Black Roof Vs White Roof Energy Savings

In fact city councils throughout the country are adopting model codes which favor white over black roof systems touting energy efficiencies without considering key factors that greatly contribute to the actual efficiency and life of a roof.

Black roof vs white roof energy savings.

Find out what the most energy efficient roof color is plus the one thing that makes a much greater difference than roof color. Unfortunately that is only half of the equation. White issue almost non existent. Furthermore the days are much shorter.

White roofs are better than black roofs. For most recorded locations the black shingled roofs were generally 10 f to 15 f warmer than identical white shingled roofs on sunny days. The debate between white roofs versus black roofs has raged on for years however recent science has shown the reflectivity of white roofs has given them the edge. On a hot day a black roof can be as high as 100 degrees warmer than the air temperature while a white roof will only be 20 degrees warmer than air temperature.

This type of coating will have a higher solar reflectance rating than a dark or black roof and may prevent up to 75 of solar heat from entering. Cool roofs can be made of a highly reflective type of paint a sheet covering or highly reflective tiles or shingles. During the hottest months of the year a white roof can significantly decrease your energy usage. Standard or dark roofs can reach temperatures of 150 f or more in the summer sun.

This is where you can really see your energy savings add up. Depending on the thickness of insulation that you install it can make the black vs. The difference is palpable. So the energy savings that many people hope to realize by having a black roof in the winter just isn t ever realized.

Polyisocyanurate poly iso is one of the most recommended types of insulation to be installed on a roof due to its density and high r value. However even if you don t air condition your building you may want it cooler in the summer. Look for an energy star rated roof for maximum energy savings. The 50 year life cycle cost analysis found that even the most inexpensive kind of green roof with no public access and consisting of only sedum or prairie grass costs 7 per square foot more than black roofs over 50 years while white roofs save 2 per square foot compared to black roofs.

A cool roof under the same conditions could stay more than 50 f cooler and save energy and money by using less air conditioning. A study by the united states department of agriculture found that wood roofing panels under black shingles were ten to fifteen degrees warmer than the same panels under white shingles on a sunny day. For many buildings in temperate climates there is no air conditioning and no reduced air conditioning energy benefit for the use of a white roofing system and there is some heating benefit to black roofing in the winter the benefit varies with the amount of sunshine.