A proper shingle roofing installation requires a sound, dry, and structurally solid roof deck as the base layer, followed by the application of a quality underlayment and ice and water shield along eaves and vulnerable areas. Drip edge flashing must be installed along the roof perimeter before shingles are laid, and step and counter flashing must be properly integrated anywhere the roof meets a vertical surface such as a chimney or wall. Shingles must be fastened according to the manufacturer's specifications — correct nail placement and quantity are critical, particularly in wind-prone areas like Lethbridge — to ensure the roof qualifies for its rated wind resistance warranty. Finally, all penetrations including vents, pipes, and skylights must be properly flashed and sealed to complete a watertight installation.