See martin s comment below as well as the paper i wrote the article about attic ventilation does help mitigate ice dams in cold climates but doesn t help much in hot climates.
Does attic insulation affect shingle blistering.
When attic areas are poorly ventilated excessive heat can cause blisters to form especially on newer roofs.
Spray foam insulation effect on a shingle roof.
The company has said that rash blistering will not affect the intended performance or life of the shingles and that the shingle warranty will not be affected.
Second air temperature and wind movement over and under the roof affect the temperature.
Attic ventilation reduces the average temperature of a roof deck shingle by only 0 5 degrees celsius 0 9 degrees fahrenheit.
Roof slope pitch or angle has the least influence on roof deck temperatures.
See attic condensation cause cure and roof ice dam leaks.
Well the answer to that is yes and no depending on what shingle you have on your roof you may or may not have warranty on your shingles.
An overheated attic combined with moisture can cause a number of problems including damage to roof decking and roofing shingles which can become distorted and deteriorate prematurely.
Atlas roofing does not classify blistering as a manufacturing defect.
If your home has an attic or overhead crawl space heat rising up from below can cause blisters and cracks in asphalt roofing shingles.
The roof absorbs radiant heat from the sun but air flow either wind or attic ventilation has a cooling effect on the roof and helps bring down the overall temperature.
This is not significant enough to cause any damage to shingles.
Roofs with radiant barrier have the potential to lower the temp at night because the radiant barrier prevented the heat loss that would typically occur from the traditional mass insulation on the attic floor rising to heat the roof.
Acute temperatures in uninsulated ventilated attics impact comfort and energy efficiency in living spaces below.
Does spray foam attic insulation void your shingle warranty from your manufacturer.
Heat that s absorbed in the attic can also radiate into the living space causing air conditioners fans refrigerators and other appliances to work harder.
Moisture that gets underneath shingles also has the tendency to create blisters on your roof.
