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The most important thing to remember when laying shingles is to work from the bottom of the slope to the top. This leaves you with a top overlap that directs runoff from one row to the next until it reaches the eave for disposal. You should also make sure you follow the manufacturer's instructions and the local building code for nailing patterns and frequency so all of your hard work stays put through varying weather conditions.

Metal roofs can last anywhere from 20 to 100 years or more when properly installed and maintained, depending on the metal type. Metal roofs’ longevity are a major benefit and can save you money in repair and replacement costs when compared to asphalt shingle roofs, which have a lifespan of 15 to 30 years on average. 

The cost to install a drip edge on an existing roof runs about $1 to $3 per linear foot, which comes out to between $150 and $1,000, with an average cost of $575. These are just averages; the total project price can vary depending on the type of drip edge chosen and whether you hire a professional for the installation. Factors like roof size, complexity, and labor rates also play a role in determining the final cost.

Skipping the installation of a drip edge can lead to water damage, as it may cause water to seep under the roofing materials, damaging the fascia, soffits, and siding. Over time, this can lead to rot, mold, and deterioration. A missing drip edge also increases the risk of ice dams in colder climates, leading to expensive and tedious repairs.