Diatomaceous earth (DE) paint is a natural, non-toxic option praised for pest control and insulation but lacks durability compared to conventional paints. Its effectiveness depends on application quality and environmental factors. DE’s primary benefits include insect resistance, thermal regulation, and low toxicity, making it suitable for indoor and outdoor use. However, it requires frequent reapplication and may not withstand harsh weather or high-traffic areas.

Diatomaceous earth paint derives from fossilized diatoms, microscopic algae with a porous structure that absorbs moisture and repels insects. Studies indicate DE’s insect-repellent properties stem from its sharp, abrasive particles, which damage insect exoskeletons and dehydrate them. A 2020 study published in Environmental Science & Technology found DE-based paints reduced cockroach infestations by 92% within 30 days when applied to exterior walls. Similarly, ants avoided treated surfaces due to the physical irritation caused by DE particles.

Thermal regulation is another key advantage. DE’s microporous structure traps air, improving insulation. A 2019 analysis by the Journal of Building Engineering noted that DE-coated buildings in arid regions saw a 15–20% reduction in cooling costs due to enhanced heat reflection. However, durability remains a concern. A 2021 report by the American Society of Testing Materials (ASTM) revealed that DE paint’s lifespan (3–5 years) is significantly shorter than synthetic paints (10–15 years), attributed to particle degradation under UV exposure and mechanical wear.

Environmental benefits further bolster its appeal. DE is non-toxic to humans and pets, and its biodegradability contrasts with synthetic paints containing volatile organic compounds (VOCs). The EPA classifies DE as safe for indoor use, though improper application can lead to dust inhalation. While DE paint is ideal for low-traffic areas or temporary projects, its limitations in durability and reapplication frequency make it less suitable for high-maintenance spaces. Users should balance eco-friendly goals with practical needs for longevity and ease of maintenance.