WOODHAVEN COMMERCIAL ROOFING REPLACEMENT
Protecht Exteriors
Where Technology and Construction meet
Commercial Roof Replacement in Woodhaven, Michigan
EPDM · TPO · Modified Bitumen · Standing Seam · Corrugated Metal · R-30 Code Compliant · City of Woodhaven Building Department
Protecht Exteriors installs all five major commercial roofing systems in Woodhaven — EPDM, TPO, modified bitumen, standing seam metal, and corrugated metal — and specifies the correct system for each building rather than defaulting to one product regardless of fit. Woodhaven's commercial inventory runs along Allen Road, Van Horn Road, and the I-75 interchange corridors — a mix of strip retail centers, auto service shops, neighborhood commercial, and light industrial from the 1970s through the 1990s. Most of this stock is now 30 to 50 years old, originally roofed with built-up roofing (BUR) or early modified bitumen that is at or approaching end of service life. Michigan adopted ASHRAE 90.1-2022 for commercial energy compliance, establishing a minimum R-30 insulation requirement for low-slope roofs in Climate Zone 5 — Southeast Michigan's designation. Protecht meets this with two staggered layers of polyiso, exceeding the code minimum and future-proofing the building against tightening standards. Permits are pulled on every commercial job. Our office is 10 minutes north of our Flat Rock office.
The R-30 Insulation Requirement for Commercial Roofs in Woodhaven
Climate Zone 5 · ASHRAE 90.1-2022 · Two Staggered Layers Polyiso · Cover Board Required · Applies to Full Replacements
Michigan adopted the 2021 IBC effective January 1, 2024, and references ASHRAE 90.1-2022 as its commercial energy compliance standard. Southeast Michigan — including Woodhaven — falls in Climate Zone 5 under the IECC and ASHRAE classification system. For insulation installed entirely above the roof deck (the standard approach on low-slope commercial roofs), the minimum R-value in Climate Zone 5 is R-30. This is the code floor. A commercial roof replacement in Woodhaven that tears off the existing system down to the structural deck is treated as an alteration under ASHRAE 90.1-2022 Section 5.1.4 and must bring the assembly up to R-30 minimum — regardless of what the original insulation level was.
Polyisocyanurate — polyiso or ISO board — is the dominant above-deck insulation material for commercial roofing in Michigan because it delivers the highest R-value per inch of any rigid board insulation available: approximately R-6.0 to R-6.5 per inch (LTTR — Long Term Thermal Resistance). A single 3-inch polyiso board delivers approximately R-18 to R-19.5. Two 3-inch boards installed in staggered layers produce approximately R-36 to R-39 — comfortably exceeding the R-30 code minimum. Two staggered layers of 3-inch polyiso is Protecht's standard above-deck insulation assembly on every Woodhaven commercial replacement job.
The staggered joint approach is not optional best practice — it is what delivers the designed R-value in the installed assembly. A single thick polyiso board has an unbroken thermal bridge at every joint edge. Two layers installed perpendicular with joints offset cover every joint in the bottom layer with solid board in the top layer, eliminating that thermal bridge. The National Roofing Contractors Association's 2023 manual endorses multi-layer installation as standard practice for exactly this reason.
Above the polyiso layers, a ½-inch high-density polyiso cover board provides the stable substrate for membrane attachment, protects the soft insulation from point loads during installation and service, improves hail resistance of the full assembly, and adds R-2 to R-2.5 to the system. ASHRAE 90.1-2022 also requires a continuous air barrier in commercial building envelopes — in a low-slope assembly this is typically achieved through taped insulation joints and a self-adhered air barrier membrane layer. All commercial permits in Woodhaven require documentation of the insulation R-value and compliance path, which Protecht prepares and submits on every job.
The Code-Compliant Assembly — Climate Zone 5, Bottom to Top
Every commercial replacement Protecht installs in Woodhaven uses this above-deck assembly as the standard starting point. Building-specific conditions are assessed and variations documented before the written scope is issued.
