As the demand for energy-efficient building products increases, metal roofs are being praised for their long-term cost-cutting potential. Although solar-reflective coatings for roofs have been instrumental in reducing energy costs, a study funded by the U.S. Department of Energy and conducted by the Oak Ridge National Laboratory highlights another reason why metal roofs promote energy efficiency.
The study included field testing of an asphalt shingle roof and a stone-coated metal shake roof that had comparable thermal-emittance and solar-reflectance qualities. The asphalt shingles, however, were nailed directly to the roof deck with no air space below. The metal shake roofing was attached with a batten/counter-batten system that allowed airflow underneath. Researchers found a 45% reduction in the flow of heat with the metal roof, mostly attributable to the ventilation above the sheathing.
In cool weather conditions, direct-nailed asphalt shingle roofs result in significantly larger heat loss from attics because the air gap under a metal roof seems to offer insulating qualities that reduce heat transfer. The study also finds an up to 25% reduction in annual cooling costs because much less heat is transferred from the roof to the interior when the roof has sufficient airflow underneath.
High-performance Valspar metal roof coatings combined with a batten or counter-batten system can help reduce both operating and maintenance costs. As the demand for energy-efficient and durable building products grows, we are rising to the challenge.
More from Author
Jeff Alexander | Mar 19, 2019
Green innovation in the construction industry
Although individual companies can make a difference, collaboration is crucial for creating the most significant impact.
Jeff Alexander | Aug 17, 2018
Anti-graffiti coatings keep projects pristine
The Sherwin-Williams Coil Coating products you know and trust are designed to keep your buildings beautiful and free of graffiti.
Jeff Alexander | Aug 7, 2018
8330 On the River
A housing community offering beautiful views of the Detroit River and Belle Isle as the city's waterfront is undergoing dramatic restoration.
Jeff Alexander | Jul 31, 2018
Color trends: Hit pause
Color has the power to help us go within and reset.
Jeff Alexander | Jul 24, 2018
Metal roofs take the residential market by storm
As metal roofing soars in popularity, so do the aesthetic options.
Jeff Alexander | Jan 15, 2018
Metalescent coatings bring shimmer to projects
Achieve a vibrant, metallic finish with only two coats
Jeff Alexander | Dec 28, 2017
Cool coatings reduce heat islands
Innovative products can help lower energy costs and mitigate the heat island effect
Jeff Alexander | Dec 19, 2017
Which Fluropon coating is best for your next project?
Energy efficiency is a top priority to lower operating costs and protect the environment.
Jeff Alexander | Dec 13, 2017
Why are Valspar’s 70% PVDF coatings world famous?
Our two-coat formulation of fluoropolymer resin ensures exceptional color and durability in a variety of climates.