Which window feature best contributes to ember resistance in WUI defense?

• A. Grinding or smoothing edges
• B. Tempered or laminated glass
• C. Plastic film
• D. Single-pane glass with no seal

Answer: (B)

Ember resistance hinges on the window’s ability to resist heat, stay intact, and prevent embers from entering the structure. The best option is tempered or laminated glass because tempered glass is heat-treated to withstand higher thermal stresses, making it less likely to crack or fail under ember exposure. Laminated glass adds an interlayer that holds the panes together if a pane does break, which stops embers from penetrating and also reduces radiant heat reaching the interior. These features together provide a more durable barrier against embers than other common window configurations.

Grinding or smoothing edges doesn’t address ember exposure, plastic film can help only modestly and may burn or fail under intense heat, and single-pane glass with no seal offers little protection against embers and heat.