Upon construction, roof shinglesare installed beginning at a starter course (The edge of the whole roof) at the bottom upward. Each successive row of shingles are laid offset of the row directly below it. This system is designed to redirect rainwater straightly downward without a chance to seep through the seams of the shingles. Some installations incorporate a layering material below the shingles to prevent leak as rainwater could be swayed through the seams by the wind. The underlayment also serves as a material to seal the interior from cold temperature. Today, fire hazard increases significantly, which leads to wood shingles and organic asphalt shingles being less commonly used. In their place, asphalt shingles that are fiberglass-based become much more accepted for installation.
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