Which of the following is a common method to achieve weather tightness in panel joints?

• A. Gaskets
• B. Caulking
• C. Sealing paint
• D. Screws only

Answer: (B)

Weather tightness in panel joints is achieved by filling and sealing the gap with a flexible sealant. Caulking uses a polyurethane or silicone sealant (often with a backer rod) that stays elastic, so it can accommodate movement from temperature changes and loads while forming a continuous barrier against air and water. Gaskets aren’t universally reliable for tilt-up panel joints due to irregular shapes and movement, sealing paint doesn’t seal the interior joint, and screws alone don’t prevent infiltration since they don’t close the gap.