Roof Underlayment Installation Checklist
Roof Underlayment Installation Checklist
Quick Summary
A roof underlayment checklist helps crews make sure the roof deck is properly prepared and protected before shingles, metal, or tile go on. It helps prevent leaks, missed seams, and weak points in the roofing system. This checklist is used by roofing installers, foremen, and quality control crews during reroofing and new construction.
When to Use This Checklist
- After roof tear-off and deck inspection is complete.
- Before installing shingles, metal, or tile roofing.
- During new roof construction projects.
- After deck repairs or sheathing replacement.
- During quality control inspections before roofing continues.
- After weather exposure to confirm deck protection is intact.
Before You Start
- Verify roof deck is clean, dry, and structurally sound.
- Confirm all deck repairs are completed and approved.
- Check weather conditions (avoid rain or high wind installation).
- Verify correct underlayment type and roll quantities.
- Confirm drip edge, flashing, and valley details are ready.
- Review roof layout and installation pattern.
- Ensure crew has proper PPE and fall protection.
- Stage materials for efficient roof access.
Safety Checks
- Inspect ladders and roof access points before use.
- Verify fall protection is installed and worn correctly.
- Ensure roof surface is free of loose debris or nails.
- Confirm safe handling of rolled materials on the roof.
- Monitor weather conditions throughout installation.
- Keep work areas clear to prevent slips and trips.
- Secure tools and materials to prevent sliding.
Tools, Equipment, and Materials
- Roof underlayment rolls (synthetic, felt, or peel-and-stick).
- Roofing nails, cap nails, or staples as required.
- Utility knives and cutting tools.
- Measuring tape and chalk line.
- Hand rollers for sealing (for peel-and-stick systems).
- Roofing hammer or nail gun.
- Inspection checklist and layout drawings.
Roof Underlayment Checklist
- Verify roof deck is fully inspected and approved for underlayment.
- Confirm all debris, nails, and sharp materials are removed.
- Install drip edge at eaves before underlayment where required.
- Start underlayment installation at correct roof edge per layout.
- Ensure proper horizontal or vertical alignment based on system type.
- Maintain correct overlap between rows (per manufacturer spec).
- Secure underlayment with proper fastener spacing.
- Install underlayment smoothly without wrinkles or air pockets.
- Seal valleys, hips, and high-risk leak areas carefully.
- Properly wrap or integrate around roof penetrations.
- Overlap ridge and edge details as required.
- Inspect for exposed deck areas and cover immediately.
- Verify underlayment is secure before leaving sections unattended.
- Complete a full visual inspection of installed areas.
- Document any repairs or rework needed before roofing continues.
Documentation Needed
- Underlayment installation photos.
- Material batch numbers and product details.
- Inspection and quality control records.
- Notes on overlaps, repairs, or installation issues.
- Weather conditions during installation.
- Crew sign-off or supervisor approval.
Common Mistakes to Avoid
- Installing underlayment on a dirty or wet roof deck.
- Incorrect overlap between rolls or rows.
- Missing valley or penetration sealing details.
- Overdriving or under-spacing fasteners.
- Leaving exposed deck areas overnight.
- Not following manufacturer installation instructions.
End-of-Day / Final Review
- Underlayment installation is complete for designated roof areas.
- All seams, overlaps, and penetrations have been inspected.
- Loose materials and debris have been removed from the roof.
- Any exposed areas have been properly covered or secured.
- Photos and documentation have been completed.
- The roof is ready for shingle, metal, or tile installation.
Checklist Completion
Project / Job Name
Jobsite / Location
Completed By
Role / Title
Completed Date
Completed Time
Signature
Reviewed / Approved By, if needed
Notes / Follow-Up Items
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