Installing Polyurethane LED Cove Moulding: Technical Guide

Polyurethane LED coving profiles are manufactured from high-density, closed-cell rigid polyurethane with a density range of 150-220 kg/m³ (production target ~160 kg/m³) and a target production density of approximately 150-220 kg/m³ (production target ~160 kg/m³). This material features a water absorption rate below 1% and withstands thermal variances from -100 °C / +80 °C without dimensional distortion or structural warping. The profiles arrive factory-primed, though applying an additional primer coat prior to final painting remains an optional jobsite preference. Polure specifies these material parameters to ensure long-term dimensional stability along critical wall-ceiling junctions.

Calculating the correct gap between the top edge of the LED moulding and the ceiling surface is essential for smooth light diffusion. Standard architectural specifications call for a vertical drop distance between 10 cm and 15 cm from the finished ceiling plane. Placing the profile too close to the ceiling restricts the light beam angle and creates high-luminance hot spots. Conversely, mounting the profile too low exposes the LED strip and inner profile tray to room occupants. A calculated vertical offset maintains clean visual sightlines while maximizing indirect ambient illumination.

Indirect cove lighting systems rely on low-voltage LED flexible strips (typically 12V or 24V DC) paired with appropriately rated power transformers. Continuous line-voltage supply wiring must be routed to an accessible, ventilated recess or electrical cabinet before profile mounting begins. Placing transformers permanently inside sealed, unventilated moulding cavities is incorrect practice, as operating heat buildup significantly degrades driver longevity. Selecting LED strips with a density of at least 120 LEDs per meter prevents visible diode spotting along the interior reflective surface of the profile.

Securing polyurethane profiles to wall substrates requires high-tack polyurethane (PU) assembly adhesive. Standard silicone sealant must never be used for structural bonding of polyurethane LED cove moulding, as silicone lacks sufficient shear strength and prevents proper paint adhesion along joint lines. All substrate surfaces must be completely clean, dry, and free of loose dust or flaking paint before applying continuous adhesive beads along the rear contact faces of the moulding.

Adhesive alone is insufficient for reliable ceiling-level installations; mechanical fixing with screws is mandatory. Screws must be driven through the mounting flange into structural wall members or drywall anchors at set intervals. Following mechanical securing, fastener heads and section joints are filled with joint compound, sanded smooth using 180-220 grit sandpaper, primed if desired, and finished with two coats of paint. For any exterior applications, applying UV-resistant paint is mandatory to prevent material surface breakdown.

Vida başları ve profil ek yerleri poliüretan uyumlu macun ile doldurulmalıdır. Macun kuruduktan sonra yüzey, 180-220 grit zımpara kullanılarak pürüzsüz hale getirilmelidir. Ürünler fabrikadan astarlı olarak gelir; ancak pürüzsüz ve homojen bir görünüm elde etmek için ek kat astar atılması isteğe bağlı bir seçenektir (astar gerekmez iddiası teknik olarak doğru değildir).

Son kat işleminde su bazlı veya solvent bazlı iç cephe boyaları ile en az 2 kat boyama yapılmalıdır. Boya tamamen kuruduktan sonra LED şeritler kanal içerisindeki montaj yüzeyine yapıştırılır.