Depending on the type and condition of the roof system, recoating may be an option for extending the life of the roof. Coating costs less than roof replacement, and may provide additional benefits as well. Some benefits obtained from coating a roof can be as follows:
• Extended roof life
• Reduced heat gain
• Aesthetically pleasing
• Prevent water penetration
Coatings may be applied over a variety of properly prepared roof surfaces. Typically applied over foam, coatings may also be applied over roll roofing products such as modified bitumen, PVC (poly-vinyl chloride), TPO (thermoplastic polyolefin), rubber and others, as well as over shingles and even metal.
The process of recoating generally consists of the following:
• Sweep and/or blow loose debris off the roof
• Patch or otherwise repair damaged areas
• Pressure wash to remove adhered debris and dirt
• Prime coat the roof as needed to ensure coating adhesion
• Apply roof coating – may be more than one coat
Due to the time involved at each step in the process, the typical home may require as many as five trips to complete.
Typically foam roofs are restored and maintained with elastomeric coatings. Elastomeric coatings contain elastomers which enable the coating to shrink (with cold) and stretch (with heat) without cracking. They also include titanium to reflect ultra-violet rays from the sun, slowing the rate of deterioration. The primary purpose of elastomeric coatings on foam is to protect the foam from the sun, since ultra-violet rays damage foam.
For best durability, white is the preferred color for an elastomeric coating. However, other lighter colors will also perform well. The darker the color (tint) of the coating, the shorter the life span. Accordingly, it is less costly over time to use the lightest color possible as a roof coating.
Asphalt-based products may be either granulated (like shingles) or smooth. Depending on the condition of the roof system, it may be necessary to prime the roof prior to coating. After patching or replacing damaged areas, a primer may be spray-applied or rolled over the roof surface. Then an elastomeric coating formulated with oil blockers is applied over the roof. The result is a continuous roof surface, with the color tinted as desired.
The primary purpose of elastomeric coatings applied over asphalt products is to extend the life of the roof system, sealing areas where water is entering the structure in the process.
The primary concern with elastomeric coatings is adhesion, or how well the coating sticks to the existing roof system. Adhesion problems are evident when there is sheeting of product, meaning it peels off, or when there is blistering (or bubbles) in the coating. With proper preparation, the chance of adhesion problems is reduced. In cool weather, coatings may not set (dry) as quickly as desired, which can result in cracking due to freezing. Or, rain may come before coatings have set, resulting in coating washing off a roof. In hot weather, the surface of coatings may dry too quickly, sealing moisture underneath, which then causes blistering.
Coatings should be applied only over a clean, dry and solid surface. If moisture is in the existing roof system, coatings will seal that moisture in. Over time, the moisture will rise to the underside of the coating, where it is trapped. With warmth, it will vaporize, resulting in blistering. With cold, it may freeze, forcing the coating to separate from the roof system.
The typical roofing contract is dealt with as follows:
• You contact our office to arrange to have an estimator check your roof and assess the need for work
• Estimator meets with you and checks the roof
• Assuming work is needed, the estimator prepares an estimate for your review and consideration
• Upon signing the estimate, a production manager schedules a time to pre-check the roof to verify the conditions noted by the estimator, as well as to ascertain the materials and any special items of concern to address when work is done
• Work is scheduled and materials ordered (if custom color, etc.)
• Work is performed as noted in The Process above
• A final invoice is prepared and presented, along with warranty documentation
• A final walk is scheduled to verify that work was done to our satisfaction to ensure proper service
Our goal is to provide top quality service to you! For a roofer you can trust, check SUNVEK.
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