When you purchase a new roof or siding, you’re not just investing in curb appeal, you’re investing in protection. A manufacturer or contractor warranty offers peace of mind, but it comes with strict terms. If you unknowingly break those terms, you could be left footing the bill for repairs that would have been covered.
Here are 10 common mistakes homeowners make that can void roof and siding warranties, along with what to do instead.
1. Skipping Professional Inspections
Most warranties require proof of regular maintenance and inspections. Skipping these visits is like skipping oil changes on your car when something goes wrong, coverage may be denied.
👉 Learn what to expect in a professional roof inspection and why it’s smarter than relying on DIY checks.
2. Doing DIY Repairs or Hiring Handymen
Quick DIY patches might feel cost-effective, but they almost always void warranties. Manufacturers want certified installers using proper techniques. Even small mistakes like incorrect nail placement can compromise the system.
👉 Read about roof shingle repair mistakes to avoid to see why professional repair matters.
3. Using Unapproved Materials
Mixing and matching shingles, underlayment, or siding panels from different manufacturers is a fast way to void coverage. Warranties only apply if you use the approved system components.
👉 When choosing materials, check out choosing the best roofing materials for long-term value.
4. Ignoring Attic Ventilation and Insulation
If your attic doesn’t breathe, heat and moisture build up. This can warp shingles, damage siding, and shorten your roof’s life. Warranties usually require proof of proper ventilation and insulation.
👉 See why roof ventilation and insulation go hand in hand.
5. Adding Hardware or Decorations Improperly
From satellite dishes to Christmas lights, attaching items directly to your roof or siding can puncture protective layers. That damage? Not covered.
👉 Check out the safe way to attach to a shingle roof and hang Christmas lights on a shingle roof.
6. Power Washing Roof or Siding
High-pressure washing might make surfaces look clean, but it strips away protective coatings and can drive water under shingles or panels. This often voids warranties.
👉 Learn the right way to clean your roof and siding.
7. Neglecting Gutter Care
Overflowing gutters cause water damage to roofs and siding. Many warranties exclude damage caused by poor water management.
👉 Understand the risks in common issues caused by gutters and when to repair or replace gutters.
8. Installing New Shingles Over Old Ones
Some homeowners try to save money by layering shingles. This can trap heat, cause uneven surfaces, and void coverage entirely. Manufacturers typically require complete tear-offs for warranty validity.
9. Making Unapproved Structural Changes
Adding skylights, dormers, or siding extensions without notifying your contractor can compromise the system. Warranties usually require that modifications be performed by certified professionals.
👉 If you’re considering upgrades, see our guide to installing a skylight the right way.
10. Using Unlicensed or Non-Certified Contractors
Even if materials are perfect, your warranty is only valid if installation was performed by certified professionals. Hiring the cheapest option could cost you far more in the long run.
👉 See why hiring the right roofing contractor vs. general contractor matters.
Protect Your Investment
Your roof and siding warranty is only as strong as the care you put into maintaining it. Avoid these ten pitfalls, keep documentation of all professional services, and always choose certified experts.At Weather Vane Roofing, we’re here to help you stay protected not just with high-quality installations but also with long-term peace of mind.
