Flat Roof TPO Replacement Proposal Template
Standard scope for residential flat roofs, commercial low-slope buildings, and modern architectural additions using single-ply TPO membrane.
Complete Scope of Work
Copy or customize these verbatim specifications into your contractor proposal.
1. Tear-Off & Core Sampling
Removal of failing built-up or modified bitumen roof.
- Perform core cut test to determine insulation thickness and substrate condition.
- Tear off existing gravel, tar, or modified bitumen layers down to structural deck.
- Inspect metal or wood deck for moisture, rust, or deterioration.
2. Polyisocyanurate Insulation & Taper System
Thermal insulation and positive drainage cricket slope.
- Fasten 2-inch closed-cell polyisocyanurate (polyiso) insulation boards with heavy-duty plates and screws.
- Install tapered insulation crickets between scuppers to eliminate ponding water.
- Install 1/2-inch high-density cover board for puncture and hail protection.
3. TPO Membrane & Robotic Heat-Welded Seams
Single-ply membrane installation.
- Install 60-mil white reflective TPO membrane (mechanically fastened or fully adhered).
- Hot-air weld all lap seams using robotic welder (minimum 1.5-inch continuous weld width).
- Test all seams with cotter pin probe tool to verify 100% monolithic seal.
4. Edge Metal, Scuppers & Penetrations
Perimeter termination and drainage components.
- Install TPO-clad parapet wall drip edge and termination bar with polyurethane sealant.
- Fabricate and heat-weld prefabricated TPO pipe boots, corner wraps, and scupper boxes.
- 20-Year manufacturer material warranty and 5-year contractor workmanship warranty.
Standard Line-Item Material Allowances
Clear material specifications that protect against ambiguous scope arguments.
| Component / Assembly | Standard Specification | Unit / Allowance |
|---|---|---|
| 60-Mil White TPO Membrane | Energy Star rated heat-reflective single-ply | Per Square |
| Polyiso Insulation (R-12+) | 2-Inch 20 PSI rigid polyisocyanurate boards | Per Board |
| High-Density Cover Board | 1/2-Inch primed gypsum or polyiso cover board | Per Board |
| TPO-Clad Drip Edge Metal | 24-Gauge Galvalume with factory-laminated TPO | Linear Feet |
| Prefabricated TPO Pipe Boots | Injection molded heat-weldable boots | Per Unit |
Scope-Gap Protections: 3 Clauses to Include
These contractual gotchas account for 85% of change-order arguments on flat roof tpo replacement proposal templates.
The Risk: Water ponding longer than 48 hours voids many single-ply manufacturer warranties.
Protective Clause: Specifies tapered polyiso crickets to direct water toward scuppers or internal drains.
The Risk: Corroded corrugated steel decking cannot hold insulation fasteners.
Protective Clause: States scope includes inspection; rusted deck panels requiring replacement will be billed at $X per square foot.
The Risk: Water entering porous masonry coping stones above the roof line creates leaks blamed on the new roof.
Protective Clause: Clearly marks termination height and specifies metal coping cap upgrades as an optional addendum.
Governing Building Codes & Standards
Frequently Asked Questions
Why is 60-mil TPO recommended over 45-mil for low-slope roofs?▾
60-mil TPO provides a 33% thicker weathering layer, superior puncture resistance against foot traffic and tree debris, and qualifies for extended 20-year manufacturer warranties.
Does a white TPO roof lower cooling energy costs?▾
Yes. Highly reflective white TPO has a Solar Reflectance Index (SRI) over 100, reflecting up to 80% of the sun's rays and significantly reducing attic and cooling loads.
Related Roofing Proposal Scopes
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