Celebrating the Life and Work of Álvaro Siza Vieira

Today, June 25, 2025, Álvaro Siza Vieira celebrates his 92nd birthday. A revolutionary in the field of architecture, Siza’s legacy goes beyond buildings; it shapes our perception, feelings, and experiences of space. 

Born in Matosinhos, Portugal, Siza has long been recognized as a master of restraint. His architecture whispers rather than shouts, respecting the landscape and honoring tradition while simultaneously expressing a deeply contemporary language. His work navigates the interplay of light and shadow, geometry and emotion, simplicity and complexity. 

© "Álvaro Siza Vieira - Arquiteto de Sonhos" Interview

From the Boa Nova Tea House and the Serralves Museum in Portugal to the Iberê Camargo Foundation in Brazil, his projects demonstrate a consistent commitment to timeless design and architectural integrity. Siza has received numerous awards, including the Pritzker Prize (1992), the UIA Gold Medal, and the Golden Lion for Lifetime Achievement at the Venice Architecture Biennale. 

Siza famously stated, “Architects do not invent anything; they transform reality.” For over seven decades, he has embodied this idea, transforming cities and lives through architecture that is as subtle as it is profound. 

At OTIIMA, we share many of the values that define Siza’s work: attention to detail, minimalism with purpose, and architecture that serves people and place. His approach continues to inspire how we think about building and innovation. 

Today, we honor a living legend. May your vision continue to inspire future generations. 

Saint Jacques de la Lande
© João Morgado
Gallery of Saya Park
© Fernando Guerra | FG+SG
Casa de Chá da Boa Nova
© Stefan Costache
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Álvaro Siza Wing | Porto’s Museu Serralves
© Fernando Guerra | FG+SG

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thermal-transmittance

Thermal Transmittance

Uw 1.87 W / m2 K (26mm)
Uw 1.58 W / m2 K (38mm)
Uw 1.07 W / m2 K (54mm)

watertightness

Watertightness

ISO EN 12208 + ISO EN 1027

up to E900 (26mm)
up to E1050 (38mm)
up to E1200 (54mm)
air-permeability

Air permeability

ISO EN 12207 + ISO EN 1026

up to Class 3 (26mm)
up to Class 4 (38mm)
up to Class 4 (54mm)
wind-resistance

Wind resistance

ISO EN 12210 + ISO EN 12211

Class B3 (26mm)
Class C5 (38mm)
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insulation

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ISO EN 10140 + ISO EN 717

up to 42 db
security

Security

ISO EN 1628 + ISO EN 1629 + ISO EN 1630

RC2: (WK2) *1
thermal-transmittance

Thermal Transmittance

Uw 1.56 W / m2 K (38mm)
Uw 1.06 W / m2 K (54mm)
Uw 0.89 W / m2 K (62mm)

watertightness

Watertightness

ISO EN 12208 + ISO EN 1027

up to E1200 (38 mm)
air-permeability

Air permeability

ISO EN 12207 + ISO en 1026

up to Class 4 (38 mm)
wind-resistance

Wind resistance

ISO EN 12210 + ISO EN 12211

Class B5 (38 mm)
insulation

Sound insulation

ISO EN 10140 + ISO EN 717

up to 38 db
security

Security

ISO EN 1628 + ISO EN 1629 + ISO EN 1630

RC2: (WK2) *1
thermal-transmittance

Thermal Transmittance

Uw 1.61 W / m2 K (38mm)
Uw 1.08 W / m2 K (54mm)

watertightness

Watertightness

ISO EN 12208 + ISO EN 1027

up to E1650 (38 mm)
air-permeability

Air permeability

ISO EN 12207 + ISO EN 1026

up to Class 4 (38 mm)
wind-resistance

Wind resistance

ISO EN 12210 + ISO EN 12211

Class C5 (38 mm)
insulation

Sound insulation

ISO EN 10140 + ISO EN 717

up to 40 db
security

Security

ISO EN 1628 + ISO EN 1629 + ISO EN 1630

RC2: (WK2) *1
thermal-transmittance

Thermal Transmittance

Uw 1.55 W / m2 K (38mm)
Uw 1.07 W / m2 K (54mm)

watertightness

Watertightness

ISO EN 12208 + ISO EN 1027

up to Class 8A (38 mm)
up to Class 8A (54mm)
air-permeability

Air permeability

ISO EN 12207 + ISO en 1026

up to Class 3 (38 mm)
up to Class 4 (54mm)
wind-resistance

Wind resistance

ISO EN 12210 + ISO EN 12211

Class B3 (38 mm)
Class C4 (54mm)
insulation

Sound insulation

ISO EN 10140 + ISO EN 717

up to 38 db
security

Security

RC2: (WK2) 2

RC2: (WK2) *1

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