What Roofing Warranties Actually Cover (And What They Don't)

You Actually Have TWO Warranties (And One Matters More)

When you get a new roof, you receive two separate warranties:

1. Manufacturer warranty: Covers defects in the shingle itself (manufacturing flaws, premature deterioration, etc.). This comes from Tamko, GAF, or whoever made the shingles.

2. Workmanship warranty: Covers errors in how the roof was installed. This comes from your contractor.

Here's the truth most people don't hear: your workmanship warranty is more important. The vast majority of roof failures we see aren't caused by defective shingles — they're caused by improper installation. Wrong nailing patterns, missing flashing, inadequate ventilation, no ice shield.

The Fine Print on Manufacturer Warranties

That '50-year lifetime warranty' has a lot of conditions:

• Most are prorated after year 10 — you pay an increasing percentage of replacement cost
• Coverage decreases each year: by year 20, coverage may be only 30-40% of replacement cost
• Installation must meet specific manufacturer requirements or the warranty is void
• Proper ventilation is required — most manufacturers require 1:150 or 1:300 ventilation ratio
• Only certified installers can activate the full system warranty
• 'Lifetime' means the useful life of the product as defined by the manufacturer — not your lifetime

What Voids Your Warranty (Most People Have No Idea)

Here's the scary part: if your contractor made even small installation errors, your manufacturer warranty may already be void. And you won't know until you try to make a claim.

Common installation errors that void manufacturer warranties include incorrect nail placement (too high, too low, overdriven, or underdriven), missing starter strip at eaves, inadequate attic ventilation, wrong underlayment, missing ice and water shield, and overlaying new shingles on old ones without manufacturer approval.

This is exactly why contractor selection matters more than shingle selection. A certified contractor follows manufacturer specifications to the letter — protecting your warranty investment.

Side-by-Side: Comparing the Warranty Tiers

Manufacturers offer multiple warranty tiers depending on which components are installed and whether the installer is certified. Most homeowners are quoted the basic tier without realizing a system warranty is available — often at little or no extra cost — when a certified contractor installs a complete system. Here's what the tiers actually look like across the major brands we install in Louisville.

What a Warranty Claim Actually Looks Like in Louisville

When a Louisville homeowner calls us with a warranty concern, the process usually plays out the same way. First, we identify whether the failure is a material defect or an installation defect — that determines which warranty applies. If it's clearly a material defect (premature granule loss across the entire roof, blistering on a brand-new shingle, color streaking that doesn't match the spec sheet), we help the homeowner file the claim directly with TAMKO, GAF, or Owens Corning. The manufacturer typically requests photos, the original invoice, the shingle wrapper code, and proof that a certified installer did the work. If approved, the manufacturer ships replacement materials, and labor is covered only if a system or premium tier warranty was activated.

If the failure is installation related — leaks at flashing, lifted shingles from improper nailing, ice damming caused by missing ice shield — that's a workmanship claim, and it goes to the contractor that did the install. This is exactly why hiring a stable, established Louisville roofer matters: a manufacturer warranty is only as good as the company still being in business 10 or 15 years later. Homestretch Roofing has been serving Louisville since 2010, and our 25-year workmanship guarantee follows the home, not just the original homeowner.

What to Verify Before You Sign a Roofing Contract

Before you sign any roofing proposal in Louisville, get the warranty terms in writing and confirm these specifics. Don't accept a verbal '50-year warranty' on a sales pitch — ask for the manufacturer's warranty document and your contractor's workmanship warranty document, both as PDFs.

• Which manufacturer warranty tier is being installed (Standard, System, or Premium)
• Whether the contractor is certified by that manufacturer to activate the higher tier — ask to see the certification ID
• How long the contractor's own workmanship warranty lasts and exactly what it covers
• Whether either warranty is transferable if you sell your home, and how many transfers are allowed
• What invalidates the warranty (skipped ice shield, wrong ventilation, missing flashing — all common shortcuts)
• Whether labor costs for warranty claims are covered, or only material costs
• Where the warranty registration paperwork will be filed and how you'll receive a copy