What is Papercrete? Its Properties, Uses in the construction

Papercrete, coined by inventor Eric Patterson in the 1980s, is a remarkable building material that combines paper pulp, Portland cement, and sometimes additional fibres or additives to create a lightweight, durable, and eco-friendly alternative to traditional construction materials. With a growing emphasis on sustainability and environmentally friendly construction practices, Papercrete has gained popularity for its unique properties and wide range of applications in the construction industry. In this article, we will explore Papercrete in detail, discussing its properties, manufacturing process, and various uses in construction.

Properties of Papercrete

Papercrete offers several compelling properties that make it an attractive choice for construction:

  1. Lightweight: Papercrete is significantly lighter than traditional concrete. Its density can vary depending on the specific mix, but it generally weighs less, which reduces the structural load and transportation costs.
  2. Insulating Properties: Papercrete has excellent insulating properties due to the trapped air within the paper fibres. This makes it an energy-efficient material that can help maintain comfortable building temperatures.
  3. Fire Resistance: When properly mixed and cured, Papercrete can be fire-resistant. The paper fibres char rather than burn, and the cement helps prevent the spread of flames.
  4. Sound Insulation: Its density and composition contribute to good sound insulation properties, making it suitable for reducing building noise.
  5. Workability: Papercrete is easy to work with, similar to traditional concrete. It can be moulded into various shapes and forms, making it versatile for construction projects.
  6. Environmental Friendliness: One of Papercrete’s most significant advantages is its sustainability. It utilizes recycled paper, which reduces waste and requires less energy than conventional concrete.
  7. Durability: Papercrete can have excellent long-term durability when appropriately protected from moisture. It can withstand the test of time and adverse weather conditions.

Manufacturing Process

The manufacturing process of Papercrete involves mixing three primary components: paper pulp, Portland cement, and optional additives. Here’s a step-by-step overview of how Papercrete is typically made:

  1. Collecting and Preparing Paper: First, paper waste, such as newspapers or cardboard, is collected and shredded into small pieces. These pieces are soaked in water to soften and break down the fibres.
  2. Blending with Cement: A mixer combines The softened paper pulp with Portland cement. The exact ratio of paper pulp to cement varies depending on the desired properties of the final product, but a typical mix is around 60-80% paper pulp and 20-40% cement by weight.
  3. Optional Additives: Various additives can be included in the mix to enhance specific properties. Examples include fibreglass or acrylic fibres for increased strength and durability and mineral admixtures for improved insulation.
  4. Mixing and Curing: The mixture is thoroughly mixed until it reaches a homogeneous consistency. After mixing, it is left to cure, typically for several weeks. Curing allows the cement to harden and bond with the paper fibres.
  5. Forming and Shaping: Once the Papercrete is adequately cured, it can be moulded into the desired shapes, such as blocks, panels, or sculptures. It can also be applied as a plaster or stucco.
  6. Protection from Moisture: Proper moisture protection is essential for Papercrete’s durability. This can be achieved through sealing, painting, or applying an exterior finish to prevent water infiltration.

Uses in Construction

Papercrete’s unique properties make it suitable for a wide range of construction applications:

  1. Building Blocks: Papercrete blocks are lightweight and easy to work with, making them ideal for constructing walls. They provide insulation and are more comfortable to handle than traditional concrete blocks.
  2. Insulation: Papercrete’s insulating properties make it an excellent choice for insulating walls and roofs in both residential and commercial buildings, improving energy efficiency.
  3. Structural Panels: Papercrete can create structural panels for walls and roofs. These panels are strong, lightweight, and offer good thermal insulation.
  4. Sculptures and Art Installations: Papercrete is often used for artistic projects and statues due to its malleability and versatility. It can be moulded into intricate shapes and finished to resemble stone or other materials.
  5. Stucco and Plaster: Papercrete can be applied as a stucco or plaster finish on walls, providing insulation and a unique aesthetic. It can also be used to create decorative elements in building exteriors.
  6. DIY Projects: Its ease of use and affordability make Papercrete an excellent choice for do-it-yourself projects such as garden planters, outdoor ovens, and even small structures like sheds.
  7. Emergency Housing: In disaster-prone areas, Papercrete can be used to quickly construct temporary housing due to its lightweight nature and insulating properties.
  8. Green Building Practices: Papercrete aligns with green building practices, as it utilizes recycled materials and reduces the carbon footprint of construction projects.


Papercrete, with its exceptional properties and sustainability benefits, offers a compelling alternative to traditional construction materials. Its lightweight nature, insulating properties, and ease of use make it suitable for a wide range of applications in the construction industry. As society continues to prioritize eco-friendly building practices, Papercrete is likely to play a more prominent role in shaping the future of sustainable construction, contributing to a greener and more efficient built environment.

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