How rice husks are helping protect American homes from wildfires, rot and costly repairs as builders turn farm waste into wood siding alternatives

American homeowners in search of a solution to prevent their houses from suffering damage due to wildfires and costly repair work to exterior surfaces can soon turn to something unexpected instead of the conventional wood siding, namely rice husks, which are removed as part of the harvesting process of the crop. The by-product of agriculture is used in creating sturdy panels that imitate wood but are resistant to water, rot, and fire. This material is already used in housing construction in the US, including California and Utah, as reported by BBC Future.

This is not only an issue of sustainability.

The outside structure needs to remain strong and durable against rain, snow, heat and varying temperatures throughout many years and without the need for constant care. In regions prone to wildfires, the fire resistance factor is also highly valued.


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Rice husk composites attract much attention because they seem to satisfy all these requirements simultaneously.

However, it would be a mistake to say that the material can be used anywhere, as the cost, installation and other factors are of high importance.

Why builders are looking beyond traditional wood siding

The material gained a practical foothold when contractor David Fine was renovating a luxury condominium development in Park City, Utah.

The existing buildings had suffered moisture-related deterioration, while the area’s exposure to wildfires created additional demands on the replacement siding.

The natural look was provided by Cedar, though regular wood raised issues concerning its fire performance. Aluminium was another alternative, but the material could not satisfy the aesthetic needs of the project.

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Fine eventually chose panels manufactured from rice husks. As BBC Future reported, the material offered a wood-like finish alongside properties suited to the development’s challenging conditions.

This is relevant for homeowners who have to make decisions of a similar nature. It is costly to replace the siding of your home, especially if there is moisture damage which necessitates the repairing of the underlying structure as well.

Rice-husk products are also being used beyond residential walls. Manufacturers have developed composite materials for decking, porches and playground equipment, expanding the potential market beyond specialist construction projects.

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The material is not fireproof, however. Its suitability depends on the product’s tested performance, installation and the requirements of local building codes.

BBC Future reported that Modern Mill’s product had met California’s Wildland-Urban Interface fire-safety requirements, an important consideration for construction in areas exposed to wildfire risks.

How discarded rice husks become durable construction panels

This rice husk acts as a protective agent for the grain when it is still attached to the plant by keeping out any moisture or pests. The composition of the rice husk has been very appealing to manufacturing companies seeking alternative building materials.

Instead of using the rice husks as waste material, they are converted to composites that can be processed into various building material forms.

Christopher Guimond, chief executive of US manufacturer Modern Mill, became interested in the material after learning about the environmental problems associated with disposing of rice byproducts.

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The company says it has diverted more than nine million kilograms of rice husks from landfill since its founding in 2018, according to BBC Future’s reporting.

The wider waste problem is substantial.

Annually, huge amounts of rice husk are produced, but some are just burned or allowed to rot. There may be potential in utilising this rice husk as construction materials, hence creating a demand for materials that would otherwise go to waste.

There are other potential uses of rice husk aside from its use as cladding materials. Scientists are studying how rice husk ash can partially replace cement in specific building materials mixtures. It is said that cement production is one of the causes of carbon emissions in the world.

These possibilities should be distinguished from established commercial uses.

Rice-husk siding is already available, while some applications involving ash and structural materials remain under development. Environmental advantages of any specific product are also related to how it was made, how it was delivered, installed, and finally, disposed of.

Could rice-husk siding save homeowners money over time?

This challenge could be the cost involved. According to Fine in an interview with BBC Future, the use of rice husk panels costs slightly more than cedar, but he is positive that as more people learn about them, they will become competitive in the market.

According to Fine, a slightly high price at first might be compensated by the lower need for maintenance. Resisting moisture, rot and sun would mean less repair or replacement of the panels, depending on the buildings and climatic conditions.

It is an interesting suggestion to the potential buyers of this product, but it is still uncertain if there will be any significant savings in the long run. Potential users would have to take into consideration the price of the panels, the labour cost, lifespan, the amount of maintenance and warranty offered.

There would also be a challenge in the building industry, where materials should meet the required codes. Engineers might be reluctant to use untested materials. As Sabbie Miller, the sustainable materials researcher mentioned in a BBC Future interview, stated, it is easier to introduce an unknown material in a non-structural building process than in a structural one.

For the time being, the use of rice-husk composite materials would best be applied to exterior siding and decking projects where the physical properties that have been analyzed would make sense in the context of such use.

From an environmental standpoint, the use of this technology might have some benefits as well; the ability to utilise an environmentally harmful agricultural product and turn it into a usable building material means less waste and another option besides regular lumber and man-made composite products.