Roofing Materials Calculator
Calculate exactly how many roof tiles, metal sheets, timber battens, screws and underlay you need for any roof. Enter your roof area and material type for a complete material list instantly.
🔨 Roofing Materials Calculator
📐 How It Works
Roofing materials are calculated from the true sloped roof area. Tiles are counted by coverage rate per m². Metal sheets are calculated from cover width. Battens are spaced to suit the tile gauge and run horizontally across the rafters. Underlay goes under tiles and battens.
📋 Worked Example
A 130 m² roof in concrete tiles: Tiles = 130 × 1.10 × 16 = 2,288 tiles. Battens at 330mm: 130 ÷ 0.33 = 394 lm of batten. Underlay = 143 m².
❓ Frequently Asked Questions
Standard concrete roof tiles cover approximately 15–17 per m² depending on the tile profile and gauge. Terracotta tiles: 12–16/m². Always use the manufacturer's specified gauge for accurate counts — the gauge (vertical spacing) determines how many rows per metre of rafter.
Standard Colorbond roofing sheet cover width is 762mm (nominal). Allow for laps — end laps of 150mm minimum and side laps of one rib. For the true cover width of your specific profile, check the manufacturer's datasheet.
Batten spacing (gauge) is determined by the tile manufacturer's specification for the roof pitch. For most concrete tiles at pitches 15–35°: 300–340mm gauge. Never exceed the manufacturer's maximum gauge — this affects weatherproofing. Always check the tile specification sheet.
Yes — sarking or roofing underlay is required under most tile and sheet roofing in Australia per AS 4200. It provides a secondary weather barrier and improves thermal performance. Allow 10–15% extra for laps and waste.