Galvalume Cool Roof

Lighter color roofs reflect sun s heat much better than darker colors.

Galvalume cool roof.

The main disadvantage of galvalume steel roofing material is the initial cost of the product which is double the cost of a shingled roof. Such a roof can be reasonably expected to be some 50 to 60 degrees cooler than a dark color asphalt shingles roof. During the daylight hours a roof is constantly subjected to solar energy striking its surface. It also takes longer and requires special training to be installed as it can easily dent.

Galvanized and galvalume metal roofs are hot roofs. The mixture of zinc and aluminum protects the galvalume metal against corrosion and rust helping galvalume typically last much longer than galvanized steel. Radiant barriers air spaces and added insullation all helps but nothing improves performance like keeping the heat out of the structure to begin with. Standard or dark roofs can reach temperatures of 150 f or more in the summer sun.

It is a trademarked name but many people use it as a generic term to describe a metal roofing product consisting of steel coil coated with a metal alloy. Painting a bare metal roof with white house paint dramatically improves preformance. Galvalume metal roof and siding panels are coated with a mixture of zinc and aluminum and siliconized coating to help resist scuffs and fingerprints better than a bare metal product. Galvalume steel is best for use in prefabricated metal wall panels and standing seam metal roof applications with concealed fasteners.

Normally galvalume is offered in both bare and pre coated pre painted versions. Cool roof rating council 2435 n. In fact a high end kynar 500 white metal roof is energy star rated and classified as a cool roof by the cool roof rating council. The term solar reflectance is a measure of the amount of that solar energy that is immediately reflected from the surface.

We would not recommend using galvalume panels with exposed fastener steel roofing systems such as corrugated or ribbed steel roofs. Portland or 97217 tel 866 465 2523 email. Galvalume was invented by bethlehem steel in 1972. A cool roof under the same conditions could stay more than 50 f cooler and save energy and money by using less air conditioning.

They have medium relfectivity and poor emissivity 15. Cool roofs can be made of a highly reflective type of paint a sheet covering or highly reflective tiles or shingles.