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.