- Structural deckSteel, concrete, or wood — condition assessed and documented before any materials go down; rust, delamination, and section damage identified and priced
- Vapor retarder (where required)Specified based on building occupancy, HVAC conditions, and ASHRAE 90.1-2022 requirements for conditioned space below
- First layer: 3-inch polyiso (~R-18.5)Mechanically attached or set in low-rise adhesive; boards staggered in both directions; continuous air barrier at this layer
- Second layer: 3-inch polyiso (~R-18.5)Installed perpendicular to first layer; joints offset by minimum half-board; combined assembly: ~R-37, exceeding R-30 code minimum
- ½-inch high-density cover board (~R-2.5)Substrate for membrane; point-load protection; hail resistance improvement; membrane adhesion enhancement
- Total above-deck R-value: ~R-39.5Code compliant, performance-optimized for Michigan, and positioned for tightening future energy code requirements
- Membrane systemTPO, EPDM, modified bitumen, or metal as specified for the building type, use, and performance goals
- All flashings, edge metal, copings, penetration detailsInstalled to NRCA specification and manufacturer requirements for warranty compliance
Replacement vs. Recover — When the R-30 Code Applies
Not every Woodhaven commercial roofing job triggers the full R-30 requirement. Here's the distinction that determines the scope and cost.
- Full replacement (tear-off to deck): R-30 appliesASHRAE 90.1-2022 treats this as an alteration — minimum R-30 required. All existing insulation removed. New polyiso assembly installed to code.
- Recover (new membrane over existing): R-30 compliance via existing insulationWhen existing insulation is dry, sound, and meets R-30 minimum, a recover installs new membrane without removing the assembly. Core cuts verify this before any recover is specified.
- Core cuts determine the pathProtecht cuts cores to verify insulation moisture content and deck condition before committing to either approach. Wet insulation found during core cut assessment is removed and replaced — never buried under a new membrane.
- Tapered insulation for drainageBuildings with inadequate slope (less than ¼:12) require tapered polyiso to achieve positive drainage. Ponding water is the #1 accelerant of membrane aging. Protecht identifies ponding zones during the roof survey.
Five Commercial Roofing Systems — Choosing the Right One for Your Woodhaven Building
No Single System Is Right for Every Building — the Correct Specification Depends on Building Type, Use, Budget, and Performance Goals
Protecht installs all five major commercial roofing systems and does not have a preferred product that gets recommended regardless of fit. For Woodhaven's strip retail and auto service commercial stock, 60-mil TPO over two layers of staggered polyiso is the most common correct specification — energy-efficient, heat-welded seams, and well-suited to the low-slope flat decks that dominate this market. EPDM is the right call for larger warehouse and industrial footprints where seam economy matters. The written scope document Protecht issues after every assessment includes the system recommendation with the specific rationale for why that system was selected for the building — not just a price.
TPO
Most Common Correct Spec · Michigan Flat-Roof Commercial⚠ Not for restaurant/food service grease exhaust exposure — specify PVC
EPDM
Proven 60-Year Track Record · Large Roof Economics⚠ Seam adhesive maintenance is non-negotiable — budget for annual inspection
Modified Bitumen
Multi-Ply Redundancy · Penetration-Dense Buildings⚠ Torch application requires fire watch protocol on occupied buildings
Standing Seam Metal
40–70 Year Lifespan · No Exposed Fasteners · Solar-Ready⚠ Premium upfront cost; requires slope — not applicable to flat commercial decks
Corrugated Metal
Budget Metal · Agricultural & Secondary Structures⚠ Not appropriate for occupied commercial buildings with high leak sensitivity
Why Commercial Roof Replacement Starts With a Written Assessment — Not a Price
Core Cuts · Structural Deck Condition · Drainage Survey · Penetration Inventory · Written Scope Before Any Commitment
Roof Survey and Documentation
A commercial replacement proposal without a physical survey is a guess. Protecht conducts: visual inspection of all roof planes and parapets with photographic documentation; assessment of all flashings, edge metal, and parapet conditions; drainage adequacy evaluation to identify ponding zones requiring tapered insulation; inventory of all penetrations, HVAC curbs, skylights, and equipment requiring re-flashing; and structural deck condition assessment for rust, delamination, or section damage. Every condition found during the survey is documented before the written scope is issued. No surprises on the job and no change orders for conditions that a proper survey would have identified.
