Step-by-Step Instructions and Pictures for How to Install Asphalt Shingles Properly

By the experts at The Family Handyman
A waterproof roof starts with properly applied drip edge flashing, ice and water shield, roofing felt and a starter course of shingles. Read an overview for how to install asphalt shingles properly.
From The Family Handyman
Installing Asphalt Shingles-Step 1
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Cover the rest of the roof with No. 15 asphalt-saturated felt underlayment (some codes may require No. 30). Each layer overlaps the lower one by at least 2 in. Follow this step by nailing drip edge along rakes (sides of roof), on top of the underlayment. As you did with the flashing, always lap upper pieces over lower pieces. The felt keeps the roof deck dry before shingles go on, protects against wind-driven rain as shingles fail and increases fire resistance.
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