Montaje de Cornisas de Techo Paso a Paso

Manual profesional sobre el corte a 45 grados en caja de ingletes, aplicación de adhesivo de doble contacto y sellado elástico de encuentros.

La correcta colocación de cornisas de techo de poliuretano asegura una unión perfecta entre pared y techo sin riesgo de grietas por movimiento del edificio.

Paso 1: Trazado de Guías con Nivel Láser y Herramientas

Step 1: Surface Preparation and Layout Marking — Clean dust, grease, and loose paint from the installation path. Measure down from the ceiling using the profile height dimension and snap a chalk line along the perimeter. Estimated Duration: 20-30 minutes per room. Common Mistake: Installing over dusty or damp substrates without checking if the surface is fully dry and sound.
Step 2: Dry-Fit Measurement and 45-Degree Miter Cutting — Measure corner-to-corner distances and cut 45-degree miter angles on a compound saw with the profile inverted against the fence. Test fit joint ends in place without adhesive. Estimated Duration: 30-45 minutes. Common Mistake: Failing to measure actual corner angles with a protractor, assuming all room corners are perfectly 90 degrees.
Step 3: Polyurethane Adhesive Bead Application — Apply continuous 6 mm beads of polyurethane assembly adhesive along the top and bottom mounting flanges on the reverse side of the profile. Estimated Duration: 15-20 minutes. Common Mistake: Using standard silicone sealant instead of dedicated polyurethane adhesive, which leads to joint failure.
Step 4: Profile Mounting and Mechanical Screw Securing — Press the profile firmly into the wall-ceiling corner along the reference line. Drive countersunk screws through the profile into wall anchors spaced every 40-50 cm. Estimated Duration: 30-60 minutes. Common Mistake: Omitting mandatory mechanical screw fixings and relying solely on adhesive to support profile weight.
Step 5: Joint Putty Application and grano 180-220 Sanding — Fill screw holes and profile butt joints with joint filler. Allow full drying, then sand smooth using grano 180-220 sandpaper. Estimated Duration: 45 minutes (excluding putty drying time). Common Mistake: Sanding with coarse grit under 180, which gouges the factory-primed polyurethane coating.
Step 6: Localized Priming and Two-Coat Paint Finishing — Spot-prime sanded joint areas. Apply two uniform coats of paint over the entire profile length, ensuring UV-resistant paint is selected for exterior projects. Estimated Duration: 1-2 hours (plus coat drying interval). Common Mistake: Applying standard interior paint on exterior installations subject to UV radiation and thermal shifts between -100 °C / +80 °C.

Paso 2: Corte a 45 Grados en Esquinas Interiores y Exteriores

Coloque la moldura de longitud estándar 2400-2440 mm invertida en la caja de ingletes y corte a 45 grados con margen de desperdicio 10% o 15%.

Paso 3: Aplicación del Adhesivo y Fijación en Techo y Pared

Aplique cordones continuos de adhesivo estructural adhesivo de montaje a base de PU en las solapas de apoyo del perfil con densidad 150-220 kg/m³ (objetivo de producción ~160 kg/m³) y presione contra el ángulo de techo. Tiempo de curado: aproximadamente una hora.

Paso 4: Sellado de Juntas y Pintura

Rellene las uniones con masilla acrílica, lije con suavidad grano 180-220 y pinte con la pintura del techo sobre la imprimación de fábrica imprimación acrílica blanca monocomponente en temperaturas -100 °C / +80 °C. Inmune al agua (inferior al 1%).