When inspecting asphalt shingles, why is it important to check for shading?

When inspecting asphalt shingles, checking for shading is crucial because it relates directly to bonding issues that can arise in the roofing material. Shading occurs when some shingles are installed in areas that receive less sunlight than others. This can lead to uneven heating and resultant thermal expansion and contraction of the materials.

If shingles are not properly bonded due to these thermal stresses, they can start to lift or curl, compromising their effectiveness. This not only affects the aesthetic quality of the roof but can also lead to leaks and further damage if the shingles cannot adequately adhere to the roof deck. Therefore, identifying shading is critical for ensuring that the shingles will perform as intended and maintain their integrity over time.