Installing shingles over existing shingles, also known as reroofing over shingles, can seem daunting, but with the right preparation and technique, it's a viable and cost-effective way to extend the life of your roof. This comprehensive guide will walk you through the process, highlighting crucial steps to ensure a successful and long-lasting result. Remember: Always prioritize safety and consult local building codes before starting any roofing project.
Assessing Your Existing Roof: The Foundation for Success
Before you even think about laying down new shingles, a thorough inspection of your existing roof is paramount. This is the most crucial step in the entire process.
Inspecting for Damage:
- Check for loose or missing shingles: These need to be repaired or replaced before you begin. Ignoring them will compromise the integrity of your new roof.
- Look for signs of rot or water damage: Soft spots on the plywood sheathing indicate significant problems that need addressing before you can proceed.
- Examine the flashing: Proper flashing around chimneys, vents, and valleys is essential to prevent leaks. Replace any damaged flashing.
- Assess the overall condition of the decking: If the plywood is severely deteriorated, it's best to replace it rather than reroofing over it.
Determining Suitability:
Reroofing over existing shingles is only suitable in certain situations:
- The existing roof is in reasonably good condition: Minor repairs are acceptable, but extensive damage necessitates a complete tear-off.
- The existing roof is structurally sound: The roof deck must be able to support the additional weight of the new shingles.
- Local building codes allow it: Check your local regulations before proceeding. Some areas have restrictions on the number of layers allowed.
Gathering Your Materials and Tools: Preparation is Key
Having the right tools and materials ready before you start is crucial for efficient and safe work. Don't underestimate the importance of this step.
Essential Materials:
- New Asphalt Shingles: Choose shingles that meet your budget and aesthetic preferences.
- Underlayment: This provides an additional layer of protection against moisture.
- Roofing nails: Use galvanized nails specifically designed for asphalt shingles.
- Roofing cement: Use high-quality roofing cement to seal any gaps or cracks.
- Starter shingles: These are crucial for creating a straight and even bottom row.
- Hip and ridge shingles: These are specialized shingles used at the edges of your roof.
- Flashing (if needed): Replace any damaged flashing.
Essential Tools:
- Hammer: A sturdy claw hammer is essential for nailing shingles.
- Utility knife: For cutting shingles and underlayment.
- Measuring tape: Accurate measurements are vital.
- Chalk line: For marking straight lines.
- Ladder: A sturdy ladder that extends well beyond the roofline.
- Safety harness: Essential for working at heights.
- Work gloves: Protect your hands.
- Safety glasses: Protect your eyes from debris.
Installing Shingles Over Shingles: A Step-by-Step Guide
Once your assessment is complete and you have all your materials and tools, you can begin the installation.
Step 1: Preparing the Existing Roof:
Clean the existing roof thoroughly to remove any loose debris, dirt, or moss. Repair any damaged areas.
Step 2: Installing Underlayment:
Lay down the underlayment, overlapping the edges to create a waterproof barrier.
Step 3: Installing Starter Shingles:
Start at the eaves and install starter shingles to create a straight and even bottom row.
Step 4: Installing Shingles:
Begin installing shingles, following the manufacturer's instructions. Ensure proper nail placement and overlap.
Step 5: Installing Hip and Ridge Shingles:
Once the main portion of the roof is complete, install the hip and ridge shingles to seal the edges.
Step 6: Final Inspection and Cleanup:
Inspect your work thoroughly. Repair any issues and clean up any debris.
Safety Precautions: Prioritizing Your Well-being
Working on a roof is inherently dangerous. Always prioritize safety:
- Use a safety harness: This is crucial to prevent falls.
- Work with a partner: Having someone help you is safer.
- Check the weather: Do not work in rain, wind, or extreme heat.
- Wear appropriate safety gear: Safety glasses, gloves, and sturdy footwear are essential.
By following these steps, and prioritizing safety, you can successfully install shingles over existing shingles. Remember, if you are uncomfortable with any aspect of this project, it's always best to consult a professional roofer. A properly installed roof protects your home and your family—don't take shortcuts.
