The head lap is designed to be minimum how many inches in length for a strip shingle system?

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Multiple Choice

The head lap is designed to be minimum how many inches in length for a strip shingle system?

Explanation:
The head lap is the amount by which the upper row of shingles overlaps the row below at the top edge of the course. For strip shingles, using a minimum of two inches of head lap ensures the joints in the lower row are fully covered, which helps keep water from seeping behind the shingles and provides some protection against wind lifting. That overlap also gives a little cushion for installation variances and temperature-related expansion and contraction, helping the shingles lay flat and stay sealed over time. While some manufacturers or wind-zone requirements may call for more, two inches is the standard minimum that balances weatherproofing with material efficiency.

The head lap is the amount by which the upper row of shingles overlaps the row below at the top edge of the course. For strip shingles, using a minimum of two inches of head lap ensures the joints in the lower row are fully covered, which helps keep water from seeping behind the shingles and provides some protection against wind lifting. That overlap also gives a little cushion for installation variances and temperature-related expansion and contraction, helping the shingles lay flat and stay sealed over time. While some manufacturers or wind-zone requirements may call for more, two inches is the standard minimum that balances weatherproofing with material efficiency.

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