Core Cuts and Insulation Moisture Assessment
The most important diagnostic step on any Woodhaven commercial replacement or recover evaluation. Protecht cuts cores through the existing assembly at multiple representative locations to verify: existing insulation moisture content (wet insulation discovered during tear-off must be removed and replaced — wet insulation buried under a new membrane traps moisture and corrodes steel decks); existing insulation R-value and thickness relative to the R-30 code minimum; and deck condition beneath the insulation. Core cut results determine whether the job is a recover (existing insulation dry and code-compliant) or a full replacement — and what the real scope and cost will be before any commitment is made.
System Specification and Written Scope
After the survey and core cuts, Protecht produces a written scope document that includes: recommended system type with rationale specific to the Woodhaven building; insulation assembly specification meeting R-30 Climate Zone 5 code minimum; all flashing, edge metal, and parapet detail specifications; drainage improvements required for positive slope; any deck repair scope identified during survey; and specific material specifications by manufacturer and product. This document is the basis for the written estimate. No verbal commitments, no vague material allowances, no scope surprises at the invoice. The written scope is the homeowner's property regardless of whether they proceed with Protecht.
Permit and Warranty Documentation
City of Woodhaven Building Department permits are pulled before any work begins. The permit application documents the insulation R-value, system type, and code compliance path for the building department's review. After completion, Protecht provides: the signed-off permit and inspection documentation; manufacturer warranty registration (with NDL warranty documentation where applicable); a completion report with as-built photos; and any required building envelope compliance documentation. These documents have real value at sale, lease renewal, refinancing, and insurance review — a Woodhaven commercial building with documented code-compliant roofing in its file is a different asset from one without it.
Woodhaven's Commercial Building Stock — What We See and What It Needs
25-Plus Years of Commercial Roofing Experience in Wayne County
Woodhaven's commercial inventory runs along Allen Road, Van Horn Road, and the I-75 interchange corridors — a mix of strip retail centers, auto service shops, neighborhood commercial, and light industrial from the 1970s through the 1990s. Most of this stock is now 30 to 50 years old, originally roofed with built-up roofing (BUR) or early modified bitumen that is at or approaching end of service life. For Woodhaven's strip retail and auto service commercial stock, 60-mil TPO over two layers of staggered polyiso is the most common correct specification — energy-efficient, heat-welded seams, and well-suited to the low-slope flat decks that dominate this market. EPDM is the right call for larger warehouse and industrial footprints where seam economy matters. Protecht has served Wayne County commercial property owners for 25-plus years — long enough to have replaced roofs that we installed in the 1990s on the same buildings, and to know what Woodhaven's commercial inventory actually looks like from the roof surface rather than from a satellite image.
The most common finding on Woodhaven commercial assessment inspections is that existing insulation is well below the R-30 code minimum that now applies to full replacements. Buildings originally roofed in the 1970s and 1980s routinely have R-12 to R-18 insulation installed above the deck — half to two-thirds of what the current code requires. A full replacement is the legal trigger for bringing this up to R-30. The polyiso insulation upgrade is not optional on a full replacement, but it is a genuine performance investment: the energy cost savings from R-30 versus R-12 insulation in a Woodhaven commercial building over a 25-year membrane life are meaningful and partially offset the material cost over time.
The second most common finding is wet insulation beneath the existing membrane — moisture infiltration from slow leaks that has saturated the insulation layer without producing visible interior water damage. Wet insulation identified during core cut assessment must be removed and replaced, not recovered. Recovering wet insulation traps moisture in the assembly, accelerates steel deck corrosion, and eliminates the insulation's R-value in the saturated zones. Protecht's core cut protocol on every Woodhaven commercial job prevents this outcome.
Woodhaven Commercial Corridors & Districts
What Protecht Finds on Woodhaven Commercial Assessments
These are the findings that appear most consistently on commercial roof assessments in Woodhaven — the conditions that determine scope and drive cost on replacement projects.
- Sub-code insulation — R-12 to R-18 where R-30 is requiredPre-code commercial buildings in Woodhaven routinely have original above-deck insulation at half to two-thirds of the current minimum. A full replacement triggers the R-30 upgrade requirement under ASHRAE 90.1-2022. The polyiso layers add cost but deliver real energy performance return.
- Wet insulation beneath the existing membraneCore cuts commonly reveal moisture-saturated insulation from slow leaks that produced no visible interior damage. Wet insulation must be removed and replaced — not recovered. The scope and cost difference between a dry-insulation recover and a full replacement with wet insulation removal can be substantial; core cuts determine which path is appropriate.
