How to Read a Roof-Coating Specification

The Specification Is Only One Part of the Contract Documents

Roofing requirements may be distributed through bidding instructions, agreement forms, general and supplementary conditions, Division 01 requirements, Division 07 technical sections, drawings, roof plans, details, schedules, addenda, substitutions, manufacturer documents, field reports, and written clarifications.

The Three-Part Technical Section

Start with Scope Boundaries

Before studying product properties, mark what is included, excluded, existing, removed, repaired, furnished by others, and coordinated with another trade. Roof-coating scopes commonly fail at interfaces.

• Who performs moisture surveys and exploratory openings?
• Who removes and replaces wet insulation, cover board, membrane, or deck?
• Who corrects drainage, raises curbs, or modifies rooftop equipment?
• Who removes and reinstalls solar equipment, conduit, piping, screens, or walkways?
• Who repairs masonry, counterflashing, coping, sheet metal, gutters, drains, and sealant joints?
• Who provides power, water, access, crane service, disposal, and protection?
• Who owns weather delays, interior protection, shutdowns, odor control, and overspray claims?
• Who obtains permits, inspections, tested-assembly documentation, and warranty approval?

Translate Product Names into System Functions

A named product is not enough. Determine why each material exists and where it must be used.

Read Physical-Property Tables Carefully

Specifications often list elongation, tensile strength, tear resistance, permeance, water absorption, low-temperature flexibility, adhesion, reflectance, emittance, accelerated weathering, and other properties.

Record the test method, specimen preparation, film thickness, conditioning, units, direction, temperature, aging condition, and required result.

Two values are not necessarily comparable when they were produced using different test methods or conditions. A property measured on a free film does not directly establish performance on every roof substrate. A test report also does not prove that the installed project matches the tested assembly.

Reference Standards: “Comply With” Means More Than Listing a Number

When a specification cites a standard, determine:

• The complete designation, title, and required edition
• Whether it is a material specification, test method, application guide, design standard, or classification
• Which party performs the test and who pays for it
• Required sample locations, frequency, conditioning, equipment, and reporting
• The numerical or qualitative acceptance criterion
• The required response to a failed result

For example, ASTM D4414 addresses field measurement of wet-film thickness by notch gages. Citing the method without stating target thickness, locations, frequency, timing, and corrective action leaves the field-control requirement incomplete.

Submittals Are Commitments

A submittal is not a pile of product sheets. It should demonstrate that the proposed system satisfies the project requirements. A complete package may include:

• System identification and substrate-specific guide specification
• Product data and safety data for every component
• Manufacturer details adapted to actual project conditions
• Application rates, calculated quantities, WFT, DFT, and coat sequence
• Compatibility statements and adhesion-test procedures
• Fire, wind, code, evaluation, and cool-roof documentation where required
• Installer qualifications and manufacturer authorization
• Sample warranty and explanation of inspections, fees, exclusions, and maintenance
• Color, aggregate, walkway, and finish samples
• Quality-control forms, environmental logs, and closeout plan

Approval of a submittal does not normally relieve the contractor from complying with the contract documents. Read the project procedures and do not treat an approved product sheet as permission to disregard a conflicting requirement.

Substitutions and “Or Equal” Systems

A substitute should be compared as a complete system—not by matching the finish-coat chemistry.

The comparison should address every primer, repair material, reinforcement, coat, thickness, detail, substrate approval, test result, listing, warranty, installer qualification, and maintenance requirement.

Environmental and Scheduling Requirements

Turn every limitation into a schedule control. Identify minimum and maximum air and substrate temperatures, dew-point separation, relative-humidity limits, wind limits, forecast restrictions, rain-free cure time, overnight conditions, freeze protection, daily cutoff time, recoat windows, and maximum exposure between coats.

Also identify occupied-building restrictions: air-intake shutdowns, odor or VOC controls, noise, access, overspray protection, vehicle relocation, interior protection, fire watches, hot-work rules, and emergency dry-in. These conditions affect production and should be priced.

Warranty Language Must Be Read Separately

Do not price from the warranty term alone. Determine:

• Who issues the warranty and whether the contractor also provides one
• Material-only, labor-and-material, system, workmanship, or leak coverage
• Approved-applicator and manufacturer-inspection requirements
• Minimum system build and whether it differs from the base specification
• Wind-speed limits, exclusions, deductibles, monetary caps, and consequential-damage exclusions
• Drainage, ponding, maintenance, inspection, repair, reporting, and transfer requirements
• Whether penetrations or work by others can void or restrict coverage

If the specification promises a warranty that the selected manufacturer will not issue for the proposed assembly, resolve the conflict before bidding.

Questions That Belong in an RFI

• The specification and detail require different reinforcement or film build.
• The named system is not approved for the identified substrate.
• Coverage rate, WFT, DFT, and volume solids do not reasonably correspond.
• The required warranty demands a different system construction.
• Moisture limits, adhesion acceptance, test frequency, or repair extent are not stated.
• The documents do not assign responsibility for drainage correction, wet-roof removal, sheet metal, penetrations, or equipment work.
• A referenced standard is obsolete, incomplete, or unrelated to the specified use.
• The required code, fire, wind, or energy documentation is not available for the proposed assembly.

A good RFI identifies the exact document location, states the conflict or missing information without argument, explains the effect on price or performance, and requests a written decision.