When penetrating an existing roof for conduits, the best practice is generally to include the penetration itself in your scope of work, along with the sealing and any necessary flashing. Excluding the penetration and stating "by others" can lead to confusion, finger-pointing, and potential leaks if not coordinated perfectly.Here's a breakdown of why and how to approach it

Why Include the Penetration (Generally Preferred):
Single Point of Responsibility

You're the conduit installer. Having responsibility for the entire penetration, from the initial hole to the final seal, reduces ambiguity and makes you accountable for the integrity of the roof. If a leak develops, it's on you to fix it.

Coordination Issues

Relying on others for the penetration introduces a high risk of coordination failures. Did they cut the hole in the right spot? Is it the right size? Is it square? Did they properly prepare the substrate for your flashing? These problems can delay the project and increase costs.

Warranty Issues

If you only do the sealing and flashing, the roofer (or whoever cut the hole) might refuse responsibility if a leak occurs, claiming it's due to the conduit installation. Having a clear scope avoids this situation.

Control Over Quality

You want to ensure the penetration is done correctly to accept your conduit and sealing methods. You have better control over the final quality by managing the entire process.

Safety

Roof work is inherently dangerous. Managing the entire process helps ensure safety protocols are followed.

When "By Others" Might Be Acceptable (Rare)



Existing Penetration

If the penetration already exists and is the correct size and location, and is properly flashed, you might be able to exclude it, focusing solely on sealing around the conduit. Even then, carefully inspect the existing penetration for damage or improper flashing. Document everything.

Very Specific Project Requirements

Sometimes a project owner or general contractor insists on using a specific roofer for all roof work. In this case, you must have clear communication and documentation, including detailed specifications for the penetration (size, location, type of flashing, etc.). Get sign-off from all parties involved.

Cost Savings (Potentially Shortsighted)

Sometimes the "by others" approach is chosen to ostensibly save money, but the coordination and potential liability problems usually outweigh any cost savings.

How to Handle Including the Penetration


Clear Scope of Work

Your bid or contract should explicitly state that you are responsible for "all penetrations required for conduit installation, including cutting the opening, ensuring proper fit, and providing all necessary sealing, flashing, and weatherproofing."2.

Proper Tools and Materials

Ensure you have the right tools for the job, including core drills, saws, and flashing materials compatible with the existing roof membrane.3.

Roofing Expertise

Either have experienced roofers on your team or partner with a reputable roofing contractor to ensure the penetrations are done correctly and meet local building codes.4.

Manufacturer's Recommendations

Follow the conduit and roofing material manufacturers' recommendations for penetration and sealing methods.5.

Inspection and Documentation

Thoroughly inspect the completed penetrations and document the process with photos or videos.6.

Warranty

Provide a warranty that covers the penetration and sealing against leaks.

Example Wording for Scope of Work

* "Provide and install all roof penetrations necessary for conduit routing, including cutting, coring, and sealing. Penetrations shall be flashed per manufacturer's specifications and local building codes to ensure a watertight seal. [Your Company] is responsible for the integrity of the roof penetrations and provides a [Number] year warranty against leaks."

In summary, while "by others" is possible in limited circumstances, it's generally far safer and more professional to include the penetration itself in your scope of work. This minimizes risk, improves coordination, and provides a clear line of responsibility for the integrity of the roof. Flag for review