How do Penetrations Affect a Roof?
Roof penetrations appear on both steep and low-slope roofsRoof Types - Low-slope roofs (flat roofs) are a type of roof system with less than a 3:12 pitch, most commonly found on commercial and industrial buildings. More wherever plumbing, ventilation or other equipment needs a path through the roof. They are the most common source of roof leaks.
A roof covering works best when its surface is continuous. A penetration interrupts that surface with an opening, so the surrounding flashing has to direct water around the opening and tie the penetration back into the roof systemRoof Types - A roof system (roof assembly) is the entire series of roofing layers and components above the roof deck that work together to weatherproof the building. More.
Penetrations are often mentioned in estimates and inspections because each one requires its own waterproofing or flashing detail. A roof with many penetrations takes more labor to install, repair or replace than a roof with fewer penetrations.