When a roof needs replacement, homeowners often face a big decision: Should you remove the old shingles first or simply install a new layer on top? This practice—known as roof overlaying—is common in some regions because it seems faster and cheaper. But installing multiple layers of shingles has both benefits and drawbacks.
At Scaffs India, we help clients choose the right roofing shingles in Kerala based on durability, cost-effectiveness, and long-term performance. Here’s what you need to know before deciding on multiple shingle layers.
✅ Pros of Installing Multiple Shingle Layers
1. Lower Upfront Cost
Skipping the removal of old shingles reduces labor and disposal costs. This makes it attractive for homeowners looking for a budget-friendly solution.
2. Faster Installation
Overlaying requires less time compared to a complete tear-off. If you need a quick fix before the monsoon, this can save valuable days.
3. Added Insulation
Extra layers can slightly improve insulation, reducing heat transfer into the home. This may provide minor energy savings in both hot and cold weather.
4. Short-Term Aesthetic Upgrade
If your roof looks worn out but still has structural strength, adding a fresh layer of architectural shingles can restore its appearance.
❌ Cons of Installing Multiple Shingle Layers
1. Excess Weight on Roof Structure
Shingles are heavy. Adding another layer can strain rafters and decking, especially in older homes. Over time, this may cause sagging or structural damage.
2. Hidden Roof Damage
Covering old shingles can mask problems like rotting wood, leaks, or poor ventilation. These hidden issues worsen over time and may lead to costly repairs.
3. Reduced Lifespan
An overlay doesn’t last as long as a full tear-off and replacement. The underlying shingles trap heat, causing the new layer to age prematurely.
4. Difficult Future Repairs
If you need roof maintenance later, repairing multiple layers is more complicated. Future replacements will also cost more since both layers must be removed.
5. Warranty Concerns
Many premium shingles like Armourshake Designer Shingles or Dynasty Roofing Shingles require single-layer installation for full manufacturer warranties.
🏠 Best Practice: When to Consider Multiple Layers
If the old shingles are flat and in fair condition.
If the roof structure is strong enough to handle extra weight.
If you need a short-term solution rather than a long-term investment.
But if the roof deck is damaged or you want a roof that lasts decades, a complete tear-off with new shingles is the smarter choice.
✅ Scaffs India’s Recommendation
For Kerala’s heavy monsoon rains, wind-driven storms, and humidity, we recommend a single-layer installation using high-performance shingles. Options include:
3-Tab Asphalt Shingles for cost-effectiveness.
Architectural Shingles for durability and style.
Premium Designer Shingles for long-lasting luxury.
Browse our roofing projects to see how professional installation ensures maximum lifespan and performance.
📞 Final Word
Installing multiple layers of shingles might save money upfront, but it often leads to higher costs in the long run. For Kerala’s climate, a full replacement with proper underlayment and flashing is the most reliable way to prevent leaks and ensure durability.
👉 Need expert advice on whether to overlay or replace your shingles? Contact Scaffs India for a professional roof assessment today.