Westlake Royal™ S4S Trimboard™ PVC moulding is smooth, versatile and durable. Use it to trim and define every type of home exterior in every way imaginable. Its four-sided finished PVC material resists dirt buildup, its Celuka-hybrid process adds durability and its “true square” edges make for cleaner installations. Plus, our S4S Trimboard is backed by a Limited Lifetime Warranty.Our wide array of sizes give you virtually unlimited flexibility to complement, embellish, even transform exterior design. Keep it architecturally correct and match trim to what’s true for each region. Tap into traditional and more extroverted decorative looks.