Six signals it's time to replace
1. Saturated insulation across significant area
Moisture survey shows wet insulation across 25 percent or more of the roof. A coating cannot fix this. The wet insulation is no longer providing R-value, the deck underneath is at risk, and the only honest answer is replacement.
2. Recurring leaks in multiple locations
One leak is a repair. Two are a maintenance issue. Five in different parts of the same roof are a system problem. When repair calls become routine, you're past restoration and into replacement territory.
3. Membrane is at or past its rated life
A 25-year-old EPDM roof might still look intact, but the membrane and seam chemistry are at end of life. The next major storm event will tell you what the roof actually has left.
4. Climbing annual repair costs
Track your roof spend over the last 3 to 5 years. If the line is going up steeply, you're funding a roof that's failing on its way out instead of investing in one that will protect the building for the next 25 years.
5. Structural or deck concerns
Soft spots in the deck, sagging between joists, or visible underside damage are reasons to pull back the membrane and look. Significant deck damage usually means full tear-off and likely deck repair, not patching.
6. Major facility changes coming
Rooftop equipment additions, building expansion, energy code requirements, or a planned sale. If significant change is coming inside the next 5 to 7 years, it may be cheaper to replace the roof as part of that work than to coat now and replace later.
How to decide if your roof actually qualifies
- Get a full condition assessment, including moisture survey.
- Pull your repair history for the last 5 years.
- Confirm the membrane's age, original spec, and any remaining warranty.
- Walk the underside where accessible.
- Get bids on both restoration and replacement, with the same scope detail.
Replacement options
Tear off and replace
Full removal of the existing roof, insulation, and any damaged decking, followed by a new system. Most expensive option, longest life, cleanest reset.
Recover
New roof installed over the existing one, where code allows (most Indiana commercial buildings allow up to two roof systems). Saves 20 to 30 percent on cost. Only viable when the existing insulation is dry.
Restoration coating
Not technically replacement, but worth considering one more time before committing to full replacement. If the roof qualifies, 15 to 20 more years of service at 30 to 60 percent of replacement cost.
What it costs
Full commercial roof replacement in Northern Indiana typically runs $10 to $20 per square foot, varying by system, insulation, deck condition, and access. A 50,000 square foot building lands roughly $500,000 to $900,000 for a full TPO or EPDM tear-off and replacement. See our cost guide for more detail.
Timing the project
- Plan 6 to 12 months out for design and bidding.
- Late spring through early fall is the standard installation window in Indiana.
- Avoid emergency timelines when possible. Emergency pricing runs 15 to 30 percent over planned project pricing.
- Coordinate with any planned interior renovations or HVAC work.
What to expect during a replacement
- Material staging, often in the parking lot or on the roof itself.
- Crew on-site for the duration of work, typically 4 to 12 weeks depending on size.
- Daily watertight conditions at end of each work day during phased tear-off.
- Manufacturer inspection mid-project and at completion.
- Warranty documentation and final close-out package.