Most commercial roofing bids in the Livonia area look similar on paper. Same membrane type, similar square footage, comparable timelines. What those bids often do not tell you is whether you are getting the same installation quality, the same material specification, or the same warranty protection. Understanding how to compare TPO roofing proposals in Livonia, MI, goes beyond the bottom line number, and getting it wrong means paying twice when the first installation underperforms.
At Core Values Construction, we install TPO roofing systems across Livonia and southeast Michigan and we are glad to walk you through exactly what our proposals include. Call us at 517-260-3957 to get a proposal worth comparing.
This article covers what Livonia commercial building owners should look for when comparing TPO roofing bids, what the most common substitutions and omissions look like in practice, and what a properly specified TPO proposal actually contains.
Comparing TPO Roofing Bids
The most common mistake in comparing TPO roofing bids is treating them as equivalent when they describe the work in general terms rather than specific ones. A bid that says, “install new TPO roofing system” and a bid that says “install 60-mil mechanically fastened Carlisle TPO over new polyisocyanurate insulation to R-25 with full flashing scope at all penetrations and parapet walls” are not comparable documents. The first gives the contractor discretion over every material and method decision after the contract is signed. The second holds them to a defined standard. Livonia building owners who compare those two bids on price alone are not comparing the same product. They are comparing a fixed delivery to an open-ended one, and the gap between what they think they are buying and what actually gets installed only becomes clear once the crew is on the roof.
Material Substitutions
When a TPO roofing proposal does not name the membrane manufacturer and thickness, the contractor retains the ability to substitute after the contract is executed.
A 45-mil membrane costs less than a 60-mil membrane. A generic TPO product costs less than a Carlisle or Versico system with manufacturer warranty backing. An insulation board at R-20 costs less than one at R-25. None of those substitutions are visible from the ground once the job is done, and none of them violate a contract that did not specify otherwise.
On a Michigan commercial roof that needs to perform through decades of lake-effect winters, UV summers, and the freeze-thaw cycling that comes with the Detroit area’s seasonal range, those specification differences show up in longevity, and the building owner absorbs the cost of a roof that needed attention sooner than it should have.
What a Complete TPO Roofing Proposal Should Specify
Before signing any TPO roofing contract in Livonia, confirm that the proposal document specifies each of the following:
- Membrane manufacturer, product name, and mil thickness. “60-mil Carlisle Sure-Weld TPO” is a specification, “TPO membrane” is not.
- Insulation type, thickness, and R-value being installed, and whether wet insulation will be identified through core cuts and replaced before new material goes down.
- Attachment method, whether mechanically fastened, fully adhered, or ballasted, and the wind uplift standard the assembly is designed to meet.
- Warranty terms in writing before the project starts, naming coverage period, whether labor is included, and the tier of manufacturer warranty the installation qualifies for.
Warranty Tier Matters
TPO manufacturers offer multiple warranty tiers, and the tier available depends on the contractor’s certification level and whether the installation meets the application standards required for that coverage. A 10-year material-only warranty and a 20-year no-dollar-limit labor and materials warranty are both described as “manufacturer warranty” in a proposal, but they represent completely different levels of protection. The higher tiers require trained and certified installers. A contractor who cannot name the warranty tier they are offering, or who cannot explain why their certification level qualifies them for it, is either not certified for the higher tiers or is offering coverage they cannot actually deliver. Either way, that conversation belongs before the contract is signed.
Get a TPO Roofing Proposal
Livonia commercial building owners deserve TPO roofing proposals that specify every material, every method, and every warranty term before a dollar is committed. At Core Values Construction, every proposal we submit names the membrane, details the scope, and puts the warranty terms in writing from the start. Call us at 517-260-3957 and let us show you what a complete TPO roofing proposal looks like.
FAQ
How many bids should I get for a commercial TPO roofing project in Livonia?
Three bids is the standard benchmark, giving enough comparison data to identify outliers in both price and scope detail without dragging out the process.
What TPO membrane thickness is most common on Michigan commercial buildings?
60-mil is the most widely specified thickness for Michigan commercial flat roofs, offering a practical balance of puncture resistance and durability for buildings with regular rooftop service traffic.
Can a TPO roofing warranty transfer to a new owner if the Livonia building is sold?
Many manufacturer warranties are transferable, but transfer terms and any associated fees should be confirmed in the original warranty documentation at the time of installation.
Does TPO roofing qualify for energy efficiency tax deductions on Michigan commercial buildings?
Energy Star rated TPO systems may support eligibility for commercial energy efficiency tax incentives, and a tax professional should be consulted to confirm applicability for a specific property.