Staples vs. Cap Nails for Roof Replacement Underlayment

If you’re getting a roof replacement in Rochester, NY, your roofing contractor will discussed underlayment fastening. It might sound like a small thing, but a lot of homeowners ask us which one is better—and why it matters.

So, what’s the difference between staples and cap nails? And which one do we recommend?

Let’s break it down in simple terms.

What Is Roof Underlayment?

When replacing your roof, we install a synthetic underlayment between the roof decking & the shingles. This layer acts as a moisture barrier, protecting your home from wind-driven rain and ice that might sneak under the shingles.

An essential part of every roofing system, protecting your home from leaks.

You must secure the underlayment to the roof deck. This is where to debate of cap nails or staples come in.

Staples: Fast, Simple, and Trusted

Why We Use Staples (Most of the Time)

At Rochester Pro Roofing, we usually recommend staples for underlayment, especially when we’re installing shingles the same day.

Here’s why:

• ✅ Faster Installation – Staples can be installed quickly with a staple gun. This saves time and keeps the whole job on schedule.
• ✅ Cost-Effective – Staples are much cheaper than cap nails. That means less material cost for us—and for you.

✅ Manufacturer-Approved – Manufacturers approve using staples as long as we install the shingles the same day.

✅ Tried and True – We’ve used this method on many roofs in Rochester and nearby towns like Greece, Irondequoit, and Penfield—with great results.

Roofers have used staples for decades, and they work well when covered by shingles soon after.

Cap Nails: What They Are and When They’re Used

Cap nails are fasteners with a plastic or metal cap that distributes pressure and holds the underlayment more securely. The cap will prevent tearing during high winds or extended exposure to the elements.

This is be beneficial in certain situations.

When Cap Nails Might Make Sense:

• 🌀 If a roof is going to be left uncovered overnight or during strong wind conditions
• 📏 When installing synthetic underlayment that specifically calls for cap fasteners
• 💧 If the underlayment will be exposed for multiple days before shingles are installed

So yes, cap nails do have their place. But in our opinion, they’re often overkill for most residential roof replacements.

Why We Don’t Always Recommend Cap Nails

Cap nails can be tricky. Here’s why we don’t typically use them for standard roof replacements:

• ❌ Harder to Install Correctly – Cap nail can be driven in sideways, or not fully penetrated. That kind of mistake can lead to problems down the road.
• ❌ Slower and More Labor-Intensive – Using cap nails takes more time and effort, which slows down the job and adds unnecessary cost.
• ❌ Questionable Waterproofing – Many people assume cap nails are “more waterproof,” but that’s not entirely true. The cap doesn’t fully seal the hole, and in our experience, it can even create weak points if not installed perfectly.
• ❌ Added Expense – Cap nail guns are expensive, and the fasteners themselves cost more. That added cost usually doesn’t bring enough benefit for the average Rochester homeowner.

You don’t need to use cap nails unless the underlayment will stay exposed for a long time.

What the Manufacturers Say

Most roofing underlayment manufacturers allow for staples, especially if the shingles are installed the same day. And since that’s exactly what we do for most jobs, staples meet all requirements—and then some.

We stick to what the manufacturer recommends in Rochester. If a job needs cap nails, we’ll use them—but we won’t suggest them just to make things more complicated or expensive.

What Matters: Proper Installation

No matter which fastener you use, the real key is installing it properly. A staple or a cap nail won’t work if it’s crooked, driven too hard, or spaced incorrectly.

At Rochester Pro Roofing, we install your roof the right way—every time.

Final Thoughts: Use What Works Best

If you’re getting a roof replacement in Rochester and you’re wondering whether staples or cap nails are better, here’s our advice:

• If your shingles are going on same-day (which is what we do 95% of the time), staples are perfectly fine.
• If there’s a delay, or your roof needs to stay uncovered because of weather or schedule, cap nails may be the safer choice.
• Cap nails aren’t bad—but for most jobs, they’re unnecessary and more expensive.

We’ll always choose what’s best for your roof based on the conditions, not just what sounds fancy or costs more.

Need a Roof Replacement in Rochester?

Whether you have storm damage, an old roof, or just want to plan ahead, Rochester Pro Roofing is your local roofer.

We’ll help you choose the right materials, install them the right way, and make sure your roof lasts for years to come.

📞 Call us today for a free estimate

📍 Serving the Great Rochester Area.

Rochester Pro Roofing – Professional. Practical. Proven. Rochester Roof Replacement