🏢 EXPANSION JOINTS — WHY DO BUILDINGS NEED THEM?

An expansion joint is a designed separation that accommodates specified movement between parts of a building or structure.

Materials expand, contract, shrink, and move in response to environmental conditions and structural behavior.

🔹 Why Are Expansion Joints Used?

🌡️ To accommodate temperature-related movement.

🧱 To help manage movement between designated building sections.

🏗️ To reduce unwanted restraint between parts of a structure.

💧 To maintain appropriate weatherproofing or waterproofing where required.

🔹 Where Might They Be Used?

- Long building structures.
- Building envelopes and roofs.
- Floors and pavements.
- Other systems requiring designed movement accommodation.

🔹 What Should Be Considered?

📐 Joint location and width.

🧱 Movement capacity.

💧 Weatherproofing and waterstops where required.

🔩 Connections and detailing.

📋 Maintenance requirements.

⚠️ Expansion joints are not interchangeable with construction joints or control joints. Each serves a different purpose and must be detailed for its intended function.

@ETCONp