Are you worried that when you meet with a roofer, you won’t know what to ask or that you’ll miss something important and end up paying for it later? Do you know how to tell if a roofer is actually looking out for your roof’s long-term performance or just trying to sell you a basic replacement and move on?
Most homeowners go into roofing consultations assuming the contractor will handle everything correctly. But the reality is, many critical details (like attic ventilation, proper materials, and realistic warranty expectations) are often overlooked or oversimplified. That’s how people end up with roofs that fail early, voided warranties, or hidden issues like mold and rot that show up years later.
At RoofSmart, we meet with hundreds of homeowners every year who feel confused and conflicted because so many of the roofers that they meet with focus on the importance of different things. This only makes the decision process more difficult because you don’t know who to believe.
Before you sit down with a roofer, it’s important to understand what actually matters (and what doesn’t). In this article, we’ll walk you through the key things to pay attention to so you can ask better questions, spot red flags, and make sure your new roof is built to last.
|
Topic |
What Matters Most |
What Doesn’t Matter Much |
Why It Matters |
|
Attic Ventilation |
Proper intake/exhaust balance and airflow |
Ignoring ventilation entirely |
Poor ventilation can shorten roof lifespan and cause mold |
|
Underlayment |
Type (synthetic vs felt vs ice & water) |
Brand name |
Most brands perform similarly; type impacts performance |
|
Shingles |
Proper installation and system compatibility |
Brand differences |
Most asphalt shingles are very similar in quality |
|
Warranty |
Coverage details and limitations |
Marketing claims |
Many warranties are hard to claim without proper installation |
|
Roofer Expertise |
Ability to explain decisions clearly |
Sales-heavy presentations |
Good roofers educate, not just sell |
|
Roof Design |
Custom plan based on your home |
Generic “standard replacement” |
Every roof has unique needs |
|
Inspection Process |
Thorough evaluation of attic + roof |
Quick surface-level inspection |
Hidden issues often start in the attic |
Most Seattle homeowners have no idea that their attic ventilation is outdated or not working properly. This is a problem because poor attic ventilation can ruin your roof. Despite this fact, very few roofers actually even address attic ventilation when working on your roof.
If you have poor ventilation in your attic, you might have one or more of the following problems:
Your attic should have some form of intake and exhaust ventilation. Ideally, air will enter near the bottom of your roof, flow upward, and then exit through the exhaust vents at the top.
The amount of ventilation you need depends on how big your attic is. Once you know the size of your attic, you can do the math to calculate how much ventilation you need.
If your roofer doesn’t address attic ventilation at all, then that’s a bad sign. Poor ventilation can cause your roof to fail early, so it’s best to fix it during your roof replacement.
Sloped roofs with complicated attic designs, rooftop decks, and flat roofs all require a different balance of ventilation and insulation.
One common thing we’ve noticed when meeting with customers is that a fair number of roofers like to fixate on a particular brand of underlayment and really hype up its importance on the roof.
Having underlayment is important, but pretty much all brands make the same product. You could choose any one of them and have a good underlayment.
If your roofer talks about how great one brand of underlayment is for a long time, that probably means he has nothing better to bring up (not a good sign).
When it comes to underlayment, the type matters more than the brand. There are three types of underlayment:
For Seattle homeowners, synthetic underlayment is best. It’s the standard type of underlayment that most roofers use these days. Felt underlayment is a cheaper alternative, but it’s a bad choice because it absorbs water.
Ice and water shield is used on certain parts of the roof where you might need extra reinforcement and waterproofing.
Most standard asphalt shingles meet the same quality and protection ratings with no meaningful performance difference. They’re made of the same material, look basically the same, and give your roof the same amount of protection.
For example, here’s a picture of standard asphalt shingles from 3 top manufacturers (Owens Corning, CertainTeed, and GAF) in similar shades:
Owens Corning
GAF Timberline UHDZ
CetainTeed Landmark
There might be a few small differences here and there, but overall, your standard asphalt shingle is going to be pretty much the same from any manufacturer. If you have a preference, feel free to choose it, or go based on the recommendation of your roofer.
Shingle manufacturers and roofers have a lot of fancy marketing techniques that can make one manufacturer sound more special than the others. But, at the end of the day, the shingles themselves are pretty similar. Sometimes the decision comes down to aesthetic preferences.
Your roofer or shingle manufacturer might advertise how great their warranty is, only for you to find out later that they’ll reject you for unknowingly doing something that voids your warranty.
Manufacturer and workmanship warranties usually provide coverage at their own discretion, making it difficult to get coverage. It is possible, but rare.
So, what’s the difference between manufacturer and contractor warranties?
We at RoofSmart always encourage our customers to get the highest level of manufacturer warranty possible because it provides you with the longest, most extensive coverage possible because of the workmanship coverage.
That way, if your roofer messes something up, you know that you can get coverage to fix it from the roofer or from the manufacturer. You don’t want to have to pay to repair your newly installed roof.
Make sure to ask your roofer what warranties are available to you if you choose them and, if possible, get a copy ahead of time so that you know what to expect from your warranty coverage before you sign anything.
Meeting with a roofer can feel overwhelming, especially when you’re trying to separate real expertise from sales talk. As you’ve learned, the most important factors (like attic ventilation, proper materials, and realistic warranty expectations) are often the ones that get overlooked or glossed over.
The truth is, the quality of your roof doesn’t just come down to the materials. It also comes down to the questions you ask and how your roofer answers them. A trustworthy contractor should be able to clearly explain their process, justify their recommendations, and address your roof’s specific needs, not just give you a generic proposal.
If you want to feel confident in your decision and avoid costly mistakes, the next step is knowing exactly what to ask during those conversations.
Read our article “How to Disqualify a Roofer” for a clear list of questions to help you evaluate roofers, spot red flags, and choose a contractor who will actually protect your home.
You should ask questions that reveal how thorough and knowledgeable they are, such as:
A good roofer should be able to clearly explain their answers, not avoid them.
Common red flags include:
These can indicate the roofer is more focused on closing the deal than building a long-lasting roof.
In most cases, no.
Standard asphalt shingles and underlayments are very similar across brands. What matters more is:
Attic ventilation is critical.
Poor ventilation can lead to:
If a roofer doesn’t address ventilation, it’s a major concern.
Warranties can provide protection, but they often have limitations.
Always review warranty details carefully, as coverage is often conditional.