Why Does Plastic Roofing Shrink and Expand?

Plastic roof tiles have become an increasingly popular choice for homeowners, thanks to their durability, light weight, and cost-effectiveness. However, some people have reported that these tiles can shrink and expand with changes in temperature, leading to concerns about their long-term performance. So, why do plastic roof tiles behave in this way?

The answer lies in the materials used to manufacture these tiles. One of the most common types of plastic roof tiles is made from PVC (polyvinyl chloride) or its derivative, uPVC (unplasticized PVC). These materials have a high coefficient of thermal expansion, which means they will expand and contract significantly in response to changes in temperature. In hot weather, the tiles may expand, causing them to buckle or warp. In cold weather, they may shrink, leading to gaps or cracks in the roof.

To address this issue, some manufacturers have started adding ASA (acrylonitrile-styrene-acrylate) to their PVC roof tiles. ASA is a type of thermoplastic resin that improves the tiles’ weather resistance and thermal stability. By using ASA-modified PVC, the tiles are less prone to warping, cracking, or discolouration caused by temperature changes. This addition helps to extend the lifespan of the tiles and ensures that their colour remains vibrant for longer.

At our factory, we pride ourselves on being a leading supplier of plastic roof tiles. Our ASAPVC tiles are not only resistant to heat and cold-induced shrinkage and expansion, but also offer excellent insulation and soundproofing properties. They are also highly resistant to corrosion, making them suitable for a wide range of environments. With our commitment to quality and innovation, we continue to provide homeowners with the best and most reliable plastic roof tiles on the market.