Plain Coving Selection and Installation Guide for Interiors

Plain coving manufactured from rigid, closed-cell polyurethane offers structural consistency and moisture resistance. The raw material features a density range of 150-220 kg/m³ (production target ~160 kg/m³), with an optimal factory production target of approximately 160 kg/m³. This high-density core ensures resistance to mechanical impact during transit across European logistics routes. With a thermal tolerance between -100 °C and +80 °C and a water absorption rate under 1%, plain coving remains stable in varying European climates, including high-humidity areas. Polure manufactures these profiles with a factory-applied primer coat, though applying an additional primer on site remains optional depending on specific topcoat requirements.

Selecting the appropriate plain coving projection depends directly on room height and wall perimeter length. For standard residential spaces with ceiling heights under 2.6 meters, profiles with a vertical face between 50 mm and 80 mm preserve headroom without overpowering the room visual. In commercial settings or residential interiors exceeding 3.0 meters in height, profiles measuring 100 mm to 150 mm establish a balanced scale. Simple geometric sections fit modern minimalist spaces, whereas wider projection profiles conceal wiring conduits or ceiling settling cracks effectively.

Accurate material procurement requires measuring the room perimeter and calculating miter corner allowances. Measure every wall segment in meters, sum the total linear distance, and add a waste margin based on layout complexity. Straight runs require a standard 10% allowance, while rooms featuring multiple 45-degree or 90-degree internal and external corners require up to 15% extra material. Ordering full-length sections minimizes mid-wall joints, reducing overall thermal expansion movement and simplifying final sanding procedures.

Installing plain coving requires strict adherence to bonding protocols to prevent joint separation over time. Substrates must be thoroughly cleaned, dry, and free of dust or loose plaster prior to installation. Cuts must be executed cleanly using a miter box set precisely to a 45-degree angle. Apply a continuous bead of polyurethane (PU) assembly adhesive along the upper and lower contact edges; silicone adhesives are strictly forbidden as they fail to bond polyurethane permanently. To guarantee structural stability, mechanical fixing with screws is mandatory, securing the profile while the PU adhesive cures completely.

Achieving a seamless joint finish requires systematic surface preparation and proper paint application. After the adhesive cures and mechanical screws are countersunk, fill screw heads and seam joints with fine filler. Sand all filled areas smooth using 180-220 grit sandpaper to create an even surface plane. Apply an optional extra primer coat if specified by the paint system, followed by 2 coats of high-quality topcoat paint. When plain coving profiles are installed on exterior facades or open terraces, applying UV-resistant paint is mandatory to prevent surface degradation from solar exposure.

Avoiding frequent installation mistakes preserves the structural integrity and aesthetic alignment of plain coving. The most frequent failure occurs when installers use silicone instead of dedicated PU assembly adhesives, leading to joint delamination. Another common oversight is omitting mechanical screw fixings, relying solely on surface adhesion. Before finalizing a purchase, verify profile dimensions against wall clearances, inspect packaging integrity for multi-country transport, and confirm ambient jobsite conditions. Choosing certified profiles from suppliers like Polure guarantees consistent cross-sectional geometry across all shipped units.