Which option best describes the weather-tight sealing method for panel joints?

• A. Caulking
• B. Wire brushing
• C. Prime painting
• D. Sanding

Answer: (A)

Weather-tight panel joints rely on a flexible sealant that fills the gap and bonds to the joint faces to prevent water and air from getting through while still accommodating movement. Caulking is exactly this type of joint sealant — it cures to a flexible, durable barrier that works well with concrete and tilt-up panels, resisting weathering and allowing for expansion and contraction. The other actions shown aren’t about sealing gaps: wire brushing cleans surfaces, prime painting applies a protective coating but doesn’t seal joints, and sanding smooths surfaces for finishing. So, caulking best describes the weather-tight sealing method for panel joints.