Computes specified roof snow load per NBC 2020 4.1.6.2 with a full factor-by-factor breakdown.
2: S = Is·[Ss·(Cb·Cw·Cs·Ca) + Sr]. Derives the basic factor Cb from roof characteristic length, the slope factor Cs by roof type and slope, the wind exposure factor Cw, and the importance factor Is, returning S for ULS and SLS with a full factor-by-factor breakdown. Accepts ground snow Ss and rain Sr from the Climatic Data Map (deep-link prefill).
Basic balanced (non-drift) uniform roof snow only. Step, parapet, and obstruction drift accumulation, sliding/unbalanced and partial-load cases are not covered - use the dedicated snow drift and snow load case tools. Reduced wind-exposure Cw eligibility is the engineer's responsibility.
Ss and Sr are user-entered and must be confirmed against NBC Appendix C.
Use for preliminary uniform roof snow load. Verify climatic values, exposure eligibility, and all drift/accumulation cases before design use.
Other design checker in the same workspace.
Design a bent plate on a beam top flange to support a rooftop curb or duct, with plate, weld, and stiffener checks on a.
Design CheckerInteractive map lookup of NBC 2020 Appendix C climatic and Site Class C seismic values for major Canadian cities.
Design CheckerPreliminary CSA O86 CLT floor and roof panel design - continuous spans, point loads, live force diagrams, bending, rolling.
Design CheckerInteractive 3D anchor-group design aid to CSA A23.3-19 Annex D - screens steel, breakout, pullout/bond, pryout, and interaction.
Every tool ships inside the CoLateral desktop workspace, so a result can stay attached to the project, the drawing, and the review trail it belongs to instead of ending up in a loose spreadsheet.
Outputs are design aids and stay in draft until a qualified engineer reviews and approves them.