Roof PU Waterproofing
Roof surfaces endure sun, rain, and temperature swings that stress any waterproof layer. Polyurethane waterproofing provides elasticity and crack bridging to maintain a continuous seal across the roof substrate. Thorough surface preparation, including cleaning, drying, and repairing defects, is essential for reliable adhesion. In buildings with rooftop equipment such as boiler actuators, detailing around penetrations prevents moisture from compromising the system.
Two component polyurethane systems offer strong adhesion and fast cure times, while solvent-free formulations reduce odors and VOCs. For flat roofs, using a reinforced membrane layer helps resist mechanical wear and foot traffic. Select a system with appropriate UV resistance and a thickness target of about 1.5 to 2.0 millimeters to balance protection and flexibility.
Application should follow manufacturer guidelines, starting with priming, then reinforcement at corners and penetrations, and finally the topcoat. Use cold spray or rolling methods suited to the substrate, and ensure proper ventilation during cure. Plan for regular inspections after storms and seasonal transitions to catch micro-cracks before water finds a path.
Exterior PU Waterproofing
Exterior walls face moisture, temperature change, and daily wear from sun and rain, making adhesion and film integrity crucial. Polyurethane coatings resist cracking and accommodate movement better than rigid membranes, provided the substrate is sound and dry. Start with a compatible primer, address any efflorescence on masonry, and ensure flashing around openings is watertight. In areas near boiler rooms, protect electrical cabinets and wiring from accidental water ingress by detailing penetrations carefully.
Proper detailing at expansion joints and around pipe penetrations is essential to prevent delamination. Use flexible sealants and corner beads to maintain a continuous film across irregular surfaces. Ensure the coating thickness achieves adequate barrier properties while allowing for thermal movement.
Maintain exterior PU systems with routine washing and periodic re coatings according to climate and wear. Inspect for UV degradation, chalking, and micro cracks after heavy rainfall or freeze thaw cycles. If needed, schedule a recoat before film degradation reaches the substrate, especially on walls adjacent to boiler equipment.
Bathroom PU Coating
Bathroom demand high resistance to humidity, water exposure, and cleaning agents. PU coatings used in wet areas offer excellent water barrier properties and flexibility to handle substrate movement. Prepare the substrate by removing contaminants, sealing cracks, and priming porous surfaces before applying the coating. In settings where boiler actuators or other mechanical equipment are nearby, ensure start times and curing do not trap moisture in control cabinets.
Apply the PU coating with even thickness, typically 1.0 to 1.5 millimeters, and reinforce corners and around drain joints. Avoid inferior primers or unsuitable topcoats that could peel in damp conditions. Use compatible sealants for joints and transitions to prevent water migration behind tiles.
Ventilation is crucial during cure and ongoing after installation to prevent lingering humidity. Clean the surface with non-abrasive cleaners and avoid harsh solvents that can degrade the coating. Schedule routine inspections for cracks, peeling, or discoloration and perform timely recoating to maintain a robust bathroom waterproof layer.