These terms appear in inspection reports, contractor proposals, and roofing conversations regardless of which system is on the building.
- Flashing
- The material, typically metal, modified bitumen, or TPO/EPDM sheet, used to seal transitions between the roofing membrane and vertical surfaces, penetrations, and perimeter edges. Includes base flashings (membrane to wall), counterflashings (covering the top of base flashings), edge metal, pitch pockets, and pipe boots.
Why it matters: More commercial roof leaks originate at flashings than at any other single component. Flashings experience more thermal movement than field membrane and deteriorate faster. Annual inspection of all flashing conditions is the highest-value maintenance activity on any commercial roof.
- Penetration
- Any pipe, conduit, HVAC unit, drain, vent, or structural element that passes through or sits on the roof membrane. Each penetration requires a flashing detail that seals the transition between the membrane and the penetrating element. Penetrations are the most common origination point for commercial roof leaks.
- Parapet wall
- A low wall at the perimeter of a flat roof that extends above the roof deck. Parapets are present on many commercial buildings and require base flashings on the roof side and waterproofing on the cap. The intersection of the roof membrane with the parapet wall is a common failure point on aging systems.
- Drain / roof drain
- A plumbing fixture embedded in the roof surface that directs water into the building's drainage system. Commercial flat roofs typically have multiple interior drains supplemented by scuppers or gutters at the perimeter. Drain bowls, strainers, and collars are all maintenance items that require regular inspection and cleaning.
- Scupper
- An opening in a parapet wall or roof edge that allows water to drain off the roof surface to the exterior. Scuppers provide secondary or primary drainage and must be kept clear of debris. A blocked scupper on a parapet-walled roof can cause rapid ponding during heavy rain events.
- Deck
- The structural substrate to which the roof insulation and membrane are attached. Commercial decks are most commonly steel (corrugated metal), concrete, or wood. Deck condition is the foundational variable in any roofing decision; a compromised deck affects overlay and restoration eligibility and must be repaired before any new system is installed.
Why it matters: Deck damage is the most significant finding in a roof assessment. It is the one condition that changes every other option: when the deck is compromised, restoration, overlay, and standard replacement approaches all require additional scope.
- Insulation (roof insulation)
- The thermal barrier layer installed above the deck and below the membrane. Most commonly polyisocyanurate (polyiso) board. Roof insulation provides energy performance, gives the roof system its designed slope in some applications, and provides the substrate to which the membrane is attached.
- Wet insulation
- Roof insulation that has been saturated by water that has penetrated the membrane. Wet insulation loses its thermal value, adds dead load to the structure, accelerates deck corrosion below, and disqualifies the roof from restoration and overlay options. Wet insulation must be cut out and replaced.
Why it matters: Wet insulation is often invisible from the surface; it requires an infrared scan, nuclear scan, or core cut to identify. It is one of the most important findings in a Roof Assessment because it changes the available options for how the roof can be addressed.
- Remaining service life
- An estimate of how many additional years a roofing system can be expected to perform adequately with standard maintenance. Derived from membrane condition, seam integrity, flashing condition, drainage performance, and material age. A core component of every Roof Assessment we deliver.
- Condition grade
- A standardized score assigned to a roof system based on its current condition relative to expected end-of-life performance. We use a consistent grading framework across every property in a portfolio, so that condition grades on different buildings are directly comparable and can be used to rank replacement priority.
- Capital expenditure forecast (CapEx forecast)
- A multi-year projection of anticipated roofing costs (repairs, maintenance, and replacements) across a property or portfolio. Built from condition grades, remaining service life estimates, and current replacement costs. The primary output of a Capital Planning engagement.
Why it matters: A roofing CapEx forecast is what converts an inspection report into a budget tool. Without it, inspection data is informational rather than actionable at the ownership level.
- Temporary Emergency Repair Program (TERP)
- A flat-rate emergency response service that stops an active roof leak temporarily, documents the repair with before/after photos, and delivers a permanent repair proposal in the same visit. The flat-rate fee is credited toward permanent repairs if ordered within 30 days.
Why it matters: The TERP program is designed to give property managers the problem handled, the documentation to share with ownership, and a permanent repair path, all on a single visit without a surprise invoice.
- Roof Assessment
- A systematic inspection of a roof system that produces a condition grade, remaining service life estimate, deficiency documentation with photos, and a replacement cost forecast. The starting point for capital planning and the entry point for most new client relationships at Roofing Innovations.