Bid packages, warranty structures, roof asset management and phased capital planning - written for whoever actually has to defend the number.
Reviewed by Michael ThompsonCommercial roofing covers the low-slope membrane and metal systems on industrial, retail, institutional and multi-tenant buildings, and it differs from residential work less in materials than in how it is procured and managed. The unit of decision is a roof with a documented remaining service life, a warranty with named obligations, and a place in a capital plan - not a one-off purchase made when the ceiling tiles start staining.
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Condition survey and remaining service life
An independent survey establishes membrane condition, seam and flashing integrity, drainage performance, and - critically - whether the insulation is wet, via core samples or infrared. The deliverable is a documented remaining service life you can put in a plan.
Watch forA survey performed by the contractor bidding the replacement. For a decision at this value, the assessment and the work should be separately procured, or the assessment should be explicitly acknowledged as a bid document.
Repair, restore or replace - decided on numbers
Three genuinely different capital paths: targeted repair to extend life, restoration or a coating system over a sound membrane, or full tear-off and replacement. The choice turns on how much of the assembly is wet, how much life the substrate has, and where the building sits in your hold period.
Watch forRestoration sold as equivalent to replacement. Coating a sound membrane can genuinely extend service life and defer capital; coating over wet insulation defers nothing and hides an accelerating problem until it is much more expensive.
Writing a bid package that produces comparable numbers
Specify the system by manufacturer and thickness, the attachment method, insulation type and R-value, cover board, tapered design, edge metal standard, warranty type and term, and the site constraints - access, hours, staging, occupied operations. Then every bid is answering the same question.
Watch forInviting bids on "replace the roof". You will receive three prices for three different roofs, and the lowest will be the thinnest specification. The bid package is where the money is saved, not the negotiation.
Contractor qualification
Manufacturer approval status for the specified system, safety record, bonding capacity, current financial standing, references on comparable buildings, and evidence of self-performed rather than wholly subcontracted crews.
Watch forManufacturer certification assumed rather than verified. System warranties are usually only available through approved applicators for that specific system, and approval is checkable directly with the manufacturer in a phone call.
Phasing, and working over an occupied building
Large roofs are frequently phased by section across budget years or around operational constraints. Work over occupied space needs sequencing, odour and noise management, protection of interiors, and a plan for weather exposure at each day's tie-off.
Watch forNo daily tie-off detail in the programme. On a phased or weather-interrupted job, how each day's work is made watertight before the crew leaves is the difference between a roofing project and an internal flood.
Warranty - read what it actually obligates
Manufacturer system warranties range from material-only to full no-dollar-limit cover including labour. Terms carry exclusions, maintenance obligations, notification requirements and inspection intervals. The contractor's own workmanship warranty sits alongside and covers a different failure.
Watch forA long warranty term treated as a quality claim. Term length and coverage scope are different things - a lengthy material-only warranty can be worth considerably less than a shorter NDL warranty covering labour and consequential water damage.
Handover into a roof asset management programme
As-built documentation, warranty registration, drain and seam inspection schedule, and a rule that no other trade goes on the roof without notification. Most premature commercial roof failures trace back to somebody else's rooftop work.
Watch forNo control over roof access after handover. Satellite, HVAC and solar contractors puncture membranes routinely, and unauthorised rooftop work is a common ground for a warranty to be declined.
Commercial roofing is priced per square foot and spans a wide range by system, insulation depth, tapered work, access and whether the building stays operational. Restoration is a fraction of replacement where the substrate is dry. Our cost guide covers the assemblies.
See the full commercial roofing cost guide - by material, size and region →
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Everyone else ranking for this is paid when you say yes. Here's when you shouldn't.
| Option | What it means for you |
|---|---|
| TPO | Reflective single-ply with welded seams. The volume commercial system. |
| EPDM | Long field record, flexible in cold, typically dark. |
| PVC | Chemical and grease resistant - restaurants and food processing. |
| Modified bitumen | Multi-ply, durable under rooftop foot traffic. |
| Built-up roofing | The traditional layered assembly still found across older stock. |
| TPO vs EPDM | The specification argument most commercial projects run. |
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Twenty years on and around home improvement work. Reads our guides for the things that are technically true and practically wrong.
Every guide on this site is written by a member of our team and checked by someone else before it publishes, and every figure carries the source and the date we pulled it. Found a number that looks off? Tell us - corrections are the cheapest quality control we have.