | 1100 / 1200 |
| 140×90 | 2450 / 2650 | 2300 / 2500 | 2100 / 2250 | 1900 / 2100 | 1700 / 1900 | 1350 / 1500 |
| 190×70 | 2700 / 2900 | 2500 / 2700 | 2300 / 2500 | 2100 / 2250 | 1900 / 2100 | 1500 / 1650 |
| 190×90 | 3200 / 3450 | 3000 / 3250 | 2750 / 2950 | 2500 / 2700 | 2300 / 2500 | 1850 / 2000 |
| 240×90 | 3800 / 4100 | 3600 / 3850 | 3300 / 3550 | 3000 / 3250 | 2750 / 3000 | 2200 / 2400 |
| 290×90 | 4400 / 4750 | 4150 / 4500 | 3850 / 4150 | 3500 / 3800 | 3200 / 3500 | 2600 / 2800 |
Values shown as SG8 / SG10. Table 6.4 applies to bearers continuous over 2+ spans.
NZS 3604:2011 Table A6.4 — Bearer Maximum Pile Spacing (mm) @ 2.0 kPa, Continuous
Loaded dimension in metres. Source: NZS 3604:2011 Table A6.4.
| Size (mm) | LD 1.2 | LD 1.5 | LD 1.8 | LD 2.1 | LD 2.4 | LD 3.0 |
|---|---|---|---|---|---|---|
| 90×70 | 1100 / 1200 | 1000 / 1100 | 900 / 1000 | — / 900 | — / — | — / — |
| 90×90 | 1350 / 1450 | 1250 / 1350 | 1100 / 1250 | 1000 / 1100 | 900 / 1000 | — / — |
| 140×70 | 1800 / 1950 | 1700 / 1850 | 1550 / 1650 | 1400 / 1500 | 1250 / 1400 | 1000 / 1100 |
| 140×90 | 2200 / 2400 | 2100 / 2250 | 1900 / 2050 | 1700 / 1900 | 1550 / 1700 | 1200 / 1350 |
| 190×70 | 2450 / 2650 | 2250 / 2450 | 2100 / 2250 | 1900 / 2050 | 1700 / 1900 | 1350 / 1500 |
| 190×90 | 2900 / 3100 | 2700 / 2950 | 2500 / 2700 | 2250 / 2500 | 2100 / 2300 | 1700 / 1800 |
| 240×90 | 3450 / 3700 | 3250 / 3500 | 3000 / 3200 | 2750 / 2950 | 2500 / 2750 | 2000 / 2200 |
| 290×90 | 4000 / 4300 | 3750 / 4100 | 3500 / 3750 | 3200 / 3450 | 2900 / 3150 | 2350 / 2550 |
Values shown as SG8 / SG10. Approx. 5–10% lower than 1.5 kPa (Table 6.4).