calculate_roof_truss
Compute pitched roof truss dimensions, rafter length, and material quantities based on span, pitch, spacing, and load.
Instructions
Calculate roof truss dimensions, rafter length and material quantities for a pitched roof. See list_bundles for related 'construction' calculators.
Input Schema
TableJSON Schema
| Name | Required | Description | Default |
|---|---|---|---|
| span_m | Yes | Total roof span in meters (full width) | |
| pitch_degrees | Yes | Roof pitch angle in degrees | |
| spacing_cm | No | Distance between trusses/rafters in cm (default 60cm) | |
| load_kg_m2 | No | Total roof load in kg/m² including snow, wind and tiles (default 150) |
Output Schema
TableJSON Schema
| Name | Required | Description | Default |
|---|---|---|---|
| result | No | Computed result. Object whose fields depend on the tool (e.g. {tax, marginal_rate, brackets} for tax tools, {volume_l, gallons} for volume tools). | |
| formula | No | Human-readable formula or method used (e.g. "I=P·r·t", "Magnus formula"). | |
| source | No | Authoritative source for the rule or formula (e.g. "Article 197 CGI", "NF DTU 21"). | |
| reference_url | No | Link to a calcul2 page documenting the calculation in detail. |