🏠 Calamine / Roofing Sheet Calculator

Free calamine / corrugated roofing sheet calculator: how many sheets you need, with lateral and longitudinal overlap, screws and ridge caps. Choose sheet direction and view a 2D/3D plan. No sign-up.

🏠 How to Calculate Calamine / Roofing Sheets

Corrugated metal roofing (calamine) calculation requires accounting for lateral and longitudinal overlaps, sheet direction, and waste factor. This calculator ensures you order the exact amount of material needed for your roofing project.

πŸ“ Sheet Calculation

Sheets across = Roof width Γ· Effective sheet width. Sheets along = Roof length Γ· (Sheet length - Longitudinal overlap). Total = Across Γ— Along + waste.

πŸ”— Overlap Calculation

Lateral overlap: 1.5 corrugations (β‰ˆ15cm). Longitudinal overlap: 15-20cm minimum. Steeper slopes allow less overlap; flatter roofs need more.

πŸ”© Fastener Calculation

Standard: 8 self-drilling roofing screws per mΒ² with neoprene washers. Place at every other corrugation crest on each purlin.

πŸ”Ί Ridge Cap & Accessories

Ridge caps: standard 2.44m with 10cm overlap. Also consider gutter flashing, wall flashing, and foam sealer strips.

πŸ“Š Corrugated Roofing Sheet Reference

Sheet Type Length Coverage/sheet Best Use
Zinc Corrugated2.44-6m~0.85mΒ²/mEconomy roofing, sheds
Pre-painted Galvanized2.44-12m~0.85mΒ²/mResidential, commercial
Standing SeamCustom~0.45mΒ²/mPremium, architectural
Tile Effect Metal2.20-3.6m~1.0mΒ²/mAesthetic, traditional look

❓ Frequently Asked Questions about Tile Calculation

How do I calculate calamine sheets for my roof?

Measure roof width and length. Divide by effective sheet coverage (accounting for overlaps). Add 5-10% waste.

What is the standard overlap for corrugated roofing?

Lateral overlap: 1.5 corrugations (about 15cm). Longitudinal overlap: 15-20cm depending on roof slope.

How many screws per calamine sheet?

Use approximately 8 self-drilling screws per mΒ². For a standard 3.6m Γ— 1.1m sheet, that is about 25-30 screws.