Direct Answer
A consultant’s role in writing a commercial re-roof specification and RFP is to translate the building’s existing roof conditions, project objectives, performance requirements, and applicable standards into clear bidding documents that allow qualified roofing contractors to submit comparable proposals.
For a commercial re-roof, the consultant typically develops the roofing-related drawings, technical specifications, bidding requirements, alternates, unit prices, submittal requirements, and quality-assurance provisions. IIBEC’s current description of Registered Roof Consultant work specifically includes preparation of contract documents such as bidding documents, general conditions, technical specifications, roof plans, sections, and details related to roofing. :contentReference[oaicite:0]{index=0}
Who This Applies To
- Commercial property owners and asset managers
- Developers and owner’s representatives
- Facility and property management teams
- General contractors managing re-roofing work
- Commercial real estate investors preparing capital projects
- Organizations soliciting competitive roofing bids
Not for: A consultant’s specification and RFP should not be treated as a substitute for the contractor’s means-and-methods, field measurements, safety program, or responsibility to install the roof in accordance with the contract documents and applicable requirements.
1. The consultant starts with the existing roof—not a generic specification
Before writing the RFP, the consultant should understand what is actually on the building. Depending on the project, this can involve reviewing existing drawings and records, performing a roof condition assessment, identifying roof assemblies and substrates, documenting penetrations and rooftop equipment, and investigating drainage, flashing, moisture, and other existing conditions.
IIBEC identifies roof condition surveys and investigations as a distinct professional service involving observation, identification, and documentation of roof conditions. The resulting information can then inform the contract-document phase. :contentReference[oaicite:1]{index=1}
This prevents the RFP from describing a theoretical roof that does not match the building.
2. The consultant defines the scope of the re-roof
The specification should make clear what the contractor is actually being asked to accomplish. Depending on the project, the scope may address:
- Removal or recovery of existing roofing
- Existing insulation and replacement insulation
- Deck conditions and repairs
- New membrane or other roof system
- Flashings and perimeter conditions
- Curbs, penetrations, drains and scuppers
- Roof-to-wall transitions
- Edge metal and perimeter securement
- Expansion joints
- Equipment supports and rooftop accessories
- Temporary protection and weatherproofing
- Testing and quality assurance
- Warranty requirements
- Closeout documentation
The consultant’s objective is to establish a sufficiently complete scope so contractors are pricing substantially the same work rather than making different assumptions about what is included.
3. The consultant develops project-specific specifications
A good re-roof specification is more than a manufacturer’s product brochure. It establishes the technical requirements that govern the project while allowing appropriate competitive alternatives where the owner’s procurement strategy permits them.
IIBEC notes that consultants develop plans and specifications for roofing systems and that project-specific factors can influence the appropriate system selection. These factors can include the building’s location, occupancy, access limitations, maintenance requirements, unusual roof uses, applicable requirements, and manufacturer warranty conditions. :contentReference[oaicite:2]{index=2}
The specification can establish requirements for materials, attachment, insulation, membrane installation, flashing, detailing, testing, submittals, warranties, and quality assurance.
4. The consultant makes the RFP measurable
The RFP should give bidders enough information to price the work consistently. Depending on the project, this may include:
| RFP Element | Purpose |
|---|---|
| Base bid | Defines the primary re-roof scope that every bidder must price. |
| Alternates | Allows the owner to compare defined scope changes separately. |
| Unit prices | Provides pricing for uncertain quantities such as deck replacement or additional insulation. |
| Allowances | Addresses specifically identified work where the final quantity or selection is not yet known. |
| Existing-condition requirements | Clarifies what bidders must investigate or verify before submitting a proposal. |
| Submittal requirements | Defines the technical information contractors must provide for review. |
| Warranty requirements | Defines the required manufacturer and contractor warranty deliverables. |
IIBEC, IIBEC and NRCA’s current Roofing Project Submittal and Protocol Guidelines specifically address project submittals and protocols through design, prebid, bidding, preconstruction, construction and closeout. Their specifier checklist includes bid documents, notifications, proposal forms, addenda, existing-condition summaries, project-specific conditions and unit prices. :contentReference[oaicite:3]{index=3}
5. The consultant establishes contractor qualification requirements
The consultant can help the owner define what information prospective bidders must provide. Depending on the project, this may include relevant project experience, manufacturer authorization, licensing, insurance, references, safety information, proposed supervision, crew qualifications, warranty eligibility and similar qualifications.
The purpose is not simply to obtain the lowest number. The RFP should create a consistent basis for evaluating whether bidders can perform the specified work.
IIBEC describes the consultant’s role as including owner representation and assistance through the prebid process, while its roofing-project guidance separates responsibilities among the owner, specifier and contractor. :contentReference[oaicite:4]{index=4}
6. The consultant manages questions and addenda during bidding
Once the RFP is issued, contractors may identify ambiguities, conflicts, missing information or existing conditions that require clarification.
The consultant may review roofing-related questions, issue clarifications, prepare addenda, and make appropriate revisions so all bidders receive the same information. IIBEC documentation describes this as part of the consultant’s bidding-phase responsibilities. :contentReference[oaicite:5]{index=5}
This is particularly important when a clarification changes scope, material requirements, quantities, sequencing or pricing assumptions.
