When roof pitches exceed which value does the weight of the shingle alone may not fully bond the adhesive strips?

The correct choice is based on the understanding of shingle performance on roofs with varying pitches. When roof pitches exceed a 4/12 slope, gravity plays a significant role in the behavior of roofing materials. At pitches steeper than this, the weight of the shingles alone is often insufficient to press the adhesive strips tightly enough to ensure proper bonding.

As the pitch increases, the angle becomes steeper, which can prevent the shingles from laying flat against the roof surface. This can lead to inadequate adhesion, as the design of the shingle may not allow for optimal sealing against wind and moisture infiltration. Therefore, specific installation techniques or adhesives may become more critical to ensure a secure bond in those conditions, emphasizing the importance of proper installation practices, especially on steeper roofs where the risk of the shingle lifting or becoming dislodged is greater.

Other options represent lesser pitches where the shingles typically maintain better contact and adhesion with the underlying roof surface, thus making their performance in terms of bonding more reliable.