Essential Guide to Asphalt Roof Cement: Fast-Track Guide to Choosing and Using Asphalt Roof CementSarah ThompsonSep 09, 2025Table of ContentsTips 1:FAQTable of ContentsTips 1FAQFree Smart Home PlannerAI-Powered smart home design software 2025Home Design for FreeAsphalt roof cement is a staple material in the world of roofing repairs and maintenance, valued for its waterproofing and sealing properties. Whether you're patching minor leaks, adhering shingles, or sealing flashing, asphalt roof cement serves as an effective solution for various roofing issues. This guide will cover its composition, applications, pros and cons, and some design-focused advice for incorporating this material into your roof maintenance routine.What Is Asphalt Roof Cement? Asphalt roof cement, also known as plastic cement or flashing cement, is a thick, bituminous product formulated from asphalt, fibers, and mineral fillers. Its sticky, pliable consistency allows it to adhere to most roofing materials, forming a durable and watertight barrier. You'll find it in most hardware stores and roofing supply outlets, typically sold in trowel-grade tubs or caulking tubes for easy application.Common Uses - Sealing around vents, chimneys, and skylights - Repairing small holes and cracks in shingles or roofing membranes - Tacking down loose shingles - Flashing repairs and sealing - Emergency leak fixesHow to Apply Asphalt Roof Cement Preparation is essential: clean the work area thoroughly to ensure optimal adhesion. Use a trowel or putty knife to apply the cement in a smooth, even layer. For cracks or joints, spread enough material to overlap both sides generously. Allow adequate curing time (usually 24–48 hours), and check for compatibility with your roofing material.Pros and Cons Pros:Excellent waterproofing capabilityEasy to apply and widely availableAdheres to a range of surfaces, including asphalt shingles, metal, and masonryCons:Not suitable for use in very cold or wet conditionsMay dry out or crack over time if exposed to extreme weatherNot meant for large-scale or structural repairsAs a designer, I always consider the long-term integrity of any fix or update. While asphalt roof cement is practical for short-term solutions and minor repairs, I recommend integrating both function and aesthetics when planning roof maintenance or upgrades. If you're drafting a larger renovation that involves reworking your exterior or attic space, consider using a 3D Floor Planner to visualize roofing changes alongside other design updates. This tool allows you to see how roof work will fit into your overall home design, preventing mismatched finishes or awkward architectural details down the line. A holistic approach ensures your roof repairs align with your home's style and structural needs.Tips 1:Always inspect the repaired area after heavy rain or storms to ensure the seal remains watertight. Regular checks and prompt touch-ups with asphalt roof cement can greatly extend the lifespan of your roof.FAQQ: Can I apply asphalt roof cement in wet weather?A: It's best to apply asphalt roof cement on dry surfaces and in mild weather for optimal adhesion and curing.Q: How long does asphalt roof cement last?A: Under normal conditions, repairs can last several years, but exposure to harsh weather may reduce its longevity and require periodic reapplication.Q: Is asphalt roof cement safe for use on all types of roofs?A: While suitable for most asphalt and metal roofing, it may not adhere well to some newer synthetic materials. Always check manufacturer recommendations.Q: How thick should I apply asphalt roof cement?A: A 1/8" to 1/4" thick layer is usually sufficient for sealing most minor cracks and joints. Always feather the edges to prevent water pooling.Q: Can I paint over asphalt roof cement?A: While possible, some paints may not adhere well or could discolor over time. Use coatings designed for asphalt-based products for best results.Home Design for FreePlease check with customer service before testing new feature.