Why Do Dark Roofs Get So Hot?Ever notice when you move across a blacktop parking lot that it is significantly hotter than when you walk across concrete or grass? Blacktop parking lots tend to get hotter because dark surfaces absorb light (and heat). Like dark-colored paving materials, dark-colored roofs also absorb light – up to 90 percent of the sun's rays which means more heat in both the atmosphere and in your home.
So, How Hot Does It Get?Depending on the roofing materials, your roof could experience in 90-degree conditions temperatures like this:
• Black asphalt roof - 140 to 190 degrees
• Unpainted metal roof - 140 to 150 degrees
• Painted metal roof - 105 to 115 degrees
• White or lighter-colored roofing materials 102 to 120 degrees
These are just temperatures in 90-degree conditions, and as we know, it gets much hotter in the DFW area!
Does This Really Matter to My Roof?You may think that it really does not matter how hot it gets on your roof because you probably never go on your roof. While this is likely true, the interior of your home is affected by the temperatures on your roof. Remember what we said when we mentioned that black asphalt absorbs a large percentage of the sun's rays and converts them into heat? This heat does not just go into the atmosphere, it goes into your attic, and if your insulation is non-existent or not in the best shape, it means rising temperatures and increased cooling costs.
The sun's rays can also damage your shingles and other components of your roof, which means faster wear and tear and a shorter shelf life of your roof.