- Steel deck corrosion beneath BUR systemsOlder BUR systems on Woodhaven's mid-century commercial stock frequently conceal steel deck rust beneath the insulation layer. Corrosion is found during tear-off — a cost that cannot be determined without physically removing the existing system. Deck repair scope is documented separately after discovery and priced before new materials go down.
- Ponding water zones from inadequate slopeLow-slope commercial decks with inadequate original slope develop low points over decades of thermal cycling and structural settling. Ponding water identified during the drainage survey requires tapered polyiso insulation to restore positive drainage — an additional scope item that extends membrane life and is worth the investment on any building where ponding is active.
- Failed EPDM seam adhesive on older buildingsEPDM systems from the 1990s and 2000s in Woodhaven's commercial inventory frequently show seam adhesive failure at exposed seam edges — UV degradation of the bonding adhesive is the most common EPDM failure mode. When seam failures are widespread and the membrane is otherwise sound, a targeted seam repair program may extend the system's life. When seam failures are extensive and the membrane is aged, replacement is the honest answer.
- Inadequate or missing flashing at HVAC curbs and parapetsThe detail work — flashings at HVAC curbs, parapet caps, penetrations, and roof-to-wall transitions — is where most commercial roofing failures originate. These areas are documented in the assessment survey and included in the replacement scope specification; no flashing detail is left to a field decision without documentation.
What Commercial Roof Replacement Costs in Woodhaven — and What the Timeline Looks Like
$6.50 to $13.00 per square foot installed depending on system selected, deck condition, and full scope; a 5,000 SF strip retail building in Woodhaven typically runs $32,000 to $60,000 fully installed including insulation upgrade to R-30. The primary cost variables on a Woodhaven commercial replacement are: system type (TPO and EPDM have similar installed costs; modified bitumen and standing seam are at the higher end; corrugated metal is the most economical); existing deck condition (structural deck repair discovered during tear-off is priced separately after discovery); insulation upgrade scope (bringing R-12 to R-18 existing insulation up to R-30 code minimum adds $1.50 to $3.00 per square foot in material); penetration count (each HVAC curb, plumbing stack, skylight, and drain requires re-flashing); and parapet and edge metal complexity.
The insulation upgrade cost is not a discretionary expense on a full replacement — it is a code requirement under ASHRAE 90.1-2022 for Woodhaven's Climate Zone 5 designation. However, the energy cost savings from R-30 versus R-12 insulation in a heated and cooled commercial building are real and measurable over the 25-to-30-year life of the new membrane. The additional insulation material cost is partly offset over time by lower heating and cooling costs — the building's HVAC system does less work every year after the replacement.
Most commercial replacements in Woodhaven complete in 2 to 5 business days for typical strip retail and office buildings; larger industrial or complex multi-section roofs require 1 to 2 weeks. City of Woodhaven Building Department permits are typically issued within 3 to 7 business days of application. Work can be phased on occupied buildings to limit disruption to tenant operations and business hours. Emergency temporary protection is available if the existing roof is actively leaking and a replacement is in process.
Commercial Replacement Cost Guide — Woodhaven
All estimates require on-site assessment and core cuts. Satellite measurements cannot determine deck condition, insulation moisture status, or penetration count. These ranges are representative — not a phone quote.
Serving Woodhaven Commercial Properties — 10 Minutes North Of Our Flat Rock Office
Protecht Exteriors serves all commercial properties in Woodhaven (48183) for roof replacement, repair, and storm damage assessment. Our Flat Rock office is 10 minutes north of our Flat Rock office. No out-of-area premiums, no unfamiliarity with local permit processes, and 25-plus years of commercial roofing experience in Wayne County.
City of Woodhaven Building Department — commercial permits required for full replacement Commercial permits are pulled before work begins on every job. Protecht carries full commercial liability insurance and workers' compensation coverage — verified documentation available on request for property management companies and institutional building owners requiring contractor pre-qualification.
Request Your Commercial Roof Assessment in Woodhaven
A commercial replacement decision measured in tens of thousands of dollars starts with an honest written assessment — not a phone quote or a satellite measurement. Protecht conducts a physical survey of the existing system, core cuts to verify insulation moisture content and deck condition, a drainage evaluation to identify ponding zones, and a full penetration inventory — and delivers a written scope with system recommendation before any commitment is required. The assessment is free. The written scope is yours regardless of whether you proceed with Protecht.
