Project Overview
This scope covers commercial roofing including membrane installation, flashing, penetration details, edge metal, and warranty. Applicable to flat, low-slope, and steep-slope commercial projects.
Typical Projects Include:
- TPO or PVC membrane installation
- EPDM rubber roof
- Built-up roofing (BUR)
- Modified bitumen roof
- Standing seam metal roof
- Commercial roof repair or coating
Scope of Work
Prep & Tear-Off
| Task | Description |
|---|---|
| Roof Survey | Survey the existing roof — document conditions, drains, curbs, penetrations, and problem areas. |
| Tear-Off | Remove existing roofing membrane and insulation down to the deck (or overlay if specified). |
| Deck Repair | Inspect and repair the roof deck. Replace damaged sections of metal, concrete, or wood deck. |
| Staging | Set up material staging, crane access, and safety perimeters. |
Installation
| Task | Description |
|---|---|
| Insulation | Install roof insulation and tapered insulation system for proper drainage to roof drains. |
| Membrane | Install roofing membrane (TPO, PVC, EPDM, or modified bitumen) per manufacturer specifications. |
| Flashing & Details | Flash all curbs, penetrations, drains, scuppers, and wall transitions with compatible materials. |
| Edge Metal | Install edge metal, coping, and gravel stops at all roof perimeters. |
Closeout
| Task | Description |
|---|---|
| Quality Inspection | Inspect all seams, flashing, and details. Test welds and seams per manufacturer requirements. |
| Drainage Test | Verify positive drainage to all roof drains. No ponding water after 48 hours. |
| Cleanup | Remove all debris, staging, and equipment. Clean drains and gutters. |
| Warranty | Schedule manufacturer inspection (if required for NDL warranty). Submit warranty application. |
Timeline & Milestones
Commercial roofing timelines depend on building size. Most projects take 1-4 weeks.
| Phase | Duration | Description |
|---|---|---|
| Prep & Tear-Off | 2-5 days | Tear-off, deck repair, and staging. |
| Installation | 5-15 days | Insulation, membrane, flashing, and edge metal. |
| Closeout | 2-3 days | Inspection, testing, cleanup, and warranty. |
Roles & Responsibilities
Building Owner / Property Manager
- •Provide roof access and building information
- •Coordinate with building occupants about noise and disruption
- •Approve the roofing system and warranty level
- •Process payments per the agreed schedule
Commercial Roofing Contractor
- •Survey the existing roof and develop a scope
- •Pull permits and coordinate inspections
- •Install the roofing system per manufacturer specifications
- •Obtain manufacturer warranty on behalf of the owner
- •Provide maintenance recommendations
Materials & Equipment
Membrane
- •TPO, PVC, EPDM, or modified bitumen membrane
- •Membrane adhesive or fasteners
- •Seam tape or welding equipment
- •Flashing membrane
Insulation
- •Polyiso insulation boards
- •Tapered insulation for drainage
- •Cover board
- •Insulation fasteners
Accessories
- •Edge metal and coping
- •Roof drains and scuppers
- •Pipe boots and curb flashing
- •Walkway pads
Quality Control Standards
Seam Integrity
All membrane seams fully welded or adhered per manufacturer specifications. No open seams.
Positive Drainage
Roof drains properly with no ponding water 48 hours after rain.
Manufacturer Compliance
Installation meets manufacturer requirements for NDL (No Dollar Limit) warranty eligibility.
Safety Protocols
Fall Protection
Perimeter warning lines, guardrails, or personal fall arrest systems required on all commercial roofs.
Hot Work
Follow hot work permit procedures when using torches for modified bitumen or hot asphalt.
Weather Monitoring
Monitor weather conditions. Secure open roof areas before storms. No membrane installation in wet conditions.
Project Documentation
- Signed contract and scope of work
- Roof survey and core sample results
- System specification and shop drawings
- Daily progress reports
- Seam test results
- Manufacturer warranty certificate
Financial Terms
Payment Structure
Commercial roofing projects use milestone payments tied to project progress.
Terms & Conditions
- •Deposit due at contract signing (typically 20-30%)
- •Payment at 50% completion
- •Payment at substantial completion
- •Retainage held until warranty is issued (typically 5-10%)
- •Change orders for deck repair and unforeseen conditions
Acceptance Criteria & Sign-Off
The project is considered complete when the following criteria are met:
- 1Membrane installed per manufacturer specifications
- 2All seams tested and verified
- 3Flashing complete at all penetrations and transitions
- 4Positive drainage confirmed
- 5Edge metal and coping installed
- 6Manufacturer warranty issued
Frequently Asked Questions
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