What are Facade Systems and Materials?
A facade system is the engineered outer skin of a building — the structural and material assembly that controls weather, light, air and heat exchange between inside and outside. Choosing the right system and materials shapes a building's energy use, appearance and durability.
Facade systems are the technical assemblies (curtain wall, rainscreen/ventilated cladding, precast panel, masonry veneer) that clad a building's structure, chosen for their weatherproofing, thermal performance, aesthetics and how they attach to the frame.
- •Glass/aluminum grid hung off the frame
- •Carries only its own weight and wind load
- •High transparency, prefabricated units
- •Needs continuous sealant joints
- •Outer cladding + air cavity + insulation + backup wall
- •Cavity drains water and ventilates moisture
- •Pressure-equalized rain protection
- •Wide material choice: metal, stone, terracotta, fiber cement
Try it: interactive calculator
Step-by-step worked examples
A facade has 200 m² of glazing on a total facade area of 500 m². Find the window-to-wall ratio (WWR).
WWR = (Ag/Aw) × 100 = (200/500) × 100 = 40%.
An office tower has 900 m² glazing on 1200 m² total facade. Is this a high-WWR (glassy) or low-WWR facade?
WWR = (900/1200) × 100 = 75% 75% is a high-WWR (heavily glazed) curtain wall facade.
A masonry building has WWR = 20% and total facade area of 800 m². Find the glazing area.
WWR = (Ag/Aw) × 100 → Ag = (WWR/100) × Aw Ag = 0.20 × 800 = 160 m² of glazing.
Flashcards
Quick quiz
Q1.A facade has 150 m² glazing on 300 m² total area. What is the WWR?
Q2.What is a defining feature of a curtain wall system?
Q3.What is the main advantage of a rainscreen (ventilated) facade?
Q4.A very high WWR (e.g., 90%) generally increases…
The full card deck, worked steps and AI-tutor support for “What are Facade Systems and Materials?” are in Notek — study by hand before your exam.
Common mistakes
Assuming all glass facades are curtain walls. — Correct: Glass facades can be curtain wall, window wall or storefront systems — each attaches to the structure differently.
Choosing facade materials on looks alone. — Correct: Thermal performance, weatherproofing, weight and maintenance matter as much as appearance.
Believing higher WWR always means a better building. — Correct: Very high WWR increases solar heat gain and glare risk, raising cooling loads unless shading/glazing is optimized.
Thinking a rainscreen cavity is just decorative. — Correct: The ventilated cavity is functional — it equalizes air pressure and drains/evaporates moisture that gets past the outer layer.
FAQ
What are facade systems and materials?
Facade systems are the engineered assemblies (curtain wall, rainscreen, precast, masonry) and materials that form a building's exterior skin.
What is the window-to-wall ratio formula?
WWR = (glazing area / total facade area) × 100, expressed as a percentage.
How do you calculate window-to-wall ratio?
Divide the glazing area by the total facade area and multiply by 100.
What are examples of facade systems?
Curtain wall, rainscreen/ventilated cladding, precast concrete panels, masonry veneer, and window wall systems.