Take a Walk to Properly Inspect a Commercial Roof

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Commercial reroof job walks are very important to assess the existing roof system. They help you learn the steps needed to remove and install a new roof system efficiently while minimizing occupant impact and maximizing profitability. An improperly assessed building can easily move the project from the black into the red. With a fairly simple checklist and an inspection kit, you can make a thorough assessment on the roof and minimize costly hidden pitfalls to help you land the job.

Let’s start with your basic tool kit. Most of the time, you will need to climb a ladder to get onto the roof, and a safe way to transport your tools is to put them in a simple backpack. Here are the supplies you should carry with you:

  • Camera (video capability is highly recommended)
  • Tape measure (25’ is sufficient)
  • Measuring wheel
  • Roof plan or aerial photo for making notes (Google Earth, for example)
  • Note pad and pencil
  • Flashlight
  • Golf ball (it is important to know where the water goes)
  • Laser temperature gun
  • Roof core cutter
  • Repair medium (such as plastic cement) to temporarily patch a core cut
  • Infrared moisture scanner, if possible (hired services are also available)
  • Spare batteries for all electronic devices

Once you’re on a roof, you’ll want to make a thorough assessment and minimize your time up there. However, keep in mind that sometimes you only get one shot to access the roof, so make sure to cover everything. Here is the basic information to collect:

  • Building location
  • Access for equipment, loading, staging, waste removal, etc. (be sure to consider the safety of pedestrians below and other trades working)
  • Will the building be occupied or empty during roof installation?
  • Safety requirements (fall protection, hazmat abatement, noise, debris, etc.)
  • Chronological order and locations of other trades (any trades following roofing may need to take precautions to protect your work, such as stucco or metalwork over a single-ply roof)
  • Substrate type
  • Roofing system
  • Desired warranty term
  • Height of all roof decks and parapets (for both safety and loading materials)
  • Where and how the system terminates on all planes
  • Specifics of immediately adjacent trades (HVAC, plumbing, metal, stucco, etc.), including who covers the details that are often overlooked, such as wood blocking, drains, pipe flashings, metal flashings, etc.
  • Establish with the person controlling the schedule (usually the general contractor, consultant, or owner) whether the project will be phased or available all at once

Once you have all those answers, it is time to walk the roof. Be sure to double check measurements on the roof plan with the measuring wheel. Take time to observe the general condition of the existing membrane, because it will give you clues about the maintenance, drainage, environmental conditions, and occupant’s use. Use your golf ball in any area that the drainage is not completely obvious. Observe, measure, count, and photograph every type of penetration, and note whether electrical, gas, and plumbing lines will be disconnected or remain as is. Make notes on your roof plan for yourself, as well as concerns for the superintendent and/or foreman (you may want to bring different colored pens or highlighters to make identification easier). Helpful tip: take video pans across different areas of the roof. This will allow you to “revisit” the roof in case you missed something on your initial inspection.Visit the inside of the building to look for signs of leaks and try to examine the underside of the roof deck whenever possible.

In commercial construction projects, a small overlooked detail can lead to huge unforeseen costs, so it is critical to cover all the bases. Create a checklist and follow it every time. A successful project starts with a thorough roof walk.

For more information on roof safety, see our Commercial Roof Safety Guide.



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