Roofing Estimating Guide: Material Takeoff and Costing for Commercial Roofing

Roofing is a critical building envelope trade where material selection, local climate, and detailing complexity directly affect both material quantities and labor productivity.

Roofing System Types

Low-Slope Roofing (Commercial)

System	Typical Lifespan	Cost/SF (Installed)
TPO membrane	15-25 years	$8-$14
PVC membrane	20-30 years	$10-$16
EPDM rubber	20-25 years	$7-$12
Modified bitumen	15-20 years	$9-$15
Built-up (BUR)	20-30 years	$10-$18

Steep-Slope Roofing

• Asphalt shingles — $4-$8/SF
• Metal standing seam — $12-$25/SF
• Clay/concrete tile — $15-$30/SF
• Slate — $20-$40/SF

Material Takeoff Quantities

Membrane Area

• Net roof area (length × width)
• Add 10-15% for laps, flashings, waste
• Separate field membrane from flashing membrane

Insulation

• Thickness based on code-required R-value
• Cover board over insulation for mechanical attachment
• Tapered insulation for positive drainage

Flashings and Accessories

• Perimeter flashing (edge metal, gravel stop)
• Penetration flashings (curbs, vents, drains, skylights)
• Copings, gutters, downspouts
• Walkway pads, equipment curbs

Labor Productivity

Task	Productivity (SF/hr)
TPO mechanically attached	200-300 SF/hr
TPO fully adhered	100-150 SF/hr
Insulation installation	150-200 SF/hr
Metal flashing	20-30 LF/hr

Climate Considerations

• Northern climates: Ice dam protection, snow guards, heavier insulation
• Southern climates: UV resistance, cool roof coatings, high-heat adhesives
• Hurricane zones: Wind uplift ratings (FM 1-90, 1-60), heavier fastening patterns

For professional commercial roofing takeoffs, contact F&K Estimatings. Our estimators are experienced with all major roofing systems and manufacturer specifications.