Anybody can buy shingles. That is worth sitting with for a second, because it explains most of the confusion around roof warranties.

A shingle manufacturer sells to distributors. Distributors sell to anyone with a contractor account. So the fact that a roofer shows up with GAF shingles on the truck tells you nothing about whether they are certified to install them — and it is the install, not the shingle, that decides whether your warranty is worth anything.

Two Warranties, Not One

Every roof you pay for comes with two separate promises, and homeowners routinely think they have one when they have the other.

  • The manufacturer warranty covers the material — the shingles themselves. It comes from GAF, not from your roofer, and it survives even if the roofer goes out of business.
  • The workmanship warranty covers the installation — the labor, the flashing, the nailing, the details. It comes from your roofer and is only as good as the roofer. Ours is a 1-year limited warranty on repairs, with longer terms on full installations.

Here is the part that catches people. The manufacturer warranty has conditions. If the roof was not installed to GAF’s specification, GAF can decline the claim — and the material coverage you were counting on evaporates at exactly the moment you need it.

A warranty you cannot collect on is not a warranty. It is a brochure.

What Certification Actually Requires

To become a GAF Certified contractor, a roofer has to demonstrate that they install to the manufacturer’s standard — not approximately, but specifically. That covers things no homeowner will ever inspect:

  • The right underlayment for the slope and the climate, including ice-and-water shield where code and common sense require it.
  • The nailing pattern. Number of fasteners, placement, depth. Overdriven nails void coverage and are invisible once the next course goes on.
  • Ventilation. A roof that cannot breathe cooks its own shingles from underneath. Intake and exhaust have to be balanced, not just present.
  • Flashing details at every chimney, wall, valley, and penetration — which is where the overwhelming majority of leaks actually start.

Certification also means the manufacturer is willing to attach their name to the work. That is a real filter. It is not a sticker you buy.

The Enhanced Coverage You Can Only Get This Way

The practical benefit of hiring a certified contractor is access to warranty tiers that are simply not available otherwise. GAF’s enhanced system warranties — the ones that cover the full roofing system rather than just the shingles, for a longer term — require a certified installer. A non-certified roofer cannot register them no matter how good their work is.

So the same shingles, installed by two different roofers, can come with meaningfully different protection. That is the whole thing in one sentence.

Garrison’s credentials

GAF Certified Residential Roofing Contractor, GAF ID 1147683, PA license #PA057955, licensed and insured. Every crew on your roof is in-house — no subcontractors — which is the other half of why the install holds up.

Five Questions To Ask Any Roofer

You do not need to know roofing to ask these. You just need to listen to how confidently they answer.

  • “Which manufacturer certifies you, and what is your ID number?” A certified contractor can produce this immediately. Hesitation is your answer.
  • “What warranty tier will you register for my roof, and who registers it?” If they cannot name the tier, they may not be able to register one at all.
  • “What is your workmanship warranty, in writing?” Verbal warranties are worth exactly nothing in three years.
  • “Are the crews your employees or subcontractors?” This determines who is actually accountable for the install.
  • “What underlayment and ventilation are you specifying, and why?” You do not need to evaluate the answer. You need to hear that there is one.

How to Verify Independently

Do not take anyone’s word for it, including ours. GAF publishes a contractor directory you can search by name and location. Look the roofer up before you sign. It takes two minutes and it is the single highest-value thing you can do in the hiring process.

Also verify the state license number and ask for the certificate of insurance directly from their carrier, not a photocopy. Any legitimate contractor expects to be asked.

The straight answer

Certification does not make a roofer honest. It makes the install verifiable and the warranty collectible. You still have to judge the rest — which is why we send photos and a written report on every inspection, so you can see what we saw instead of taking our word for it.

Questions about coverage on a roof we would be installing for you? See our shingle roofing page or call 267-977-6452.