Roofing

Pitch, rafter length, area and materials.

• Gutter and Downspout Calculator Gutter length, brackets and how many downspouts a roof needs, based on the area each one can drain.
• Metal Roofing Panel Calculator Metal roofing panels, screws and ridge flashing from the roof dimensions and panel cover width.
• Rafter Length Calculator Common rafter length from the span and pitch, with the overhang, the plumb cut angle and the number of rafters.
• Ridge Height Calculator How high the ridge of a roof sits above the wall plate, and above ground, from the span and pitch.
• Roof Area Calculator The real sloping area of a roof from its footprint and pitch, in square metres, square feet and roofing squares.
• Roof Pitch Calculator Converts roof pitch between rise-over-run, degrees and ratio, and gives the slope factor for working out the real roof area.
• Roof Weight Calculator (Dead Load) The dead weight of a roof build-up in kg/m² and in total — useful when comparing coverings. Not a structural capacity check.
• Roofing Underlayment Calculator Rolls of roofing felt or synthetic underlayment for a roof, allowing for the horizontal and vertical laps.
• Shingle Calculator Shingle bundles and squares for a roof, with the starter course, ridge caps and nails.