Installing 3-tab shingles according to manufacturer specifications starts with preparing a clean, dry, and properly nailed roof deck. First, lay an underlayment, usually a self-adhering ice and water shield along the eaves and valleys to prevent leaks. Then, roll out a synthetic or felt underlayment over the entire roof, overlapping strips to provide full coverage. Start at the bottom edge and work your way upward to ensure water sheds properly. Align the starter strip along the eaves—a strip of shingles with tabs cut off—to create a secure edge. When placing the 3-tab shingles, begin at the bottom corner and lay one shingle so the adhesive strip is exposed but not activated yet. Use galvanized roofing nails placed about half an inch above the nailing line, usually four nails per shingle, making sure not to nail too close to the edges to avoid splitting or weak hold. Follow the manufacturer’s guide for precise nail placement to maintain your warranty.
To check your DIY installation, after laying a few rows, use a level or chalk line to see that your shingles are straight and properly staggered. Spacing the shingles with correct exposure — typically about 5 inches — ensures that the tabs overlap correctly, allowing water to shed off the roof efficiently. Watch for proper nail depth; nails should be flush, not overdriven, and all shingles should be flat without curling or buckling. If you notice irregular alignment, excessive nail pops, or shingles that blow off in a strong breeze, call a professional. When hiring a roofer, ask "How do you ensure nail placement meets manufacturer specs to maintain the warranty?" and "Do you provide a written guarantee for workmanship alongside the material warranty?" These questions help ensure your roofing job is done securely and lasts for its intended lifespan.