Asphalt sealcoating is a vital maintenance procedure for preserving asphalt pavements, extending their lifespan, and enhancing their appearance. Here’s a detailed overview of the process, its benefits, and considerations:
What is Asphalt Sealcoating?
Asphalt sealcoating involves applying a protective sealant layer over asphalt pavements to shield them from damage caused by water, oils, chemicals, and UV radiation. This coating is typically made from either coal tar pitch, asphalt emulsion, or acrylics, each offering different benefits and suitabilities depending on the environment and use case.
Benefits of Sealcoating
Extended Pavement Lifespan: Sealcoating prevents the oxidation of asphalt and stops weather damage, thereby slowing down the aging process and avoiding costly repairs.
Moisture Barrier: The sealcoat acts as a barrier against water penetration, reducing the risk of potholes, cracks, and other damage caused by water infiltration.
Improved Appearance: Fresh sealcoating gives asphalt a deep, rich black finish, which improves the overall look of the area it covers.
Increased Safety: By filling surface damage and providing a smooth, even surface, sealcoating can improve the safety of the pavement for vehicles and pedestrians.
How Sealcoating is Applied
Surface Preparation: Before sealcoating, the asphalt must be thoroughly cleaned to remove dirt, debris, and any existing damage should be repaired, such as filling cracks.
Application: Sealcoating can be applied using a squeegee, brush, or spray techniques. The choice of application method depends on the project size and specific conditions of the pavement.
Curing Time: After application, the sealcoat requires a curing period, during which the pavement should not be used. This typically takes at least 24 hours in optimal weather conditions.
Considerations for Sealcoating
Weather Conditions: Sealcoating should only be performed in dry weather with temperatures above 50°F (10°C) to ensure proper adhesion and curing.
Frequency of Application: Generally, asphalt should be resealed every two to three years, but this can vary based on the level of traffic, local climate, and the specific type of sealant used.
Environmental Impact: Some types of sealcoat, particularly those based on coal tar, can have harmful environmental and health impacts due to their high levels of polycyclic aromatic hydrocarbons (PAHs). Alternatives like asphalt emulsion and acrylic-based sealers offer more environmentally friendly options.
Sealcoating is an essential part of asphalt maintenance that not only protects but also prolongs the life of pavement surfaces. By regularly applying sealcoat, property owners can save significant money on repairs and replacements, keep their pavements safe and attractive, and ensure a good first impression for visitors or clients. Always consult with a professional pavement maintenance provider to select the appropriate product and schedule for optimal results.