1. Raw Material Quality (Core Factor)

1. Base material: Fiberglass mat is superior to organic mat, featuring high toughness and anti-rotten performance.
2. Asphalt grade: High-quality modified asphalt resists high temperature softening and low temperature cracking effectively.
3. Surface mineral granules: Ceramic coated granules provide excellent UV resistance, anti-fading and anti-shedding performance.
4. Lamination bonding technology: Firm lamination prevents delamination and bulging.

2. Climatic & Environmental Conditions

1. Long-term strong sunlight and high temperature accelerate asphalt aging and embrittlement.
2. Freeze-thaw cycles cause cracking and warping of shingles.
3. Strong wind and heavy rain erode surface granules and loosen shingles.
4. Acid rain and coastal salt fog corrode shingle surface and shorten service life.
5. Hail impact easily causes hidden cracks and structural damage.

3. Roof Installation Construction

1. Insufficient roof slope leads to poor drainage and long-term water soaking.
2. Unqualified underlayment and loose overlapping cause water backflow erosion.
3. Improper nail quantity, length and specification result in loose fixation.
4. Insufficient overlapping width causes water leakage and internal corrosion.
5. Poor roof ventilation causes high temperature baking and accelerated aging.

4. Daily Maintenance & Usage

1. Accumulated fallen leaves, silt and debris retain moisture and damage shingles.
2. Algae and moss growth corrode shingle surface structure.
3. Random walking on roof causes deformation and invisible cracks.
4. Later roof reconstruction and punching damage waterproof structure.

5. Product Specification & Design

1. Heavier and thicker shingles own better impact resistance and weather resistance.
2. Different grade warranties (30/40/50 years) adopt different production standards.
3. Shingles added with anti-UV and anti-aging additives have longer durability.

6. Auxiliary Accessories Quality

Poor quality ridge caps, valley flashing, edge trim and sealant cause early water leakage, which speeds up overall roof aging.