“Combo roof waterproofing” typically refers to a combination of various waterproofing materials and techniques used to create a comprehensive and effective waterproofing system for a roof. The primary goal of combo roof waterproofing is to prevent water infiltration and protect the building structure from water damage.
Here’s how the process typically works:
- Surface Preparation: Before applying the foam, the roof surface is cleaned and prepared to ensure proper adhesion. Any existing roofing materials, such as gravel or debris, may need to be removed.
- Foam Application: The polyurethane foam is applied using specialized spray equipment. The foam starts as a liquid mixture of isocyanate and polyol that reacts when mixed and sprayed onto the roof surface. It quickly expands to form a solid layer, creating a seamless, monolithic surface.
- Rubberized Coating: The rubberized coating is typically applied using a roller, brush, or spray equipment, depending on the product’s consistency and the size of the roof. It’s essential to apply the coating evenly and in multiple layers to achieve the desired thickness and coverage.
- Geotextiles Separation Layer: Geotextiles create a separation layer between different components of the roofing system, such as the rubberized coating and underlying insulation or substrate. This separation prevents incompatible materials from coming into direct contact, reducing the risk of chemical reactions, degradation, or bonding issues.
- Leveling and Sloping: One of the primary purposes of adding a screed layer above geotextile is to create a level or sloped surface on the roof. This is particularly important for roofs with low slopes or areas where water drainage needs to be directed towards drains or gutters. The screed layer can be shaped to achieve the desired slope and ensure proper water runoff, preventing pond water and potential leaks.
- Cementitious Topcoat: Cementitious topcoats are formulated to be water-resistant, providing an effective barrier against water infiltration. When properly applied and cured, the topcoat forms a seamless membrane that prevents water from penetrating the roofing system, reducing the risk of leaks and water damage.
Combo Roof System when properly installed and maintained, combo roofing can have a long lifespan, often exceeding 20 years.
