Measures · Roof pitch
Minimum roof pitch FREE
Work out the minimum pitch of the roof slopes by type of covering. Below the result you find the formula and the standard.
Indicative pre-sizing. It does not replace a structural calculation signed by a licensed engineer. For seismic zones with agS (design ground acceleration) > 0.15g, long spans or use classes III/IV → talk to a structural engineer.
Pick a calculation from the list to start.
Formula, example and standard
UNI 9460:2008
Example with the starting values (Roof covering: Clay tiles): Minimum pitch: 35% (≈ 19°). Always check local landscape protection rules.
- Tiles / coppi: UNI 9460:2008 sets a minimum pitch to keep the water out.
- Standing-seam metal: a low pitch is fine.
- Bitumen membranes: flat roofs with a minimum 1.5% slope.
Source: UNI 9460:2008 · UNI 8627 · UNI EN 14782 · unionearchitetti.com
Indicative pre-sizing: it does not replace a calculation signed by a licensed engineer.
The other calculations
Timber beamSteel IPE beamReinforced concrete beamReinforced concrete columnSteel columnTimber columnRC cantilever / balconyLintelClay block and concrete slabTimber floorPredalles slabLoad-bearing brick wallPartition wallStaircaseMinimum room heightWindow-to-floor ratioEscape route widthNumber of toiletsNTC imposed loadsExternal insulationVentilated crawl space