7. The consultant helps establish a fair basis for bid comparison
After proposals are received, the consultant may prepare or assist with bid tabulation and identify differences between proposals. The comparison should distinguish between:
- Base-bid differences
- Excluded work
- Alternates
- Unit prices
- Allowances
- Proposed substitutions
- Warranty differences
- Exceptions to the specification
- Qualifications or qualifications attached to the proposal
This helps the owner understand whether a lower apparent bid is actually comparable to the other proposals.
8. The consultant should avoid creating an unnecessarily restrictive specification
A well-developed specification should be specific about required performance and project conditions without unnecessarily restricting competition.
IIBEC has described the consultant’s specification role as taking project-specific requirements into account while allowing fair competition among appropriate manufacturers and systems. :contentReference[oaicite:6]{index=6}
Where proprietary products or systems are required, the procurement documents should clearly establish the basis and applicable requirements rather than leaving contractors to guess what will be accepted.
9. The consultant coordinates the RFP with the construction phase
The specification should not be written in isolation from what happens after award. Requirements for submittals, shop drawings, samples, mock-ups, testing, observations, meetings, inspections, warranty inspections and closeout should be established in the documents when those services are part of the project.
The current CRCA/IIBEC/NRCA guidelines specifically recognize a continuing sequence from design and prebid through bidding, preconstruction, construction and closeout. :contentReference[oaicite:7]{index=7}
10. What the consultant does not replace
The consultant does not normally take over the roofing contractor’s responsibility for construction means and methods, crew management, site safety, sequencing of its own work, or workmanship.
The consultant’s contractual role should clearly state whether the consultant is providing design, bidding assistance, construction administration, periodic observation, full-time quality assurance, warranty assistance, or some combination of these services.
IIBEC’s professional guidance distinguishes the contractor’s construction responsibilities from the consultant’s quality-assurance and observation responsibilities, with the exact scope governed by the professional services agreement and project documents. :contentReference[oaicite:8]{index=8}
11. A practical consultant-to-RFP workflow
| Phase | Consultant’s Typical Role |
|---|---|
| Existing conditions | Investigate and document the existing roof. |
| Design | Develop roof system approach, details, drawings and specifications. |
| RFP preparation | Define scope, bidder requirements, pricing structure, alternates and unit prices. |
| Prebid | Answer roofing questions and clarify project requirements. |
| Bidding | Review proposals and assist with bid comparison. |
| Award | Assist the owner in evaluating qualifications, exceptions and substitutions. |
| Preconstruction | Review required submittals and participate in preconstruction coordination. |
| Construction | Perform the observation or quality-assurance services included in the contract. |
| Closeout | Review required closeout documentation and assist with final roof acceptance. |
Bottom Line
The consultant’s role is to turn an existing commercial roof and the owner’s objectives into a clear, project-specific, technically defensible set of bidding and contract requirements. The specification defines what must be built and how performance will be evaluated; the RFP establishes how qualified contractors will price and propose that work.
A strong consultant-led process therefore connects existing-condition investigation → design → specifications → RFP → bid clarification → proposal comparison → construction requirements → quality assurance → closeout. IIBEC’s current consultant guidance and the CRCA/IIBEC/NRCA roofing submittal guidelines both recognize this broader project lifecycle rather than treating the specification as an isolated document. :contentReference[oaicite:9]{index=9}
Related Questions
- What makes a commercial roof replacement specification buildable?
- How should owners evaluate competing commercial roofing proposals?
- What roofing submittals should a GC expect from a commercial roofing subcontractor?
- What should a GC look for in a commercial roofing subcontractor bid?
- What does an RRO look for during commercial roof installation?
Sources
- IIBEC – Registered Roof Consultant application and study guide: https://iibec.org/wp-content/uploads/2024-IIBEC-RRC-Application-and-Study-Guide-2020.pdf
- IIBEC – Consultant services and capabilities: https://consultant.iibec.org/
- IIBEC/CRCA/NRCA – Roofing Project Submittal and Protocol Guidelines: https://iibec.org/project-guidelines/
- NRCA – Roofing Project Submittal and Protocol Guidelines: https://www.nrca.net/RoofingNews/crca-iibec-and-nrca-release-guidelines-for-specifying-roofing-project-submittals.10-25-2023.11746/details/story
- IIBEC – Standard of Care: What Is Your Risk?: https://iibec.org/standard-of-care/
Last reviewed
September 29, 2026
Related Resources
- Commercial Roof Due Diligence Inspection
- What Is an IIBEC Registered Roof Observer (RRO)?
- How Should Owners Evaluate Competing Commercial Roofing Proposals?
- What Should a Commercial Roof Observation Report Include?
Need Commercial Roofing Help?
ShieldLine Roofing can help commercial property owners evaluate existing roof conditions, plan re-roofing work, develop appropriate project requirements, and coordinate commercial roofing services.
Disclaimer: This information is for general educational purposes and does not replace project-specific advice from a qualified roofing consultant, architect, engineer, attorney, manufacturer, or other applicable professional. Contractual responsibilities and regulatory requirements vary by project and jurisdiction.
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