Which set of measures supports deck ember protection?

• A. Ember-resistant decking; Screen undersides; Maintain a gap between deck and vegetation; All of the above.
• B. Ember-resistant decking; Screen undersides; Maintain a gap between deck and vegetation
• C. Screen undersides; Maintain a gap between deck and vegetation; All of the above
• D. Ember-resistant decking; Screen undersides; All of the above; Maintain a gap between deck and vegetation

Answer: (D)

Protecting a deck from embers relies on a layered approach that combines materials, under-deck protection, and vegetation clearance. Ember-resistant decking reduces the chance that embers landing on the deck surface will ignite the material itself. Screening the underside prevents embers from entering under-deck spaces where they could ignite hidden fuels or bounce back into the structure. Maintaining a gap between the deck and vegetation creates clearance to reduce heat transfer, gives embers room to fall away rather than contact fuels, and makes maintenance easier. Using all three measures together provides multiple lines of defense against ember ignition, covering surface exposure, concealed spaces, and nearby fuels. If any one measure is missing, a vulnerability remains, so the set that includes ember-resistant decking, screening undersides, and a maintained gap addresses the full range of ember risks.