Gutter, downpipe & overflow design
Design depends on rainfall intensity, roof geometry, gutter profile, outlets and compliant overflow provisions.
Roofing tools & calculators
4 tools to prepare measurements, estimate quantities and plan your next conversation with a trade professional.
Roofing
Roofing budget
Build a planning range using measured area and your own installed rates.
Open calculator RoofingGuttering budget
Estimate a linear installation budget with downpipes and extras.
Open calculator RoofingRoof pitch & slope geometry
Convert known rise and horizontal run into angle and slope length.
Open calculator RoofingRectangular roof sheet quantities
Count full-length sheets using the selected profile’s effective cover.
Open calculatorPrepare your measurements
Use professional measurements or drawings. Roof surface area differs from horizontal catchment area; check which the tool needs.
Confirm before you commit
Confirm pitch suitability, laps, flashings, access and drainage design with the roofing contractor.
Lysaght technical installation manual