Commercial flat roofs in Lansing, MI, rarely fail all at once. Problems behind costly damage often start small, and many show visible signs before a leak reaches the ceiling tiles. The right fix also matters: a seam, flashing or blister repaired with incompatible material can fail again.
Flat roof repair starts with identifying the damage and selecting materials compatible with the existing roof. Call Armor Commercial Roofing at (517) 617-6953 to discuss flat roof repair in Lansing, MI and arrange a roof assessment before a minor issue becomes a major one.
Flat Roof Repair Warning Signs You Shouldn’t Ignore
Some building owners do not notice roof trouble until water shows up inside. By then, the problem may have affected materials beneath the membrane. Catching damage while it is localized can make repair more practical and help avoid extensive replacement work.
Michigan’s weather puts flat roofs through a hard annual cycle. Spring thaw, summer heat, fall rain and long winters each stress roofing systems differently. Lansing buildings that go years between inspections can accumulate damage without obvious interior symptoms.
Professional roof checks in spring and fall help identify developing problems. Warning signs include:
- Water still standing roughly 48 hours after rain under suitable drying conditions
- Lifted, open or bubbled seams
- Cracked or loose flashing at walls, curbs, drains and rooftop units
- Blisters, cracks, splits or punctures in the membrane
- Soft or spongy areas that warrant further investigation
- Interior stains or musty odors
Rising energy bills can have many causes, but damaged or wet roof insulation may be worth investigating when other roof problems are present.
Ponding Water Problem on Flat Roofs
Standing water that remains for more than roughly 48 hours after rain deserves investigation, taking weather and drying conditions into account. Flat roofs need effective drainage. When drains clog or low spots form from deck deflection or insulation compression, water can collect.
Ponding adds load and can contribute to deterioration of vulnerable roof details. Its effect on membranes and adhesives depends on the roofing system. Michigan’s freeze-thaw cycles can also stress existing openings and drainage details.
Other clues that ponding occurs, even when the roof is dry, include:
- Rings of dirt, debris or algae marking where water sat
- Vegetation growing in low areas
- Localized granule loss or surface wear on modified bitumen
- Debris piled around drains and scuppers
Keeping drainage outlets clear and investigating recurring low spots can help prevent more extensive flat roof repair work.
Seam and Flashing Failure Demands Flat Roof Repair
Seams and flashings are common failure points. They connect membrane sheets or seal the roof where it meets walls, curbs and penetrations. Movement, aging and installation defects can weaken these details.
On TPO, EPDM and PVC roofs, warning signs may include lifted edges, bubbled laps, wrinkles or visible separation. On EPDM details that require lap sealant, cracked or missing sealant also deserves attention.
Flashings around HVAC units, roof drains, pipe boots, skylights and parapet walls may crack, pull away, develop loose terminations or open at the top edge. Shrinking membranes can also pull flashing tight and bridge it away from inside corners.
These conditions should be assessed before water reaches the insulation. Wet insulation can lose thermal performance and contribute to deterioration of wood or steel decking.
What Surface Blistering Means for Flat Roof Repairs
Blisters are raised areas that can develop when trapped air or moisture expands beneath a roofing layer. Poor adhesion, application over a damp substrate and other assembly conditions can contribute. Blisters occur on built-up and modified bitumen roofs and on some coated surfaces.
Small, stable blisters may be monitored when appropriate for the system. Growing, damaged or cracked blisters need closer evaluation because they may create a path for water.
A blister alone does not prove that insulation is wet. Its cause and the condition of the surrounding roof should determine whether monitoring, testing or repair is needed.
Other Surface Defects That Signal Flat Roof Repair
Beyond ponding, seams and blisters, other defects found on commercial roofs include:
- Punctures and tears from foot traffic, dropped tools, equipment service or storm damage
- Cracking and splitting associated with aging or movement
- Alligatoring on asphalt-based surfaces, which creates a pattern of cracks
- Membrane shrinkage on older EPDM, pulling at seams, corners and perimeter edges
- Soft areas that may indicate wet insulation or other underlying problems
- Exposed reinforcing fabric where a single-ply membrane’s surface has worn away
These conditions require evaluation. Some need localized repairs, while widespread deterioration may call for a broader plan.
Compatible Flat Roof Repairs for Failed Seams
A lasting seam repair uses materials and procedures approved for the existing roofing system. Incompatible products can interfere with adhesion and make later repairs harder. Common approaches include:
| Membrane | Common Seam Problem | Compatible Seam Repair |
|---|---|---|
| TPO | Open or incomplete welds, lifted laps | Prepare the existing membrane and assess weldability. Re-weld or install an approved TPO patch or cover strip as appropriate. |
| PVC | Weld separation or deteriorated lap edges | Use compatible PVC repair materials and approved preparation and welding procedures. TPO is not a substitute. |
| EPDM | Failed splice materials or lifted seam edges | Clean and prime as specified, then install approved seam tape or a cover strip. Apply lap sealant where required. Cured EPDM is not hot-air welded like TPO or PVC. |
| Modified bitumen | Open laps or curling edges | Repair the lap or install a compatible strip using an approved method suited to the system and site conditions. |
| Built-up roofing (BUR) | Splits or open felt laps | Install a compatible reinforced multi-ply repair and restore the protective surfacing. |
Nearby seams should also be checked using methods appropriate for the roof system. Similar exposure and aging can affect more than the visibly damaged area.
