Flashing Failures: The Hidden Leak Problem in Michigan Homes
Short answer
To stop flashing failures from creating a hidden leak problem in Michigan homes, systematically repair degraded transition barriers and vulnerable joints before interior water damage occurs. Survey data from Project Pinpoint indicates that flashing accounted for 14% of reported problems on built-up roofing systems. Under Michigan State Housing Development Authority standards, leaking flashing must be repaired on otherwise functional pitched roofs, while leak-free built-up systems require flashing repairs whenever component durability is questionable.
“Flashing is the most underrated of building enclosure components and arguably one of the most important.”
Building America Solution Center, National Laboratory Research Guide, Pacific Northwest National Laboratory
“In reality, drip edge flashing is often too short and doesn’t overlap into the gutters.”
Uli Sommers, Home Inspector, InspectorPro Insurance
Flashing consists of thin pieces of impervious material installed to prevent the passage of water into a structure, yet damaged flashing is a common reason homes fail inspection. Project Pinpoint survey data covering built-up roofing problems between 1983 and 1992 revealed that flashing accounted for 14% of reported problems. When metal components fail at junctions, water slips beneath the primary exterior covering and rots structural framing long before ceiling spots appear indoors.
- Inspect transitions
- Check drip edge overlap
- Repair leaking flashing
- Re-coat low-slope decks
Michigan Housing Standards for Flashing Maintenance and Roof Repairs#
Under Michigan housing rehabilitation standards, flashing must be repaired on functional pitched roofs as well as leak-free built-up roofs when its condition is questionable. Under Michigan State Housing Development Authority (MSHDA) Neighborhood Development Division rehabilitation standards, missing and leaking shingles and flashing will be repaired on otherwise functional pitched roofs (michigan.gov). Inspectors do not require replacing an entire roof slope if the underlying structure and materials remain sound.
Low-slope architecture follows an equally specific maintenance standard under state guidelines.
Homeowners evaluating their properties under these guidelines can apply a clear sequence:
- Evaluate whether pitched slopes remain functional aside from isolated flashing faults (michigan.gov).
- Spot-repair missing or leaking flashing on pitched sections to restore weather resistance.
- Re-coat functional low-slope built-up surfaces that show no active leaks.
- Repair all low-slope flashing details and accessories whenever their service lifespan is doubtful.
Flashing Defects, Water Intrusion, and Home Inspection Findings#
Improperly installed drip edge flashing creates hidden pathways for moisture that directly trigger home inspection failures. InspectorPro Insurance explained in 2025 that drip edge flashing is often too short and does not overlap into gutters (inspectorproinsurance.com). When wind-driven rain pushes water behind short metal edges, the runoff soaks the structural fascia boards rather than draining into the gutter trough.
Drip edge and flashing installation mistakes carry serious financial and structural consequences during property sales. GEICO reported in 2026 that damaged flashing or visible leaks represent common reasons homes fail inspection (geico.com). Missing overlaps and compromised seams allow moisture to rot exterior trim while remaining hidden from a casual ground-level glance.
The roofing discipline treats water management as a coordinated barrier system where metal edges and roof drainage must channel runoff completely clear of the structure.
Historical Prevalence of Flashing Failures on Low-Slope Roofs#
Built-up flat and low-slope assemblies have long exhibited vulnerabilities at edge terminations and vertical transitions.
Even though flat membranes cover the vast majority of roof square footage, perimeter and penetration joints endure concentrated mechanical strain. Survey findings from Project Pinpoint confirmed that flashing issues represented 14% of the problems logged across the survey period. Thermal movement, structural settling, and persistent moisture exposure cause rigid joints to pull away if joints lack flexible detailing.
Critical Roof Transitions and Flashing Details in Michigan Climates#
Water drainage applies directly to whole building assemblies including walls, roofs, and foundations, as well as transitions such as lower roofs, porch roofs, decks, balconies, railings, and dormers (basc.pnnl.gov). Junctions between distinct planes collect high volumes of runoff, making them vulnerable points for water penetration.
Proper exterior protection requires several coordinated components working together:
- Step flashing cards set between shingle courses along dormers and vertical sidewalls.
- Continuous counter-flashing grooved into masonry joints to shield vertical junctions from driven moisture.
- Dedicated kick-out flashing placed where eave edges meet exterior siding to push water into gutters.
- Protective ice and water shield installed along eaves and valleys beneath the primary shingle layers.
- Correctly sized drip edge metal extended down into the gutter channels along all roof perimeters (inspectorproinsurance.com).
Property owners across Northville, Novi, Plymouth, Canton, Livonia, and Farmington Hills can safeguard their investments this week by checking attic rafters for damp wood and scheduling a professional evaluation of all wall-to-roof transitions.
| Roof Type | Surface Condition | Flashing / Shingle Condition | Mandated Rehabilitation Action |
|---|---|---|---|
| Pitched Roof | Otherwise functional | Missing or leaking shingles and flashing | Repair missing and leaking shingles and flashing; slate, metal, and tile repaired when possible |
| Flat & Low-Slope Roof | Leak-free built-up membrane | Flashing and accessories have questionable minimum life | Re-coat the built-up roofing surface and repair flashing and accessories |
| Drainage Category | Building Components and Transition Interfaces | Key Water Protection Detail |
|---|---|---|
| Primary Building Assemblies | Walls, roofs, foundations | Layered drainage materials directing water down, out, and away from the building |
| Transition Interfaces | Lower roofs, porch roofs, decks, balconies, railings, dormers | Integrated metal flashing and self-adhesive flashing tapes integrated into drainage planes |
| Roof Perimeter Junctions | Eaves, fascia boards, gutters | Drip edge flashing sized with adequate length to overlap directly into gutter troughs |
Roof Flashing Repair vs. Replacement Cost Estimator
Calculates estimated targeted flashing repair costs versus full roof replacement reference costs, factoring in junction type (chimney, wall step flashing, valleys, or plumbing pipe boots) and underlying rotted decking repair.
Flashing Repair & Labor Subtotal:
Underlying Substrate / Plywood Repair:
Estimated Targeted Flashing Repair Total:
Baseline Full Roof Replacement Estimate (Comparison):
Frequently Asked Questions
What are the common problems with roof flashing?
Common defects include damaged or deteriorating flashing materials, missing flashing sections, and drip edge flashing that is cut too short to overlap into gutters, which allows wind-driven rain to bypass the gutter and rot fascia boards. Flashing issues accounted for 14% of reported built-up roofing problems in Project Pinpoint data.
Disclaimer
This content is general information about roofing and home-exterior work and is not a substitute for an on-site inspection. Contact Horizon Roofing & Construction for advice specific to your home.
Sources
- Flashing (weatherproofing) - Wikipedia - en.wikipedia.org (2005-12-05)
- RESIDENTIAL HOUSING REHABILITATION STANDARDS - michigan.gov (2026-10-02)
- web.ornl.gov - web.ornl.gov (2026-10-02)
- Flashing of Roof-Wall Intersections in Existing Homes | Building America Solution Center - basc.pnnl.gov
- 20 Common Things That Fail a Home Inspection Plus Steps to Take | GEICO - geico.com (2026-09-18)
- 4 Most Common Causes of Premature Roof Failure - inspectorproinsurance.com (2025-05-01)