Roofing Materials Quiz

Thermoplastic Membranes

• Comprised of polymeric materials that can be re-shaped when heated.
• Common types include PVC (Polyvinyl Chloride) and PTFE (Polytetrafluoroethylene).

Tensile Structures Loading

• Loaded in tension, distributing forces along the fabric.
• Each part is subjected to tensile stress rather than compressive or bending loads.

Tension in Pneumatics

• Created by the internal pressure within the inflatable structure.
• Pressure generates a buoyant force, maintaining the shape and stability.

Uncoated Fabrics

• Typically made of woven materials like polyester or nylon.
• Lacks additional protective layers, offering higher breathability and lower weight.

Cable Nets Purpose

• Serve as a supporting framework in membrane structures.
• Distribute loads and provide structural integrity through tension.

Thermoplastic vs. Thermoset Systems

• Thermoplastic membranes can be re-formed and recycled; thermosets cure permanently upon heating.
• Thermosets generally have better chemical resistance but lack flexibility of thermoplastics.

Distinction of ETFE

• ETFE (Ethylene Tetrafluoroethylene) is highly transparent and UV resistant.
• Lightweight and has excellent durability compared to other plastic films.

Defining Characteristic of Tensile Structures

• Characterized by their ability to efficiently transmit and balance loads through tension.
• Utilize flexible materials that can deform under load without failure.

Role of Cable Nets in Membrane Structures

• Provide additional stabilization and load distribution.
• Act as a grid to support various tensioned membrane forms.

Synclastic Surfaces in Membranes

• Defined by surfaces that curve in the same direction in both principal curvatures.
• Result in a double curvature which enhances structural efficiency and aesthetic appeal.