Eco-Friendly Building Materials: A Complete Guide

Author: Francesca Ciccolella

The construction sector is among those with the greatest environmental impact, particularly in terms of raw material consumption and pollutant emissions generated throughout the life cycle of buildings (we’ve already discussed this here). It is therefore essential to take a different approach to raw materials and resources. Today, we speak of circular construction—a system designed to be self-regenerating, ensuring complete environmental sustainability. Throughout the entire construction process, it is necessary to focus on reducing energy costs, environmental protection, residential well-being, and the use of eco-sustainable building materials—materials that can be transformed into resources, are easily disposed of when they can no longer be used, and have a low environmental impact.

In fact, the choice of technological solutions and construction materials is one of the main causes of environmental pollution; it is therefore necessary to assess the potential impacts of the selected solutions in advance, during the design phase.

Applicable Regulations

Environmental labels are used to verify that materials comply with CAM requirements; these labels provide information on a product’s life cycle, the use of raw materials and energy, CO2 emissions, and possible disposal methods. Environmental labels are classified as public or private and, in turn, may relate to a single environmental factor or be multi-criteria, meaning they refer to a specific number of environmental performance indicators. The main environmental certifications are:

• Type I environmental label (UNI EN ISO 14024): Based on a multi-criteria system that takes into account the product’s entire life cycle, it is voluntary and subject to external certification by an independent body. At the European level, the most widely used is the Ecolabel, which takes into account both the environmental impact of products over their entire life cycle and their quality, as well as their effects on consumer health;
• Type II Environmental Label or Self-Declared Environmental Claim (UNI EN ISO 14021): contains environmental self-declarations by manufacturers, importers, or distributors of products;
• Type III environmental label or EPD – Environmental Product Declarations (UNI EN ISO 14025): provides statements based on established parameters that quantify the environmental impacts associated with the product’s life cycle, as calculated through an LCA study.

Examples of sustainable building materials

Reclaimed wood is a sustainable building material that was previously used in the construction of another structure and, after that structure is demolished, is recycled and used in a new building. It can be used in new construction—especially when large wooden beams are carefully dismantled—or it can be used to make flooring and furniture by transforming the reclaimed wood into laminated wood or plywood.

Cellulose fiber is made from recycled newspaper. Its use as an insulating material helps maintain the breathability of walls while regulating the indoor temperature. In addition, cellulose fiber acts as a humidity buffer: it absorbs some of the moisture on hot, humid days and releases it when the air is drier.

Straw is a byproduct of grain cultivation and therefore requires no additional energy to produce. It is a natural, renewable resource that grows through photosynthesis, using solar energy, water, and minerals from the soil. Straw is a natural building material with excellent insulating properties, both thermally and acoustically; it therefore ensures low heat loss and significant energy savings.

Straw insulation panels are eco-friendly, vapor-permeable, and are produced through a high-temperature, high-pressure extrusion process that does not involve the use of chemical adhesives. They are fire-resistant, can dampen sound waves, are sturdy, and mechanically stable; furthermore, they are 100% recyclable.

Biomattoni are natural building materials produced in our country, the result of experimentation in the construction industry; they are prefabricated blocks made of hemp and lime. Their production requires minimal energy, and they provide excellent thermal and acoustic comfort; they are also resistant to both fire and freezing temperatures.

Furthermore, once the building reaches the end of its useful life, the materials can be reused by breaking them up and remixing them with the addition of lime and water.

Recycled rubber is one of the most innovative materials and can be used to create construction products for a variety of applications. It is resistant to organic agents, temperature fluctuations, and weathering; it also possesses significant elasticity and impact resistance, which make it an excellent acoustic insulator against noise and vibrations.
Its high ability to maintain its performance over time is a significant added value.

Conclusion