What Happens During a Commercial Roof Inspection?

A professional commercial roof inspection is the essential first step before any roofing decision. Here's what a thorough inspection actually involves.

Visual Membrane Assessment

The inspector walks the entire roof surface documenting: membrane condition (cracking, blistering, delamination), seam adhesion status, flashing condition at all penetrations and edges, surface granule loss or oxidation, drainage patterns and ponding areas, and any visible punctures or mechanical damage. Photos document findings at each problem area.

Core Samples

Core samples are the most critical part of any pre-restoration inspection. The inspector removes small plugs (typically 4–6 inch diameter) from multiple locations across the roof — including areas that appear sound as well as areas with visible problems. Each core reveals the condition of the membrane, insulation, and any moisture present beneath the surface. Core locations are typically patched after sampling.

Infrared Scan (for Larger Roofs)

On roofs over approximately 20,000 sq ft, an infrared scan performed at dusk maps wet insulation locations across the entire roof efficiently. This helps determine the overall extent of moisture infiltration and guides where core samples should be taken.

Drain and Drainage Assessment

The inspector checks all drains and scuppers for blockage, assesses slope and drainage patterns, and identifies any areas of chronic ponding.

Written Report

A professional inspection concludes with a written report including: photos of all findings, core sample results, moisture extent estimate, and a clear recommendation with supporting data. This report is the basis for your roofing decision.