Compatible Flat Roof Repairs for Flashings and Penetrations
Flashing repairs need to address the failed detail. Sealant can be part of an approved repair, but applying it over loose or damaged flashing may leave the underlying problem unresolved.
- Parapet and wall flashings: Repair or replace failed flashing, restore securement and complete the required top termination and protection.
- HVAC curbs and rooftop units: Use compatible flashing and corner details, with attention to curb condition, height and top termination.
- Pipe boots and vents: Replace damaged boots or use an approved field-formed detail, including the specified clamp and top seal.
- Roof drains: Inspect the drain body, membrane connection, clamping ring and surrounding slope. Repair the components responsible for leakage.
- Pitch pans: Remove failed material and restore the detail with compatible filler, or use another approved flashing arrangement where practical.
- Edge metal and scuppers: Restore securement and compatible membrane transitions according to the system requirements.
The wall above the flashing also deserves attention. Water entering through masonry, coping joints or other wall details can travel behind sound roof flashing and resemble a roof leak.
Compatible Flat Roof Repairs for Surface Defects, Blisters and Ponding
Surface repairs follow the same rule as seams: use compatible materials and address the cause.
- Punctures, tears and cracks: Prepare the surface and install an approved patch with the required overlap. TPO and PVC commonly use welded patches, while EPDM uses compatible primed and bonded repair materials. Modified bitumen requires a system-appropriate repair.
- Blisters: Small, stable blisters may be monitored. Damaged or active blisters need evaluation and an approved repair. Wet materials discovered beneath the surface must be addressed before the roof is closed.
- Alligatoring and worn surfacing: Compatible surfacing or coating may help where the existing roof remains suitable. Exposed scrim and widespread deterioration require closer assessment; coating alone may not be sufficient.
- Wet insulation and soft areas: Confirm the cause, remove unsuitable wet or damaged materials, assess the deck and rebuild the affected assembly with compatible materials.
- Ponding: Clear blocked outlets first. Persistent low spots may require tapered insulation, crickets, corrected drain elevations, additional drainage or structural evaluation, depending on the cause.
Why Compatible Repairs Keep Your Flat Roof Working Longer
A repair depends on its bond to the existing roof. Compatible materials and proper detailing help patches, seams and flashings accommodate normal movement through Michigan’s temperature changes.
The right repair also protects the existing investment. Manufacturer warranties may require approved repair materials and procedures, so check the written terms before work begins.
When damage is localized, underlying materials are suitable and the membrane remains serviceable, targeted flat roof repair can be practical. If moisture or deterioration is widespread, flat roof replacement in Lansing, MI may be the better long-term option. An inspection, with further testing where needed, helps distinguish those situations.
A Flat Roof Repair Process for Lansing Buildings
- Inspect the roof: Examine the surface, seams, flashings, drains and penetrations, along with accessible interior evidence of leaks.
- Investigate moisture: Where hidden moisture is suspected, suitable testing may include infrared scanning, moisture surveys or core samples. Findings need appropriate interpretation and verification.
- Identify the roofing system: Establish the membrane type and condition so repair materials and procedures are compatible.
- Document the findings: Photos, locations and clear repair priorities help the owner understand the proposed scope.
- Repair and check: Complete the approved repairs and inspect them using methods appropriate for the system. Address related drainage concerns within the agreed scope.
Act on Flat Roof Repair Before Winter Arrives
Roof defects left unresolved in fall can worsen through winter. Prompt assessment helps establish which problems need immediate repairs and which require further investigation or planning.
Building owners comparing options outside Lansing can also read about flat roof repair in Angola, IN.
Call Armor Commercial Roofing at (517) 617-6953 to discuss your Lansing commercial roof and arrange an assessment before small problems become more extensive.
Frequently Asked Questions
How soon after a Michigan winter should I schedule flat roof repair?
Arrange a spring inspection when the roof can be safely accessed and assessed after snowmelt. Active leaks should receive prompt attention rather than wait for spring. Repair methods and scheduling depend on surface conditions and product requirements. A fall inspection also helps identify problems before winter.
Can I tell if my flat roof has water in the insulation without tearing it up?
Non-destructive methods such as infrared scanning or suitable moisture meters can help identify suspect areas. They do not automatically confirm moisture or measure its full extent on every roof. Verification may require core samples or other investigation.
Does ponding water void my flat roof warranty?
Coverage depends on the specific warranty. Some exclude certain ponding-related damage or require drainage problems to be corrected. Review the written terms and document recurring standing water.
Can a flat roof seam be repaired, or does the whole roof need replacing?
Localized seam failure can often be repaired when the surrounding membrane remains suitable. TPO and PVC may accept approved welded repairs, while EPDM commonly uses compatible tape or cover strips. Extensive deterioration or wet underlying materials can change the recommended scope.
Can I use roofing tar or caulk on my flat roof leak?
Do not apply unapproved tar, cement or sealant to a roof membrane. Incompatible products can damage the surface or interfere with permanent repairs. Use materials and details approved for the existing roofing system.
How long does a flat roof repair typically take on a commercial building?
A small repair may be completed during one visit, while larger repairs can require several days or longer. Timing depends on access, weather, preparation, hidden damage, material requirements and the agreed repair scope.