When designing or renovating a home, roofing is often considered for its durability, design, and insulation properties. However, one lesser-known aspect of roofing is its impact on rainwater pH levels. Since rainwater harvesting is becoming increasingly popular in Kerala and across India, understanding how different roofing materials influence water chemistry is crucial for maintaining water quality.
Why pH Levels in Rainwater Matter
pH is a measure of how acidic or alkaline water is. Neutral water has a pH of around 7. For drinking, irrigation, or storage, keeping harvested rainwater close to neutral is important because:
Highly acidic water (pH < 6) can corrode pipes and leach metals.
Highly alkaline water (pH > 8) can cause scaling, reduce soap effectiveness, and impact plant growth.
Neutral water (pH 6.5 – 7.5) is ideal for most domestic and garden uses.
Your choice of roofing material directly influences whether rainwater tilts acidic, neutral, or alkaline.
Impact of Different Roofing Materials on Rainwater pH
1. Asphalt Roofing Shingles
Asphalt Traditional 3-Tab Roofing Shingles in Kerala are widely used for their affordability and weather resistance. However, they may release trace hydrocarbons and dust into rainwater.
Effect on pH: Typically leans slightly acidic (around pH 6–6.5).
Best Use: Suitable for non-potable applications (flushing, irrigation). Water treatment recommended before drinking use.
2. Architectural Roofing Shingles
Architectural Roofing Shingles in Kerala offer superior durability and layered aesthetics. Premium variants like Dynasty Roofing Shingles are engineered with protective coatings.
Effect on pH: Coatings reduce leaching, keeping rainwater closer to neutral (pH 6.5–7).
Best Use: Safe for both irrigation and household purposes with minimal filtration.
3. Premium Designer Roofing Shingles
Options like Armourshake Roofing Shingles combine durability with luxury aesthetics.
Effect on pH: Coated surfaces minimize contaminants, making rainwater safer and more neutral.
Best Use: Ideal for homes that integrate rainwater harvesting with lifestyle design.
4. Clay Roof Tiles (Tejas Borja Series)
Scaffs India offers imported Spanish tiles such as Borja Tech, Borja Extrem, TB-12, and Alicantina-12.
Effect on pH: Clay tiles are naturally inert, keeping rainwater near neutral (pH 6.8–7.2).
Best Use: Excellent for rainwater harvesting intended for both domestic and garden use.
5. Solar Roof Tiles
Tejas Borja Solar Roof Tiles merge energy efficiency with rainwater management.
Effect on pH: Glass and ceramic surfaces are chemically stable, keeping pH balanced.
Best Use: Eco-homes looking for dual sustainability—clean power + clean water.
Additional Considerations
Roof Accessories: Using high-quality accessory products like ridge caps, underlayment, and waterproofing membranes reduces contamination risk.
Maintenance: Regular cleaning prevents organic buildup (leaves, bird droppings), which can acidify water.
Cottage-Style Roofs: In Kerala, homes with A-frame cottages or wooden cottages often incorporate natural roofing materials, influencing pH differently depending on wood treatments and finishes.
Conclusion
Roofing isn’t just about aesthetics or protection—it shapes the quality of rainwater you harvest. Asphalt shingles may lean acidic, while clay tiles and solar roofs preserve neutrality, making them excellent for potable uses. By choosing high-quality roofing solutions from Scaffs India, you ensure both durability and water quality for your home.
For tailored roofing and water-harvesting solutions, explore Scaffs India’s roofing shingles, premium tiles, and cottage designs, or get in touch via the contact page.