Liquid Membrane vs. Liquid-Applied Technology
The conventional form of liquid roofing uses liquid membrane technology. However, there are projects with restrictive clearances, oddly shaped penetrations and difficult access. In such cases, penetration becomes difficult for even the most flexible liquid membrane. Consequently, a liquid-applied alternative is the best options are the most suitable solution.
How Does Liquid Waterproofing Work?
The operation of these systems is simple. You apply two layers of the coatings using a reinforcing fleece. Since it is liquid, it flows to the extreme inaccessible parts of the roof where it forms a seamless waterproof elastic membrane on curing.
Types of Liquid-Applied Systems
There are two types of roof waterproofing systems; solvent-based coating system, and solvent-free coating system. The former is a moisture curing polyurethane-based coating which is applied in two layers using a reinforcing fleece. Even though it is waterproof, it has high vapour permeability which makes it durable. You can use the solvent-based coating in both new and remodelling projects.
Solvent-free coating system, on the other hand, is an odour-free roof waterproofing system. Just like the sister product, you apply it in conjunction with a reinforcing fleece. It is odourless and therefore suitable for sensitive areas and buildings where fumes from solvent-based products can significantly disrupt the usual routine. Examples include hospitals, schools, offices and public buildings. Nonetheless, it still forms a permanently elastic and a vapour permeable membrane that is tear resistant and durable.
Application of Roof Waterproofing Systems
Most of the liquid systems in the market are installed piece-wise. That is, you apply the base coat then leave it to dry before adding the final coat. The effectiveness of such an application depends on the adhesive strength between the two layers. Such application sometimes fails due to weak bonding, delamination, and contamination.
The application procedure of liquid roof waterproofing systems is ” wet-on-wet.” That is, you apply the top coat while the fleece reinforced base coat is still wet. It allows seamless integration between the different coatings into a single, elastic chemically bonded membrane. Such application eliminates all the risks of failure that are common with the conventional method.
Where to Use Liquid Roofing
You can use this roof waterproofing system in both remodelled and new roofs as exposed membranes. They become especially useful where conventional waterproofing options will not deliver the best result. They are more suitable for areas that experience little foot traffic. However, you can use them in conjunction with other systems designed for heavy traffic areas such as terraces and balconies.
How Long Does It Last?
Most manufacturers offer a comprehensive guarantee of up to 20 years on liquid waterproofing systems. However, this is only valid if the solution is installed by a certified contractor and as per the manufacturer’s guidelines.
The liquid roof coating system is an excellent environmentally-friendly solution for extending roof life and lowering roof maintenance cost. Its “wet-on-wet” application process also reduces significantly the time you need to finish working on the roof. Contact any dealer or manufacturer close to you for additional information and guarantee details.