Charu Chaudhry of Thornton Tomasetti argues that an existing building is already sustainable, so the real job is making it durable for another 100 years. She diagnoses materials and assemblies first and reaches for models only once the problem is defined.

Charu Chaudhry, Associate Principal, Thornton Tomasetti

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In this conversation

How a research invitation right after school took Charu from reinforced concrete to 10th century adobe monasteries in the mountains of India.

Why those adobe buildings, made for a cold and dry climate, have held up through five decades of new rainfall, and what that says about maintained materials.

Her ER approach to an 18th century Manhattan row house that began splaying apart during construction of the tower next door: stabilize first, restore later.

The simple rule she applies to old masonry walls: homogeneity and no voids, because voids give water a place to stay.

Her warning to define the problem before running hygrothermal, finite element or fluid models, or you end up swimming in an ocean of data.

Why she frames decarbonization as a marriage of embodied and operational carbon, and says an existing building needs to be made durable, not sustainable.

When we built, we built for life, and I think that is something that has negatively shifted, in that we tag a lifespan to everything.

Charu Chaudhry

Chapters

From concrete to adobe monasteries

Charu's path from architecture school in India to conserving 10th to 12th century Buddhist monasteries and a master's in architectural conservation.

Materials that outlast expectations

What adobe buildings enduring decades of rainfall teach about maintenance, and why tagging buildings with a lifespan is a step backward.

Restoring by assemblies

A modernist plaza that needed waterproofing and thermal upgrades, and a row house stabilized like a patient in the ER.

Diagnosing without drawings

How laser scans, drone imagery and orthomosaics replace missing drawings, and which analytical tools come next.

Durable, not just sustainable

Embodied versus operational carbon, why incompatible repairs raise both, and why existing buildings resist simple carbon numbers.

What will not change

More AI in data collection and analytics, the same core design principles, and her hope for more science in the conversation.

The principles of all the buildings are actually really simple: it's homogeneity and no voids.

Charu Chaudhry

Takeaways

Chaudhry says adobe monasteries built for dry climates have survived decades of new rainfall, proof that maintained materials outlast expectations.

She breaks restoration into assemblies, and for old masonry the principles are simple: homogeneity and no voids where water can sit.

With no drawings to start from, she relies on laser scans and drone imagery stitched into orthomosaics to diagnose a building.

Define the problem before running hygrothermal, finite element or fluid models, or you end up swimming in an ocean of data.

She sees decarbonization as a marriage of embodied and operational carbon: incompatible repairs cut durability and raise both.

An existing building already is a sustainable endeavor. The endeavor right now is to make it durable so that it can endure another 100 years of its life.

Charu Chaudhry