Research Article
Timber Portal Frames vs Timber Truss-Based Systems for Residential Buildings
Table 2
Summary of portal element costs.
| | Element/Case | Type | Length (m) | Price/lineal metre | Contingency | Price |
| | Purlins | | A | 120 × 35 mm MGP 10 | 35.19 | $2.96 | 20% | $124.99 | | B | 120 × 35 mm MGP 10 | 35.19 | $2.96 | 20% | $122.12 | | C | 120 × 35 mm MGP 10 | 35.19 | $2.96 | 20% | $124.99 |
| | Girts | | A | 120 × 35 mm MGP 10 | 19.44 | $2.96 | 20% | $69.05 | | B | 120 × 35 mm MGP 10 | 19.44 | $2.96 | 20% | $69.05 | | C | 120 × 35 mm MGP 10 | 19.44 | $2.96 | 20% | $69.05 |
| | Rafters | | A | 150 × 45 mm LVL 13.2 | 24.37 | $7.37 | 20% | $215.53 | | B | 150 × 45 mm LVL 13.2 | 18.28 | $7.37 | 20% | $161.65 | | C | 150 × 45 mm LVL 13.2 | 14.21 | $7.37 | 20% | $125.73 |
| | Columns A, B, and C | 90 × 90 mm F7 | 15.6 | $13.00 | 20% | $243.36 |
| | Mullions A, B, and C | 90 × 90 mm F7 | 9.1 | $13.00 | 20% | $141.96 |
| | Gussets A, B, and C | 20 mm plywood | $162.00 |
| | Consumables A, B, and C | Assume $100 for consumables | $100.00 |
| | | | | | Total cost | | | | | | | A | $1,056.90 | | | | | | B | $1,000.14 | | | | | | C | $967.09 |
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