Are CAILIN Stone Coated Metal Roofs Noisy During Rain?

The noise generated by a metal roof during rainfall is primarily tied to its material and structure. Metal roofs have high density and elastic modulus, which means they tend to deform and absorb energy when subjected to external forces (like raindrops hitting the surface). From an acoustic perspective, when raindrops strike a metal surface, their kinetic energy quickly converts into sound waves rather than being dissipated by tiny pores or fibrous structures within the material. Additionally, metal has a much higher acoustic impedance than air, leading to more efficient sound wave reflection off its surface. This high reflectivity makes the impact sound not only audible but also prone to overlapping in a short time, creating continuous noise. For example, clapping your hands in an empty room causes the sound to bounce off walls and floors repeatedly until it fades. Moreover, metal’s high surface tension causes raindrops to bounce off quickly rather than penetrating or lingering as they would on porous materials, further increasing the sound energy released with each impact. This means that a smooth metal sheet roof—like those used on barns or sheds—will amplify the sound of raindrops as it reverberates, making it noticeably louder. In contrast, coated and textured metal roofs, such as CAILIN stone coated metal roofing, effectively absorb the noise from rain impact.

CAILIN stone coated metal roofing stands apart from traditional metal roofs due to its innovative design. It incorporates a multi-layer structure, particularly the stone coating on the surface, which significantly reduces the noise generated by raindrops. This noise reduction stems from several key features:

Multi-Layer Composite Structure
CAILIN stone coated metal roofing consists of a metal substrate, corrosion-resistant aluminum-zinc coating, acrylic resin basecoat, basalt stone granules, and an acrylic resin topcoat. This multi-layer construction not only increases the roof’s overall thickness but also creates a "damping effect" for sound waves, effectively absorbing and dispersing the energy from raindrop impacts.

Stone Coating
The stone-coated surface features irregular granules that scatter the force of raindrops upon impact, reducing the instantaneous noise produced by direct hits. Compared to smooth metal surfaces, the stone coating disperses the kinetic energy of raindrops in multiple directions, significantly lowering noise intensity.