Fiberglass shingles are popular for their durability and resistance to fire and moisture, but leaks around pipe boots—those rubber collars that seal vent pipes—are a common issue homeowners encounter. These leaks often happen because the pipe boot's flexible rubber flange can crack or shrink over time due to UV exposure and temperature changes, breaking the watertight seal. Additionally, improper installation, such as failing to lift adjoining shingles to insert the boot correctly or using the wrong size boot for the pipe diameter, can cause gaps where water can seep in. Simple diagnostics include looking for water stains on the attic ceiling directly under vent pipes or inspecting the pipe boot itself for visible cracks or dry rot. If it’s safe to do so, a homeowner can gently lift shingles around the boot to check for gaps or worn roofing cement. However, avoid walking on a fragile roof or forcing the shingles, as this can cause more damage.
When you call a roofer, it’s good to ask specific questions to ensure a proper and lasting repair. For instance, ask if they will replace the pipe boot with one that matches your pipe size and if they can install a high-quality flashing or metal collar to improve waterproofing. It's also smart to inquire whether they will inspect the boot for compatibility with your fiberglass shingles and check the surrounding shingles for damage that might need fixing. Repairing leaks around pipe boots is crucial to maintaining your roof’s warranty, so ensure any work is done per manufacturer guidelines. Professional roofers can offer a more secure seal using specialized materials and techniques, avoiding recurring leaks and saving you from costly water damage down the line.