Princeton’s All Straw House

Straw bales have a lot going for them: they’re cheap, they insulate well, and straw is genuinely abundant as a byproduct of farming. But bales have practical limitations when it comes to dimensional precision, detailing, and integration into contemporary building systems.

The team set out to reimagine straw as something more. Their answer was a novel tectonic system using Durra Panel as its primary building material. Cut and stacked into wall assemblies, the compressed straw panels act simultaneously as structure, insulation, and interior finish. Three jobs, one material.

Manufactured using heat and pressure, with no added chemical binders, Durra Panel transforms waste agricultural straw into a dense, durable building material.

The wall assemblies are formed by stacking 111 layers of Durra Panel, with timber ring beams introduced every 22 layers to provide lateral stability. Inside, the layered profile of the compressed straw is left exposed, a smooth, tactile surface that celebrates the material rather than concealing it. Around the walnut sink, Tadelakt plaster is applied directly to the straw to create a waterproof backsplash.

Externally, 33 prefabricated thatch panels form the rainscreen. Each overlaps the one below to shed water naturally, creating a continuous protective coat approximately six to eight inches thick.

The form itself is shaped by the material. The geometry responds to the structural limits of corbelling compressed straw panels and the roof pitch required for effective thatch drainage, allowing walls and roof to read as one continuous assembly. The entire prototype was prefabricated over two months at Princeton’s Architecture Lab before being transported to its site outside Hudson, New York.

Straw is produced in enormous quantities every year as a byproduct of harvesting wheat and other grains, and most of it goes to waste. It’s burned, left to decompose, or simply underutilised. Professor Paul Lewis, one of the project’s principal investigators, noted in an interview with The New York Times that the carbon sequestered annually in straw grown worldwide is roughly equivalent to the total carbon emissions of the global concrete industry.

In a building where straw is doing structural, thermal, and finish work simultaneously, the carbon story stacks up quickly. Every square metre of Durra Panel stores approximately 31 kg of CO₂ captured during the growth of the straw. The material is fast-growing, locally sourced in agricultural regions, and avoids the energy-intensive processing required by many conventional insulation products.

The All Straw House isn’t a finished housing product, it’s a full-scale prototype designed to test and communicate a new construction system, and it’s deliberately legible as one. The team has documented the system carefully, tested the tectonics, and shown that this kind of construction can be prefabricated off-site and assembled with a meaningful degree of precision.

For architects and builders taking biogenic construction seriously, it’s a compelling proof of concept. Straw can perform at a level of material sophistication that goes well beyond what most people picture when they hear the word.

Learn more about the All Straw House at ltlarchitects.com/all-straw-house. To find out how Durra Panel can perform in your next project, get in touch with our team.