A parapet wall that is too short to provide the required flashing height can create a serious commercial roofing problem. If flashing cannot extend high enough up the wall, water…
A horizontal lifeline system (HLL) is an engineered roof fall-protection system that allows workers to move horizontally across a roof while remaining connected to a continuous safety line. It is…
Routine commercial building maintenance often requires workers to access rooftops for inspections, HVAC servicing, skylight maintenance, gutter work, leak detection, and repairs. Because these activities can place workers near roof…
Commercial roof tear-off projects can create significant risks beyond the roof itself. Falling debris, dust, equipment movement, dumpsters, and material handling activities can damage landscaping, sidewalks, parking areas, building finishes,…
- August 14, 2026
What is the required height for base flashing terminations?
Base flashing is a critical part of a commercial roofing system because it protects the transition between the roof membrane and vertical surfaces such as parapet walls, curbs, equipment supports,…
Condensation is one of the most important moisture-related concerns in a conditioned building. It can occur when warm, moisture-laden air comes into contact with a surface that is colder than…
Coal tar pitch roofing has been used for decades in commercial built-up roofing (BUR) systems because of its durability, waterproofing properties, and resistance to certain chemicals. However, removing older coal…
- August 14, 2026
What does FM Data Sheet 1-28 cover?
FM Global Data Sheet 1-28, currently titled “Wind Design,” provides guidance for designing building components and assemblies to resist wind forces at highly protected buildings, particularly facilities insured or evaluated…
- August 14, 2026
What is the payback difference between R-20 and R-30 in Florida?
For Florida commercial building owners, choosing between R-20 and R-30 roof insulation is ultimately a question of upfront cost versus long-term energy savings. R-30 provides more thermal resistance than R-20,…
- August 14, 2026
What is RoofNav and how is it used during specification?
RoofNav is FM Approvals’ online database and specification tool for selecting FM Approved roofing assemblies, products, and related components. It is widely used by architects, engineers, roofing consultants, contractors, and…