Staples are often not recommended for fastening asphalt shingles in areas with high winds because they do not provide the same holding power as nails. In regions prone to strong winds, the risk of shingles being lifted or blown off the roof is significantly increased. Nails create a more secure attachment compared to staples, which can be more easily dislodged under the pressure of gusty conditions. This is especially important for maintaining the integrity of the roofing system and preventing water intrusion.
In contrast, while low temperatures, heavy rainfall, and extreme heat can affect roofing materials, they do not pose the same direct risk to the fastening method as high wind conditions. In colder climates, the materials might become more brittle, but staple fastening are primarily a concern in high wind scenarios due to their lower resistance to being pulled out. Heavy rainfall and extreme heat could affect the lifespan and performance of shingles, but they are not the primary factors affecting the holding capacity of fastening methods under wind stress.