Cove Lighting Profile Selection and Installation Guide

Selecting the correct cove lighting profile requires matching the cross-section dimensions with room height and ceiling proportions. Profiles ranging from 50 mm to 150 mm in height are typically specified based on sightlines and distance from the light drop. In low-ceiling spaces under 2.7 meters, compact profiles prevent visual crowding while maintaining an adequate opening for light distribution.

Technical considerations include the internal projection channel where LED strips and aluminum heat sinks reside. The depth of this channel determines how effectively light disperses across the ceiling surface without revealing individual diode hot spots. Polure recommends selecting profile profiles engineered from rigid polyurethane with a closed-cell structure to avoid warping over extended operational periods.

• Proportion: Use smaller profiles (50-80 mm) for ceilings below 2.7 m.
• Luminance Gap: Maintain a minimum distance of 100 mm to 150 mm from the ceiling line to the top lip of the profile.
• Structural Rigidity: High-density composition prevents sagging over long horizontal spans.

Polyurethane indirect lighting profiles offer superior physical parameters compared to traditional plaster or expanded polystyrene alternatives. High-density rigid polyurethane is manufactured with a closed-cell structure targeting a density of approximately 150-220 kg/m³ (production target ~160 kg/m³) within a allowable production tolerance of 150 to 150-220 kg/m³ (production target ~160 kg/m³). This high mass per unit volume guarantees impact resistance and edge sharp clarity.

Thermal stability ranges from -100 °C / +80 °C, ensuring zero structural degradation caused by heat emitted from continuous-duty LED strip systems. Furthermore, water absorption remains strictly below 1%, making the material resistant to high humidity. For exterior facade installations, using a UV-resistant topcoat paint is mandatory to prevent yellowing or surface chalking under solar radiation.

Precise linear measurement reduces material loss and ensures structural alignment along long wall runs. Measure each wall segment at the exact installation height rather than floor level, as wall lengths frequently vary across vertical elevations due to drywall or masonry tolerances.

When ordering material, add a mandatory waste allowance of 10% to 15% to the net linear perimeter. This additional length covers 45-degree miter corner cuts, pattern alignment, and minor site trims. When calculating corner cuts, verify wall squareness using a digital protractor; wall corners rarely form a perfect 90-degree angle, requiring custom miter adjustments on the compound saw.

Installation begins with thorough surface preparation. The mounting substrate must be completely clean, dry, and free of loose plaster or dust. Profiles are cut to size using a fine-tooth saw blade at precise 45-degree miter angles for internal and external corner joinery.

Adhesion requires specialized application protocols. A continuous bead of polyurethane (PU) assembly adhesive must be applied along all back contact surfaces. The use of standard silicone is strictly forbidden, as silicone lacks structural shear strength and prevents proper paint bonding. In addition to PU adhesive, mechanical fixing with screws is mandatory to anchor the profile permanently to wall studs or substrate anchors.

• Apply PU assembly adhesive evenly along mounting edges.
• Drive screws into pre-drilled counter-sunk holes at designated wall anchoring points.
• Fill joinery gaps and screw heads with polyurethane filler.
• Sand smooth using 180-220 grit sandpaper once fully cured.

Profiles are supplied with a factory-applied primer coat designed to accept architectural paints. While this factory layer provides initial protection, applying an additional primer on site remains optional depending on the specific topcoat paint chemistry and local humidity requirements.

Once mechanical fasteners are set and joint filler has cured, sand all connection points smooth with 180-220 grit sandpaper. Remove all fine dust particles using a tack cloth or vacuum before painting. Apply two complete coats of water-based or solvent-based paint using a brush or fine spray system. For outdoor applications, a specialized UV-resistant topcoat paint must be applied to safeguard the substrate against sunlight exposure.

Avoiding common site mistakes requires verifying material specification and mounting hardware prior to installation. A frequent error is relying solely on adhesive bonds without mechanical screw anchors, which can lead to profile detachment over time due to building movement or thermal expansion.

Ensure that all LED channels accommodate thermal dissipation aluminum tracks before securing the profile to the wall. Polure technical guidelines emphasize checking that no silicone is present on site during installation, verifying substrate moisture levels, and confirming that the profile cross-section provides sufficient clearance for electrical wiring runs.