How do I know if a commercial roof needs replacement or just repair?

The decision framework

Evidence	Repair	Recover	Replace
Wet insulation area (moisture survey)	Under ~10%	10 - 25% (remove wet areas)	Over ~25%
Membrane condition	Sound, isolated defects	Weathered but stable substrate	Brittle, shrinking, widespread open seams, granule loss to felt
Leak pattern	One or two locations	Multiple but localized	Chronic, moving, multiple planes
Age vs service life	Well inside expected life	Near end of life	Past expected life
Existing roof layers	Any	One layer only (code limit)	Two or more layers present
Deck condition	Sound	Sound	Corroded, delaminated or deteriorated

Typical service lives

Expected service life gives you the frame, and condition gives you the answer. Built-up and modified bitumen commonly run 15-25 years, TPO and PVC 15-25 years depending on thickness and detailing, EPDM 20-30 years, spray polyurethane foam 15-20 years with recoating, standing seam metal 30-45 years, and concrete or clay tile 40-plus years with underlayment replacement in between. A 22-year-old BUR with three patched generations is a replacement conversation; a 9-year-old TPO with two bad penetrations is a repair.

Get the moisture data before deciding

Visual inspection cannot tell you how much insulation is wet. Infrared thermography, capacitance or nuclear surveys can, typically for $0.03-$0.10 per square foot. That data is what separates a defensible $60,000 partial repair from an avoidable $500,000 full tear-off, and vice versa - it just as often proves that a roof the owner hoped to patch is saturated across a third of its area.

The repair-spend test

Compare annual repair spend to replacement cost. Once you are spending 3-5 percent of replacement cost per year on recurring leak repairs, you are financing a new roof without getting one. Add the cost of tenant disruption, damaged inventory and interior finish repair, which owners consistently exclude from the comparison.

Recover versus tear-off

A recover installs a new membrane over the existing system and is cheaper and faster, but code generally limits a roof to two total layers, wet insulation must still be removed, and the existing deck and attachment must be adequate. If a roof already has two layers, or if the survey shows widespread saturation, tear-off is the only compliant path.

What we deliver

Our roof reports give you membrane and detail condition with captioned photographs, drainage and ponding evidence, penetration condition, an estimated remaining service life, and a replacement cost range placed in the capital reserve table - so the repair-or-replace decision is made against numbers rather than impressions.