Jurisdiction-specific code packets, storm reports, and compliance documents — generated in 60 seconds from any US ZIP code.

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Hail Map
Storm Archive
Storm Alerts
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Jurisdiction-specific code packets, storm reports, and compliance documents — generated in 60 seconds from any US ZIP code.

Generate

Storm Reports
Code Packet
Photo Packet
Material Calculators
Upload Documents
Measurement Import

Storm Data

Hail Map
Storm Archive
Storm Alerts
Wind History

Reference

Code Search
Citation Pack
Check Permits
Building Departments
States Directory
Compare States
Building Codes

Company

About
Why cite.codes
Privacy Policy
Terms of Service
Contact
Help Center
Brand Guidelines

All Calculators

Underlayment Calculator

Calculate synthetic or felt underlayment rolls for full roof deck coverage

Roof Area

Enter total roof surface area

Total Roof Area

After slope factor if using measurement PDF

Waste Factor15%

SimpleNormalComplex

Underlayment Type

Synthetic Specifications

Roll Width4'

Roll Length250'

Coverage/Roll1000 SF

Overlap4"

Code Reference

Coverage Visualization

Enter roof area to calculate underlayment requirements

PDF includes: calculation inputs, material quantities, applicable code references, and computation trace