Typically, four steps are needed to properly coat a metal
roof:
All loose coatings, heavy rust,
debris, and fresh roof cement must be removed, and the existing roof system
must be repaired — such as replacing missing or loose fasteners and metal
panels as needed. Then the roof is power-washed at 2000 psi with a cleaner,
using an airless spray rig.
Prime the roof with a metal roof
primer using an airless spray gun followed by a wet film gauge to determine the
proper mil thickness has been applied.
Flash fasteners, penetrations,
seams, and lap joints with a flashing grade sealant that can be brushed, rolled
or extruded.
Apply the finish coating (using the
airless spray gun), followed by the wet film gauge to ensure proper mil
thickness. A typical dry mil thickness for the finish coating is 18-25 dry
mils, achieved in 2-3 coats. The finished coating system serves as the top
layer of the roofing system. This is quite different from a paint film
thickness (approximately 3 dry mils).
Seams, penetrations, and fasteners
are typically treated manually, using a combination of coating, caulking, and
reinforcement. Application of the roof coating is then generally accomplished
by spray, due to efficiency and uniformity issues. Single-package and longer
potlife products may be applied by brush, roller, or a combination of spraying
and back-rolling but usually only on projects of limited size, or where special
considerations or limitations restrict the installation method.
Spray applications methods are best
for metal roofs because of the irregular shapes and joints that must be
covered, although coatings can be applied using brushes or rollers.
Help your customers save money by installing profitable cool roof systems Integrating Conklin's roofing and coatings systems into your business is a win-win for the customer, the community in which you live and work, and for your roofing company:
The customer gets a less expensive, sustainable roofing system that helps them save on their energy costs
White roofs contribute to the reduction of landfill waste and your community's urban heat island
Metal
roofing systems with original factory-applied coatings will experience coatings
degradation due to weathering and are recoated with an appropriate maintenance
coating to restore and extend the life of the roof. Uncoated metal roofing
systems experience galvanic corrosion and are also candidates for roof
lifecycle extension by being coated with a corrosion-inhibiting coating system.
White reflective coatings have the added benefit of a “cool roof” for energy
savings.
When
applied to metal roofing, coatings can perform several important functions,
ranging from aesthetic to weatherproofing. They offer a choice of color,
protection against moisture intrusion, potential energy savings, and structural
enhancement, all at a reasonable cost. And they provide a sustainable,
long-term option to the eventual replacement of leaky, corroded metal panels
that may be covering expensive buildings and their contents.
Metal
thermally expands and contracts. This movement can cause the screw holes to
elongate. A metal roof coating system can be used to address this problem for retrofit and
repair. Metal roofs typically have a good coating when new, but this original
coating can wear out over time, exposing the roof to rusting.
Coatings
can prevent deterioration by providing a “sacrificial” layer to take the
punishment that the elements and the environment dole out. Depending on the
geographical location and building configuration, coatings can reduce energy
consumption and improve building occupant comfort. Reducing hot building
temperatures has been shown to improve productivity. Coatings can waterproof a
leaky roof and also protect the integrity of a metal roof by reducing
thermal-shock roof damage. A cool roof coating moderates the excessive thermal
expansion and contraction that otherwise could lead to fastener and seal
failures.
Help your
customers save money by installing profitable cool roof systems Integrating Conklin's roofing
and coatings systems into your business is a win-win for the customer, the
community in which you live and work, and for your roofing company:
The customer gets a
less expensive, sustainable roofing system that helps them save on their energy
costs
White roofs
contribute to the reduction of landfill waste and your community's urban heat
island
Seams, penetrations, and fasteners
are typically treated manually, using a combination of coating, caulking, and
reinforcement. Application of the roof coating is then generally accomplished
by spray, due to efficiency and uniformity issues. Single-package and longer
potlife products may be applied by brush, roller, or a combination of spraying
and back-rolling but usually only on projects of limited size, or where special
considerations or limitations restrict the installation method.
