To achieve weather-tight joints between panels, which technique is described?

• A. Sealant tape
• B. Caulking
• C. Butt joints
• D. Epoxy resin

Answer: (B)

Weather-tight joints between panels rely on a flexible sealant that fills the gap and stays elastic to accommodate movement. Caulking is exactly this: a pliable sealant applied along the joint between panels that bonds to concrete and panel surfaces and cures into a durable, watertight bead. Its elasticity lets it absorb thermal expansion, contraction, and minor shifts without cracking, which is essential for keeping wind-driven rain and air out. In Tilt-Up construction, caulking is applied after panels are erected to create a continuous barrier along the joint, often with a backer rod to control the depth of the seal and ensure a clean, durable finish. While sealant tape and epoxy resin have their uses, they don’t match caulking for this specific purpose: tape may lack long-term flexibility and adhesion in this context, and epoxy is too rigid to accommodate panel movement. Butt joints describe the joint type, not the sealing method, so they don’t inherently provide the weather-tight seal.