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Roofing Warranties Explained: Part 2 — Manufacturers | Pacific West Roofing

Roofing Warranties Explained: Part 2 — Manufacturers

While the workmanship warranty and job agreement (outlined in part one) can be negotiated, the manufacturer’s warranty is set in stone. There’s nothing you or your roofing contractor can do to adjust it. Therefore, it is very important that both you and your roofer understand each term and condition. Roofing Warranties Explained: Part 2…

A manufacturer’s warranty on asphalt shingles, for example, will typically address:

  • Methods of installation
  • Finished system performance
  • Finished job appearance
  • Warranty transferability

The overall finished appearance satifies the homeowner the biggest. System performance is also important. But these days much of that relies on the quality of workmanship. Not the materials themselves. On the other hand, a new roof can sometimes look a bit different than you expected it to. That can lead to claims against the manufacturer’s warranty. The appearance of a finished roof can be affected by a number of variables. Such as color, staining, patterns, decking issues, and damage.


We try to warn homeowners against hanging all their expectations on product samples and color specifications they see in print. Shingle color is not an exact science even though they are computer controlled. It can vary to the eye according to the time of day and the weather. Also change as the shingles get older. This is often because the position of granules on the shingles can create tiny shadows. And then those granules tend to wear away with time. Because of this, many manufacturers simply exclude color variations from their warranties.


New shingles can sometimes become stained while still in the packaging. Because oils or minerals get transferred from the underside of one shingle to the face of another. In most cases, once installed natural weathering will wash away these stains. But, if the stains are still visible after 60 days be sure to contact the manufacturer.

Algae is causing the most common type of stain you’ll see on older roofs. Which people often confuse with mold or fungus. The manufacturer’s warranty doesn’t cover algae stains. Unless algae-resistant shingles were used. As it is a symptom of poor maintenance on the homeowner’s part. Warranty terms regarding algae-resistant shingles vary by manufacturer.

Ugly Patterns

When shingles are not installed according to the manufacturer’s instructions, strange color patterns can appear. An inexperienced or unethical roofer might misalign shingle cut outs or ignore dimensional tolerances. Because of this, manufacturer warranties disclaim liability for improper installation.

Deck Movement or Failure

A new roof can also become unsightly if there are problems with the decking. If the surface that the shingles are nailed to begins to shift or fails altogether, the shingles can curl. They can also develop objectionable ridges. Inadequate ventilation, poor nailing of the deck and other oversights causes such issues. Shingle manufacturers warranty coverage excludes these problems.


Anytime you do any remodeling like installing a skylight, your roof is susceptible to damage. The manufacturer’s warranty never coveres this. So when working on your home, make sure to schedule the roofing work. So that it won’t be affected by other projects or workers.

Furthermore, shingle damage caused by a homeowner’s efforts to remove snow and ice is typically excluded. Also damage caused by aftermarket coatings, paints, chemicals, and cleaners.

Have more questions about the warranty on your roof? call 503-635-8706.

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