Tile & Slate Roof Calculator
Calculate clay, concrete, and slate tile quantities. Tiles per sq ft, weight estimate, underlayment, and fasteners.
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Tile/Slate Calculation
Tiles = Area × Tiles per sq ft × (1 + Waste%)
Varies by tile size
Weight: Slate 800-1200 lbs/sq, Clay 600-900, Concrete 400-600
Per 100 sq ft
Underlayment: 432 sq ft per roll (15# felt)
With 10% overlap
Tile coverage varies by size and head lap. Natural slate is heaviest. Synthetic slate is 50-75% lighter. Always verify with manufacturer for exact coverage.
Reference: Tile manufacturer specs, NRCA
Frequently Asked Questions
Large format: ~8/sq ft. Standard: ~10/sq ft. Small/clay: ~20/sq ft. Head lap and tile dimensions affect coverage.
Natural slate: 800-1,200 lbs per square (100 sq ft). Synthetic slate is 50-75% lighter. Verify structure can support the weight.