We ve heard this a lot lately.
Black roof vs white roof energy savings.
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.
Standard or dark roofs can reach temperatures of 150 f or more in the summer sun.
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.
For most recorded locations the black shingled roofs were generally 10 f to 15 f warmer than identical white shingled roofs on sunny days.
Of course living in a cold weather climate it is safe to say that for much of the winter the roof is white anyway because of snowfall.
By reflecting up to 88 of the sun s energy duro last s white membranes can greatly reduce energy consumption and costs making it an ideal energy efficient cool roofing solution.
This is where you can really see your energy savings add up.
Cool roofs can be made of a highly reflective type of paint a sheet covering or highly reflective tiles or shingles.
However even if you don t air condition your building you may want it cooler in the summer.
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.
White roofs are better than black roofs.
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.
So the energy savings that many people hope to realize by having a black roof in the winter just isn t ever realized.
Furthermore the days are much shorter.
Unfortunately that is only half of the equation.
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.
The difference is palpable.
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.
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.
A cool roof under the same conditions could stay more than 50 f cooler and save energy and money by using less air conditioning.
White issue almost non existent.
Look for an energy star rated roof for maximum energy savings.
Depending on the thickness of insulation that you install it can make the black vs.
