The Romans were the first to create specifications for their roads using layers of various sized aggregate topped with a course sand for leveling the final layer of stone. Today this method has become an important component of modern pavement systems.
While there are many benefits to permeable paving, the primary benefit is to effectively reduce and manage the quantity of surface water runoff. Water is able to penetrate the surface and naturally filter back into the aquifers in the ground, preventing some pollutants from reaching the aquifer. The joint material should adequately allow the passage of water to quickly drain, possess the structural capability to withstand traffic loads, and provide horizontal stability to the paving surface.
Using stone as a resource in modern construction, we must consider its durability. Paving stone can often be recycled and reused for the same purpose over and over for centuries without the need to be reprocessed.
Porphyry is different from other granites in that as it cooled from a molten state, it split in both vertical and horizontal fissures due to seismic activity. As a result, Porphyry has an even yet textured surface, and due to the hardness of the minerals it contains, porphyry pavers do not become smooth from wear or slippery when wet. Porphyry is an excellent choice for paving outdoor surfaces as it is unaffected by freezing and thawing and highly resistant to chemicals. It is ideal for commercial and residential use because of its durability. This natural stone is aesthetically beautiful and compatible with a wide variety of architectural styles.
Increased concern for safety and durability has led to the adoption of protective surfaces which are easy to repair, have minimal installation and maintenance costs, and offer an economic solution because of its long life cycle. The excellent condition of the many roads and squares throughout the world paved with Porphyry centuries ago is a testament to its low maintenance and long life.