The answer to 'roof decking curling shingles' is that curling roof shingles are often caused by issues with the roof decking or underlayment. Curling can be a sign of improper ventilation, moisture buildup, or deterioration of the roof deck. This can lead to premature aging and failure of the shingles.
Some common causes include inadequate attic ventilation, improper roof deck installation, water damage, or age-related deterioration of the roof deck. Symptoms include curled, cupped, or buckled shingles that may start to lift at the edges. Solutions can range from repairing or replacing the roof deck to improving ventilation, depending on the root cause.