How Hot Would Blackbody Roof

A system most likely to be found in newly built homes.

How hot would blackbody roof.

The unit of measurement for insulation is called the r value. Analysis has shown that dark roof surfaces may reach temperatures of the order of 230 f in summer and fall a few degrees below the minimum air temperature in winter. The r value measures how well insulation is able to resist heat going through it. Most studies show anywhere from 1 to 5 maximum increase in surface temperature during the sunniest part of the day while at night the surface temperature drops faster than a regularly vented roof.

The bigger the r value the better it will insulate your home. Furthermore even if metals get very hot to the touch they generally cool down much faster than traditional tiles or shingles. The term hot roof is something of a misnomer as the attic space will only be a few degrees warmer than in a traditional roof. If black is your preferred roof color you might think that a black metal roof would absorb more radiant heat since it is dark.

Plus new coating technologies are being developed all the time. The hotter an attic is the more expensive it is to cool the upstairs of a home. This can easily create attic temperatures as high as 125 f. Traditional roofs employing asphalt shingles vented attics and insulation on the floor of the attic can get extremelyhot with surface roofing temperatures reaching up to 190 f during the summer.

Unfortunately the term hot roof is a misnomer as the roof really is not that much hotter than a normal roof. A hot roof is one where there is. Perks of a hot roof. How hot your roof really gets in the summer is a variable you have some control over.

A blackbody with this temperature has its peak at approximately 500 nanometers which is the wavelength of the color yellow. A dark roof absorbs more heat from the sun. These roofs have some pros and cons as explained in the article. It s definitely something to consider when re roofing and in a new construction project and you might be able to take steps to cool things down on the roof you already have.

A blackbody that is twice as hot as the sun about 12000 k would have the peak of its spectrum occur at about 250 nanometers which is in the uv part of the spectrum. A hot roof contains the highest r value because there are no chances for air to leak. It is important therefore to be sure that any proposed roofing system with a dark surface can operate satisfactorily at temperatures varying between 50 and 230 f.