This guide is for waterproofing contractors, procurement engineers, distributors, and project buyers who are comparing liquid-applied membranes and want to understand where PU waterproofing coating fits. If you are sourcing material for roofs, wet rooms, basements, or complex structures with many penetrations, this article should help you shape a clearer inquiry and avoid ordering the wrong specification.
Polyurethane (PU) coating is a liquid-applied system that cures into a continuous elastic film. Because it is brushed, rolled, or sprayed, it follows irregular shapes without laps. That makes it useful in situations where sheet membranes are difficult to detail. This guide focuses on selection logic and export communication rather than promising specific performance figures.
FAQ
Is single-component or two-component PU coating better for my project?
It depends on scale and site conditions. Single-component products are convenient for smaller areas and repair work because they need no mixing. Two-component products are often chosen for larger or thicker applications where controlled cure and higher build are needed. Confirm your area, thickness target, and available labor before deciding.
Can PU waterproofing coating be applied on damp or green concrete?
Many PU systems require a dry, cured substrate and good adhesion conditions, and moisture can cause bubbling or poor bonding. Substrate moisture tolerance varies by product, so you should confirm the required substrate condition and any primer requirement for your specific climate and schedule.
How much coating do I need per square meter?
Consumption depends on the target dry film thickness, substrate roughness, and number of coats. Rather than assuming a single figure, share your area, desired thickness, and substrate type so consumption can be estimated for your project.
How is PU coating packed for export?
It is typically supplied in pails or drums, with packing size and pallet configuration depending on quantity and destination. Confirm net weight per unit, units per pallet, and container loading with your supplier, along with any shelf-life and storage-temperature requirements for the shipping route.
Can I use PU coating together with a sheet membrane?
Yes, liquid coatings are often used to reinforce joints, penetrations, and detailing around a membrane system. Compatibility between the coating and the membrane should be confirmed before combining products so the two layers bond correctly.
Does PU coating need protection after curing?
On trafficked or exposed areas, a protective screed, tiles, or a topcoat may be recommended to guard against mechanical damage and UV exposure. Requirements depend on whether the surface is exposed or covered, so confirm the intended finish for your application.
