Direct Answer A prescriptive specification tells the contractor what materials, products, components, dimensions, installation methods, and standards must be used. A performance specification tells the contractor what the completed roofing…
- August 14, 2026
What is the internal pressure coefficient (GCpi) and how does it change roof design?
Direct Answer The internal pressure coefficient (GCpi) is a wind-design factor used to account for the pressure that wind can create inside a building when air enters through openings in…
Direct Answer The appropriate safety factor for a tested commercial roof assembly depends on the testing standard, rating system, and whether the published value is a design/allowable resistance or an…
Direct Answer ASD and LRFD are two different structural design approaches used to apply wind pressures to a commercial roof. Allowable Stress Design (ASD) compares service-level design loads with allowable…
- August 14, 2026
How do I write a performance-based roofing specification?
Direct Answer A performance-based roofing specification defines what a commercial roof system must achieve rather than prescribing only a particular brand, membrane, or installation method. The specification should establish measurable…
Direct Answer Rooftop screens and equipment can significantly change the way wind acts on a commercial roof. HVAC units, generators, exhaust fans, solar equipment, pipe racks, mechanical units, equipment screens,…
Direct Answer Penalties for unlicensed roofing activity in Florida can include criminal prosecution, administrative fines of up to $10,000, investigative and legal costs, stop-work or cease-and-desist action, and loss of…
Direct Answer Yes. ASCE 7-22 can change the wind-load design approach for rooftop solar arrays, but the exact impact depends on the array configuration, building geometry, attachment method, site wind…
Direct Answer Effective wind area (EWA) is the area used to determine the wind pressure coefficient applied to a roof component or cladding element under the applicable wind-design standard. For…
- August 14, 2026
Do roof coating applicators need a roofing license in Florida?
Direct Answer In Florida, a roof-coating applicator generally needs to work under the authority of an appropriately licensed contractor when the coating is represented as protecting, repairing, waterproofing, stopping leaks,…