Here's what happens after you submit:
- We contact you within 1 business day to schedule your Woodhaven commercial assessment
- Physical roof survey with photographic documentation of all conditions found
- Core cuts to verify insulation moisture content and deck condition
- Drainage survey — ponding zones identified; tapered insulation scope determined
- System recommendation with written rationale for your specific building
- R-30 Climate Zone 5 code compliance verified or designed into the replacement scope
- Written estimate: system, insulation assembly, all flashing and edge metal scope specified
- City of Woodhaven Building Department permit process explained — Protecht handles all filings
What Woodhaven Property Owners Say About Protecht Exteriors
Real reviews from commercial and residential property owners across Woodhaven and Wayne County.
Woodhaven, MI Commercial Roof Replacement FAQs
Does the R-30 insulation code requirement apply to my Woodhaven commercial building?
Yes — if you are doing a full tear-off replacement. Michigan references ASHRAE 90.1-2022 for commercial energy compliance, and Woodhaven is in Climate Zone 5, which requires a minimum R-30 for insulation installed entirely above the roof deck. A full replacement is treated as an alteration under ASHRAE 90.1-2022 and must meet the R-30 minimum regardless of what the original insulation level was. Protecht meets this with two staggered layers of 3-inch polyiso, delivering approximately R-37 to R-39 — exceeding code and providing a performance buffer against future tightening standards.
Which commercial roofing system is right for my Woodhaven building?
For Woodhaven's strip retail and auto service commercial stock, 60-mil TPO over two layers of staggered polyiso is the most common correct specification — energy-efficient, heat-welded seams, and well-suited to the low-slope flat decks that dominate this market. EPDM is the right call for larger warehouse and industrial footprints where seam economy matters. The correct system for your specific building depends on roof size and geometry, occupancy type, energy performance goals, budget, and drainage condition. Protecht installs all five major commercial systems — TPO, EPDM, modified bitumen, standing seam metal, and corrugated metal — and does not have a preferred product. The system recommendation is in the written scope document produced after the free assessment, with specific rationale for the building.
How long does commercial roof replacement take in Woodhaven?
Most commercial replacements in Woodhaven complete in 2 to 5 business days for standard strip retail and office buildings. Larger industrial roofs or complex multi-section assemblies may require 1 to 2 weeks. City of Woodhaven Building Department permits are typically issued within 3 to 7 business days of application. Work can be phased on occupied buildings to limit disruption. Emergency temporary protection is available if the building is actively leaking while the replacement is in process.
What does commercial roof replacement cost in Woodhaven?
$6.50 to $13.00 per square foot installed depending on system selected, deck condition, and full scope; a 5,000 SF strip retail building in Woodhaven typically runs $32,000 to $60,000 fully installed including insulation upgrade to R-30. Primary cost variables: system type, existing deck condition (found during tear-off), insulation upgrade scope to R-30 if existing is sub-code, number of penetrations requiring re-flashing, drainage improvements, and parapet and edge metal complexity. The only accurate number comes from a written estimate after a physical assessment and core cuts — not a satellite quote or a phone estimate. Protecht provides the written estimate at no charge.
Does Protecht pull commercial permits in Woodhaven?
Yes — on every commercial job without exception. City of Woodhaven Building Department — commercial permits required for full replacement. The permit documents the insulation R-value, system type, and code compliance path. Skipping a commercial permit exposes the building owner to personal liability, voids manufacturer warranties, and creates complications at sale, lease renewal, and insurance claims. Protecht prepares all permit documentation and provides the signed-off permit to the building owner at job completion.
Your Woodhaven Commercial Roof Replacement Starts With an Honest Assessment — Not a Phone Quote.
Protecht installs all five major commercial roofing systems, specifies the right one for each building, pulls all City of Woodhaven Building Department permits, installs two staggered layers of polyiso to meet Michigan's R-30 Climate Zone 5 requirement, and delivers manufacturer NDL warranty documentation at completion. A commercial roof replacement is a 20-to-40-year decision. It deserves a written scope, a physical survey with core cuts, and a system recommendation chosen for your building — not the one that is fastest to install. The assessment is free. The written scope is yours before any commitment.
Where Technology and Construction meet
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