In which environment are staples often not recommended for fastening asphalt shingles?

Fastening asphalt shingles with staples is often not recommended in high wind environments due to their tendency to weaken the bond between the shingles and the roof. In conditions with strong winds, staples can fail to hold the shingles securely, resulting in potential damage or lifting of the shingles. This can lead to water intrusion and other issues associated with improper shingle installation.

In contrast, staples may be acceptable in moderate wind conditions, as there is likely less risk of them pulling out compared to high winds. Low temperatures and heavy rain present separate challenges, but they do not specifically correlate to the increased risk of staples failing under wind pressure as high winds do.