How to Apply Deck Flex Elastomeric Roof Coating

Professional application guide for long-lasting roof protection

Deck Flex's Elastomeric Roof Coating is easy-to-apply and will protect and beautify your roof surfaces. In this guide we cover surface preparation, application and maintenance basics. In addition to the step-by-step guide below, we published a short ~3min video on YouTube that goes a little deeper beyond the basics.

What is Elastomeric Roof Coating?

Elastomeric roof coatings are high-performance, rubber-like materials that provide superior protection for various roofing substrates. According to the U.S. Department of Energy, these cool roof coatings can reflect solar energy and reduce cooling costs by up to 15%.

The unique elastomeric properties allow the coating to expand and contract with temperature fluctuations without cracking, making it ideal for climates with extreme weather variations. Learn more about elastomeric coating benefits and how they compare to traditional roofing solutions. For expert elastomeric roof coating recommendations, our technical team can help you select the right product for your specific application.

Suitable Roof Types for Elastomeric Coating

Metal Roofs

Excellent adhesion to galvanized steel, aluminum, and other metal substrates. Prevents rust and corrosion while providing UV protection.

Concrete & Masonry

Seals porous concrete surfaces, preventing water infiltration and freeze-thaw damage common in colder climates.

Built-Up Roofing (BUR)

Restores and extends the life of aging built-up tar and gravel roofs without costly tear-off and replacement.

Single-Ply Membranes

Compatible with EPDM, TPO, and PVC membranes, adding an extra layer of protection and reflectivity.

Note: Always check with the National Roofing Contractors Association or your local building codes for specific requirements in your area.

Tools & Equipment

Pressure Washer
Broom
Industrial Paint Brush or Roller (roller recommended for larger surfaces)
Deck Flex Elastomeric Roof Coating

Benefits of Elastomeric Roof Coatings

Waterproofing Protection

Creates a seamless, flexible membrane that prevents water infiltration and protects against leaks. The elastomeric properties ensure complete coverage without seams or joints where water can penetrate.

UV & Heat Reflection

Reflects up to 90% of UV rays, reducing cooling costs and extending roof life. The highly reflective surface keeps buildings cooler in summer, lowering energy bills and improving interior comfort.

Flexibility & Durability

Expands and contracts with temperature changes without cracking or peeling. This flexibility allows the coating to accommodate building movement and thermal expansion cycles that would damage traditional roof coatings.

Cost-Effective Solution

Extends roof life by 10-15 years while reducing energy costs and maintenance needs. The initial investment pays for itself through avoided roof replacement costs and ongoing energy savings.

Step-by-Step Application Process

Step 1: Prepare Surface
Step 2: Pressure Wash Surface
Step 3: Let Dry (72 Hours)
Step 4: Mask Around Edges
Step 5: Apply Elastomeric Coating (Coverage rate: 100-200 sq ft per gallon, Drying time: 1-4 hours, Recoat time: 24-48 hours)
Step 6: Recoat Roof Surface

Cleaning Surface - Preparation and pressure wash of existing surface

Learn more about what elastomeric coatings are and how they work.

Detailed Application Guide

Surface Preparation

Proper surface preparation is critical for coating adhesion and longevity. Begin by thoroughly cleaning the roof surface to remove all dirt, debris, moss, algae, and loose material.

• Remove all debris with a stiff broom or power washer
• Clean surface with appropriate cleaning solution for your roof type
• Remove rust, loose paint, and failing coatings
• Allow surface to dry completely (24-48 hours minimum)
• Inspect for damage and make necessary repairs

Repair Damage

Address all roof damage before applying the coating. This ensures a sound substrate and prevents future problems.

• Fill cracks and gaps with appropriate sealant or caulk
• Replace damaged flashing and fasteners
• Seal around penetrations (vents, pipes, skylights)
• Ensure proper drainage with no standing water areas

Prime the Surface (If Required)

Depending on your roof type, a primer may be necessary to ensure proper adhesion of the elastomeric coating.

• Check manufacturer specifications for primer requirements
• Apply primer evenly using brush, roller, or sprayer
• Allow primer to dry completely before coating application

Apply First Coat

Apply the first coat of elastomeric coating using proper techniques and tools for optimal coverage.

