This is a fact so when heat builds up in the rooms below this heat will rise to your attic where it will become trapped.
How much will a dark shingle heat up an attic.
As you ve probably heard from many the color of your roof does affect how much heat is absorbed into your attic.
The fact is ventilation doesn t do much.
If your home has an attic or overhead crawl space heat rising up from below can cause blisters and cracks in asphalt roofing shingles.
However except for reflective coated shingles some energy star rated shingles for instance or white or bare metal there is only about a 10 15 difference in the amount of energy absorbed between black and say a tan or beige and only a few percent between black and a gray red dark blue green or brown.
Or course color isn t the only aspect of your roof that affects home temperature.
The data on the fact that shingle color matters much more than ventilation when it comes to shingle temperatures is much more established than the data on whether hot shingles have a shorter life than cool shingles.
A federal study has shown that the plywood under dark roofs in direct sunlight is consistently 10 to 15 f hotter than the plywood boards under light colored roofs.
Heat from the sun isn t your roof s only enemy.
The roofing material also affects how reflective your roof is.
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.
So your shingles are going to get overheated and possibly even deteriorate faster no matter what the color of your roof is.
Darker colored shingles on the other hand such as charcoal will absorb much of that heat causing the temperature in your attic to rise.
They found that dark shingles are 27 hotter than white shingles.
However during the evening the black shingled roofs also tended to lose heat faster than did the white shingled roofs.
Yes black will be hotter.
When comparing a totally white shingle to a totally black shingle the attic temperature may increase 8 10 degrees.
Also an 8 degree increase in attic temperature does not mean an 8 degree increase in your house.
When attic areas are poorly ventilated excessive heat can cause blisters to form especially on newer roofs.
Interestingly enough during the evening the darker shingled roofs tend to lose heat faster than lighter shingled roofs.
But everyone agrees that dark shingles are hot shingles.
In general lighter colored roofs reflect away heat rays from the sun but dark colored roofs absorb much of that heat and transfer it into the rooms below.
Your attic can become super heated in ways that have little to do with your roof.
However when you get into the grays browns and tans there is only a 2 3 degree difference.
A radiant barrier can help by reducing the amount of that heat that radiates downward.
