Roofing Sheet Calculator
Calculate total metal, GI corrugated, tin, or polycarbonate roofing sheets with side overlaps and cost estimates.
Roof Slope & Structure
Sheet Specs & Rate
480 sq.ft (Single Slope)
Complete Guide to Roofing Sheet Estimation & Installation
Whether constructing a warehouse, factory shed, car parking canopy, or residential terrace top roof, calculating the exact quantity of roofing profile sheets prevents unnecessary material waste and structural overweights.
Calculation Formula
- Effective Sheet Width = Nominal Width - Side Corrugation Overlap
- Sheets per Row = Math.ceil(Ridge Length ÷ Effective Width)
- Slope Length = Rafter Length + Eaves Overhang (Front & Back)
- Total Sheets = Sheets per Row × Number of Roof Slopes
- Total Running Feet = Total Sheets × Sheet Length
- Fastener Screws = Total Sheets × Purlin Rows × 2 Screws/Purlin
Popular Roofing Sheet Profiles
- Color Coated Galvalume / PPGL: 0.45mm - 0.50mm thickness, lightweight, rust-proof with 15+ years lifespan.
- Corrugated GI Sheets: Traditional galvanized iron sheets, heavy-duty for agricultural sheds.
- Polycarbonate / FRP Skylights: Multiwall transparent sheets offering natural daylighting.
- UPVC Multi-Layer Sheets: Thermal and acoustic insulation, corrosion-proof for chemical factories.
Frequently Asked Questions (FAQs)
What is the standard overlap for color-coated metal roofing sheets?
For side overlaps (corrugation side crest), a standard 1 crest overlap (~2.5 to 3 inches) is required with sealant tape. For end-to-end lengthwise overlaps, leave 6 to 8 inches (150mm to 200mm) depending on the roof slope angle.
What is the recommended purlin spacing for 0.5mm Galvalume sheets?
Standard purlin spacing (distance between MS pipe or C-channel roof supports) should be 3.5 to 4.5 feet (1.0m to 1.4m). Exceeding 5 feet can cause metal sheets to sag or buckle under heavy wind and rainwater loads.
How many self-drilling screws are required per roofing sheet?
Typically, install 1 self-drilling fastener with EPDM rubber washer on every alternate crest per purlin support. On average, budget 6 to 8 screws per 10-foot sheet length (approx 4 to 5 screws per square meter).