• Mix coating thoroughly before and during application
• Apply at recommended temperature range (typically 50-90°F)
• Use high-quality roller, brush, or airless sprayer
• Maintain uniform thickness per manufacturer specifications
• Work in manageable sections to maintain wet edge
• Avoid application in direct sunlight or extreme heat

Apply Second Coat

After the first coat has dried completely, apply a second coat for maximum protection and longevity.

• Allow first coat to dry completely (typically 24 hours)
• Inspect first coat for any missed areas or thin spots
• Apply second coat perpendicular to first coat direction
• Ensure complete coverage and uniform thickness

Final Inspection & Curing

Allow proper curing time and perform a thorough inspection to ensure quality results.

• Allow coating to cure completely (typically 7 days)
• Avoid foot traffic during curing period
• Inspect for any missed areas or defects
• Touch up as needed with same coating material
• Document application date for future maintenance planning

Important Application Tips

Check weather forecast before starting - avoid application if rain is expected within 24 hours
Always wear appropriate safety equipment including gloves, eye protection, and non-slip footwear
Store coating materials properly and dispose of waste according to local regulations
Keep detailed records of application including product used, coverage rate, and date applied

Maintenance & Care

To maximize the lifespan of your elastomeric roof coating, perform regular maintenance inspections at least twice per year. Remove debris, clean drainage areas, and inspect for any signs of wear or damage. Address minor issues promptly to prevent larger problems. The EPA recommends proper roof maintenance to prevent water damage and improve building efficiency.

With proper application and regular maintenance, Deck Flex elastomeric roof coatings can provide 10-15 years of reliable protection. Plan for recoating when you notice signs of wear, typically after 10-12 years depending on climate conditions and roof traffic. For additional protective solutions, explore our All-Purpose Protective Sealer for other surfaces.

Common Mistakes to Avoid

Inadequate Surface Preparation

Skipping proper cleaning and preparation is the #1 cause of coating failure. Always thoroughly clean and dry the surface before application. Moisture trapped under the coating will cause blistering and peeling.

Applying in Wrong Weather Conditions

Applying elastomeric coating when rain is forecast, in extreme heat, or when temperatures are outside the recommended range (50-90°F) will compromise adhesion and curing. Check the National Weather Service forecast before starting.

Coating Too Thin or Too Thick

Not following manufacturer specifications for thickness will reduce performance. Too thin provides inadequate protection; too thick causes cracking and extended cure times. Use proper application tools and techniques.

Skipping the Second Coat

A single coat rarely provides adequate protection. Most elastomeric coatings require two coats for full performance. For complete waterproofing, consider our W.M. Waterproofing System.

Ignoring Safety Protocols

Working on roofs is inherently dangerous. Always use proper fall protection, wear appropriate safety gear, and follow OSHA guidelines. Never work alone or in adverse weather conditions.

Frequently Asked Questions

How long does elastomeric roof coating last?

With proper application and maintenance, elastomeric roof coatings typically last 10-15 years. Climate, roof traffic, and maintenance frequency all affect longevity. Regular inspections and prompt repairs extend the coating's life.

Can I apply elastomeric coating over existing coating?

Yes, in most cases you can recoat an existing elastomeric coating if it's still in good condition. The surface must be clean, dry, and free of loose or failing material. If the existing coating is severely degraded, complete removal may be necessary.

How much does elastomeric coating cost per square foot?

Material costs typically range from $0.50-$1.50 per square foot depending on the product and number of coats. Professional installation adds $2-$4 per square foot. DIY application with Deck Flex products can save significantly on labor costs.

What's the difference between elastomeric coating and paint?

Elastomeric coatings are much thicker (10-20 mils vs 2-4 mils for paint) and contain rubber-like polymers that allow them to stretch and contract. They provide superior waterproofing, crack-bridging, and durability compared to standard roof paint. Learn more about choosing the right coating.

Do I need to prime before applying elastomeric coating?

Priming depends on your roof substrate. Porous surfaces like concrete, wood, and unpainted metal typically require primer. Previously painted or coated surfaces may not. Always check the manufacturer's specifications or contact our team for guidance.

Can elastomeric coating stop an existing leak?

Elastomeric coating can seal minor cracks and prevent future leaks, but active leaks should be properly repaired first. Identify and fix the source of water infiltration, allow the area to dry completely, then apply the coating. For severe damage, consider our comprehensive waterproofing systems.

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