Japanese Non-Firing Technology: A Breakthrough for Absolute Moss Resistance in Nasaki Roof Tiles

In modern architecture and construction, moss and algae growth on roof tiles remains a significant challenge affecting both aesthetics and structural durability. In Vietnam, with its tropical monsoon climate, traditional roofing materials tend to deteriorate after only a few years of use. The introduction of Japanese non-firing technology in Nasaki colored roof tiles has marked a breakthrough, effectively solving the problem of moss resistance and ensuring long-lasting beauty for all roofing systems.

1. The nature of Japanese non-fired tile manufacturing technology

Unlike traditional clay tiles that require high-temperature firing (which generates CO₂ emissions), Nasaki colored tiles are produced using high-pressure hydraulic pressing technology.

This process utilizes a material mixture of cement, fine yellow sand, and reinforcing synthetic fibers. The entire mixture is compressed in steel molds under extremely high pressure (typically reaching 1,500 tons or more). This static pressing process allows material particles to bond tightly, minimizing microscopic voids within the tile structure.

2. Absolute anti-moss mechanism from material structure

To prevent moss growth, two key factors must be eliminated: moisture retention and surface adhesion. Japanese technology optimizes both factors in Nasaki tiles.

Eliminating water absorption
Traditional clay tiles have high water absorption rates (10%–15%), creating a damp environment that allows moss spores to grow from within. Thanks to hydraulic pressing technology, Nasaki tiles achieve a highly dense structure, reducing water absorption to below 7%. Rainwater flows smoothly over the surface without penetrating the tile body, effectively cutting off the moisture source for moss growth.

Smooth surface with anti-adhesion properties
Using precision-engineered steel molds that meet Japanese standards, each Nasaki tile achieves an almost perfectly smooth surface. The absence of micro-cracks or unevenness minimizes dust accumulation and prevents airborne spores from settling—eliminating the primary nutrient source for moss and bacteria.

3. Nano coating system – a superior dual protection layer

The key factor that enables Nasaki tiles to maintain a clean and vibrant appearance for decades is the Nano coating technology. This advanced “wet-on-wet” coating system delivers outstanding properties:

• Strong chemical bonding: Pigment molecules penetrate deeply into the cement structure, forming a highly durable chemical bond that prevents peeling and cracking.

• Lotus-effect self-cleaning: The Nano Silicon layer creates high surface tension, allowing rainwater to wash away dirt easily, keeping the roof clean naturally.

• UV resistance: The coating withstands intense solar radiation, preventing surface oxidation—one of the indirect causes of moss growth.

4. Economic and environmental benefits of Nasaki non-fired tiles

The application of Japanese non-fired technology not only enhances aesthetics but also meets strict economic and environmental standards in 2026:

• Optimal mechanical strength: Nasaki tiles offer superior bending strength compared to conventional tiles, reducing breakage during transportation and installation.

• Eco-friendly production: The non-firing process significantly reduces CO₂ emissions, contributing to sustainable green construction.

• Low maintenance costs: With built-in moss resistance, homeowners save significantly on cleaning and repainting expenses over time.