How are roofing shingles typically installed?

Roofing shingles are typically installed in overlapping rows, beginning at the bottom edge of the roof and progressing upwards. This method ensures that water is effectively directed away from the roof surface, as each row overlaps the one below it, creating a barrier against moisture penetration. The overlapping installation is crucial for maintaining the integrity of the roofing system; it prevents water from seeping under the shingles and causing damage to the underlying structure.

The installation starts at the lowest point of the roof, allowing subsequent shingles to be positioned so that they cover the nails or fasteners of the layer below. This technique not only helps in waterproofing the roof but also enhances its durability and lifespan. The gradual ascent in installation aligns with gravity's role in water drainage, making it an essential practice for effective roofing.