Introduction
For maximum protection and longevity of a roof, the proper coating needs to be
applied. Roof coatings provide an extra layer of defense against UV rays,
moisture, and other environmental factors that can degrade roofing materials
over time. With so many different coating products on the market, it can be
difficult to determine which one is the best choice.
Elastomeric Roof Coatings
Elastomeric coatings are a popular choice for Roofing
Coatings because of their flexibility and durable qualities. These coatings
are made from acrylic or plastic polymers that allow the coating to stretch
without cracking. This elasticity enables the coating to expand and contract
with temperature changes and roof movement. Elastomeric coatings are suitable
for use on almost any type of roofing material including asphalt shingles,
metal, modified bitumen, and concrete tile roofs.
Some key benefits of elastomeric roof coatings include:
- Flexibility to withstand roof flexing and contraction/expansion due to
temperature changes. This helps prevent cracking and peeling.
- High reflectivity which helps reject solar heat gain and lower internal roof
temperatures.
- Breathability which allows moisture vapor to escape from under the roofing
material to prevent damage from moist entrapment.
- Resistance to UV rays, mold and mildew growth.
- Longer lifespan of 10-15 years with proper application and maintenance
compared to 5-8 years for traditional coatings.
- Cost effective solution that extends the life of existing roof surfaces
without requiring full replacement.
Silicone Roof Coatings
Silicone roof coatings are more expensive than elastomeric coatings but provide
additional protection against extreme weather conditions due to their strong
flexibility even at very low temperatures. They have very high reflectivity to
repel heat and are fully waterproof and resistant to staining. Some
disadvantages are their higher cost and longer curing time.
Silicone roof coatings are best suited for roofs in northern climates prone to
extreme cold, large temperature fluctuations, or areas with harsh sun exposure.
Commercial buildings with flat or low-sloped roofs also benefit from silicone
due to its self-leveling properties and resistance to ponding water. The
increased flexibility and reflectivity of silicone can provide an extra 5-10
years of roof life compared to elastomeric coatings.
Cement and Asphalt Roof Coatings
Cement and asphalt roof coatings are cost-effective options made from cement or
asphalt emulsions. They are less flexible than elastomeric or silicone coatings
which makes them more suitable for low-traffic flat commercial roofs versus
steep slopes on homes. Advantages are their affordability while still providing
excellent protection from UV rays, cracking, and erosion. However, they are
more brittle and susceptible to premature failure if the roof undergoes
significant movement. Proper surface preparation and application are critical
with these coating types.
Factors to Consider When Choosing a Roof Coating
Beyond the type of coating, other important factors to evaluate include:
- Roof Material - Compatibility with the existing roof material such as asphalt
shingles, metal, or single-ply membrane. Some coating may void warranties.
- Climate Conditions - Harsh sun, major temperature swings, rain/snow levels
determine flexibility and reflectivity needs.
- Surface Condition - Smoothness, lack of defects, and preparation required
like power washing, patching, or priming before application.
- VOC Content - Volatile organic compound content affects both application and
environmental regulations. Water-based has lowest VOCs.
- Warranty Duration - Length of warranty protection which varies by
manufacturer and product line.
- Price vs Performance - Upfront cost balanced against years of protection,
energy savings, and delayed replacement costs.
- DIY Application or Professional - Skills, time, and safety requirements to
properly handle and apply roof coatings.
With the correct coating for particular roofing material and climate
conditions, building owners can see significantly extended lifespan and
protection for their roof at a fraction of replacement costs. Doing research
into different product options and checking professional references enables the
selection of a high-quality coating suited to the specific roofing needs.
Following manufacturer specifications ensures proper application and warranty
coverage as well. A coating is a smart roof maintenance investment.
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