What do roofers do about abandoned roof penetrations when starting a roof replacement? These unused openings may have been from previous plumbing, HVAC or other systems. While these systems have been relocated, disconnected or removed, the penetrations often remain behind. Roofers committed to achieving the best results for their clients will remove abandoned penetrations to prevent future problems.
This article highlights the risks associated with leaving unused penetrations, accompanied by an example from one of our recent projects.
The risks of abandoned roof penetrations
Regardless of whether removing abandoned roof penetrations is in the scope of work or not, this step should never be skipped before replacing the roof. Simply covering up the penetrations can lead to these serious issues:
- Leaks
- Damp insulation
- Mould, mildew and other biological growth
- Thermal bridging and energy loss
- Tripping hazards
- Voided warranties
- Roof membrane compromise
- Structural degradation
Both functional and abandoned roof penetrations are common sources of leaks. When working on a tear-off, avoid these potential issues. Ensure that your roofer prepares to remove all abandoned roof penetrations during your roof removal process.
The Elite Team’s Viewpoint on Abandoned Roof Penetrations
30 Abandoned Roof Penetrations at 101 Brisbane Road, Toronto
Background: One of our recent projects included removing approximately 30 abandoned roof penetrations. The objective was to restore the roof to the base building condition, making it suitable for any commercial or industrial tenant.
While not always the case, the client was aware and their engineer informed us about these abandoned penetrations at the tender stage. The removal of the abandoned roof penetrations was included in the scope of work.
Why Elite prefers to remove abandoned roof penetrations
Insisting on best practices
We typically include removing abandoned roof penetrations in our proposals so we can achieve the best outcomes for our clients. Removing 30 penetrations increases the cost of a new roof. However, it’s not in anyone’s best interest to complete a roof, only to have it perform poorly down the line. The potential damage caused by abandoned roof penetrations can cost thousands of dollars in future repairs (outside of warranty coverage) and a shortened lifespan for the roof. The roofer’s reputation can also be on the line.
Our emphasis on removing unused penetrations doesn’t necessarily make us the lowest-priced roofing contractor. Our primary concern is the long-term performance of your roof, according to your requirements.
Do we always know about abandoned roof penetrations in advance?
No, sometimes the scope of work has been determined before the abandoned roof penetrations are found. They may be discovered during a roofing pre-start walk-through or told to us by the project’s HVAC contractor early in the process. In these cases, Elite is transparent with the owner about the roof’s condition and we will work with you on a mutually agreed upon solution that aligns with your goals. You are assured of a high-performing roof, without any of the issues that can be caused by abandoned roof penetrations.
Hire a high-quality roofing contractor for a high-performing roof
Any roof replacement process may have surprises along the way. Whether the issue is abandoned roof penetrations or another situation, we will never take a shortcut that compromises your roof’s performance—now or in the future. We work with our clients to find a solution that is agreeable to all parties. Get the #EliteAdvantage.



