Roofers Choice 15 Plastic Roof Cement: Features, Uses, and Application Guide

Plastic roof cements are a staple for quick, durable repairs on flat and low-slope roofs. Roofers Choice 15 Plastic Roof Cement combines high adhesion, flexibility, and water resistance to seal leaks, patch cracks, and protect roof surfaces. This article explains what makes Roofers Choice 15 effective, where it should be used, how to apply it correctly, and best practices for storage, safety, and maintenance. For homeowners and contractors, understanding the product’s capabilities helps ensure long-lasting results and efficient project turnaround.

What Is Plastic Roof Cement

Plastic roof cement is a mastic-like sealant designed for temporary and semi-permanent repairs on roofing materials such as built-up roofs, modified bitumen, shingles, metal seams, and flashing. It remains pliable after curing, providing a waterproof barrier that resists rain and temperature cycling. Roofers Choice 15 is formulated to bond to common roofing substrates, resist ultraviolet exposure, and stay flexible in both hot and cold weather. The product is typically gray or black and thick enough to fill gaps, cracks, and joints while remaining easy to trowel or spread with a putty knife.

Key Features Of Roofers Choice 15

• Excellent Adhesion to asphalt, concrete, metal, and wood substrates, enabling reliable repairs on diverse surfaces.
• Weather Resistance designed to endure sun exposure, rain, and temperature fluctuations without cracking or losing bond.
• Elastic Film remains flexible after cure to accommodate substrate movement and extend repair life.
• Waterproof Sealing protects roof edges, joints, and penetrations from moisture intrusion.
• Ease of Application can be brushed, troweled, or applied with a putty knife, making it suitable for DIY and professional use.

Common Applications And Surfaces

Roofers Choice 15 is commonly used for sealing and patching on low-slope roofs, including built-up roofs (BUR), modified bitumen, and single-ply membranes. It also serves to seal around skylights, vent pipes, and roof penetrations, as well as repairing blisters, minor cracks, and open seams. While it adheres well to metal flashing and galvanized surfaces, a compatible primer may improve initial bonding on very smooth substrates. For patching shingles, ensure the area is clean and dry, and apply a generous coat to ensure a watertight seal. When used on vertical surfaces, apply in a thick bead to prevent sagging and ensure complete coverage.

Application And Curing Process

Prepare the area by cleaning away loose debris, dust, and moisture. For best results, work in dry conditions with temperatures above 40°F (4°C) and not during precipitation. Stir Roofers Choice 15 thoroughly to achieve a uniform consistency. Use a trowel, putty knife, or brush to apply a liberal coat over the repair area, extending several inches beyond the damaged zone. For cracks wider than a quarter inch, apply in multiple layers, allowing each layer to set to a tacky state before adding the next. Tool the surface to create a smooth finish that blends with the surrounding roof. Cure time varies with temperature and humidity, but a typical set is 24 to 48 hours for a durable initial seal. Avoid heavy traffic on the patched area until fully cured.

Safety And Storage

Personal protective equipment should be used when handling roof cement, including gloves and eye protection. Work in a well-ventilated area to minimize inhalation of fumes. Follow the manufacturer’s instructions for storage, ensuring the container is sealed tightly and kept away from heat sources, open flames, and direct sunlight. Store in a cool, dry place away from ignition sources, and keep out of reach of children and pets. If skin contact occurs, wash with soap and water; if irritation persists, seek medical advice. In case of accidental ingestion or inhalation, contact poison control or emergency services immediately.

Tips For Longevity And Maintenance

• Surface Preparation is critical. Clean and dry surfaces before applying Roofers Choice 15 to maximize adhesion and prevent moisture entrapment.
• Layering Strategy for wider cracks involves multiple thin coats rather than one thick application to minimize sagging and cure issues.
• Weather Window choose a dry, moderate-temperature day to apply, avoiding extreme heat or cold that can affect curing time and bond.
• Inspection Schedule inspect repaired areas after heavy rainfall or seasonal changes to identify any new leaks and reapply if necessary.
• Compatibility Check test the cement on a small, inconspicuous area if the roof has unusual substrates or coatings to ensure compatibility.

Choosing And Purchasing Considerations

When selecting Roofers Choice 15 Plastic Roof Cement, consider substrate compatibility, expected climate, and the extent of the repair. For patching large gaps or repairs near critical penetrations, plan for multiple applications and consider pairing with additional flashing or sealant systems for long-term performance. Check the product data sheet for cure times, VOC content, and any recommended primers. Availability from reputable suppliers ensures product quality and consistent performance. If the roof is subject to frequent ponding or standing water, evaluate whether a more robust waterproofing solution is appropriate for long-term resilience.

Verification And Performance

Independent tests and field reports show that plastic roof cements like Roofers Choice 15 provide reliable temporary to semi-permanent sealing for many low-slope roofing systems. The product’s performance is typically rated on adhesion strength, elasticity after cure, weather resistance, and ease of application. For commercial applications, routine inspections should document repair locations, dates, and observed performance to guide maintenance planning. If leaks persist after proper application, consult a roofing professional to assess structural issues, substrate movement, or the need for membrane replacement.

Maintenance Best Practices

Effective roof maintenance complements patching with cement by ensuring drainage, reducing debris buildup, and addressing root causes of leaks. Keep drainage paths clear, monitor flashing integrity, and schedule seasonal inspections. Document repairs and track the aging of patch materials to anticipate refresh cycles. By combining routine maintenance with high-quality roof cement applications, facilities can extend roof life and reduce emergency repairs.

Frequently Asked Questions

• Is Roofers Choice 15 suitable for all roof types? It is designed for many common roofing substrates, but substrate compatibility should be confirmed per the data sheet and, if needed, tested on a small area first.
• How long does curing take? Initial set is typically 24 to 48 hours under normal conditions; full cure can take longer in cooler or humid environments.
• Can it be painted over? Many plastic roof cements can be painted once fully cured, but check the product instructions for compatibility with paints or coatings.