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One question a lot of roofing contractors and DIYer’s have about synthetic underlayment is the type of fasteners that should be used to hold it down. For Epilay products, the same fasteners will work across all grades—Superior, Ultra and Platinum—which means the primary consideration will be the length of time that the underlayment is exposed prior to installing the roofing material. Here’s a quick guide to help you choose the right fasteners!

Fasteners for Same-Day Rooftop Installation

The beauty of Epilay products is that they’re all designed to work with standard, code-approved fasteners. In fact, all fasteners will work with our Superior, Ultra and Platinum grades of underlayment. The main difference in fastener choice depends on whether you plan to install the rooftop over the underlayment the same day or not. If the rooftop will be installed same-day, then you’re free to use corrosive-resistant roofing nails with 3/8” heads, plastic cap nails, 7/16” crown staples, regular roofing staples, or other types of code-approved fasteners.

Fasteners for Extended Exposure or High Traffic Installation

Underlayment that will be exposed for a while is at greater risk of tearing and so is underlayment on high-traffic roofs. For this type of installation, you’ll want to stick with either cap nails, crown cap staples, or roofing nails with 3/8” heads. These three fastener types will help prevent tears, and on rooftops that will be exposed for a while, they prevent water infiltration around the fastener heads.

And there you have it! Code-approved fasteners will work well with Epilay underlayments, but if you’re planning to leave the underlayment exposed, you’ll need a fastener with a larger head to help prevent tears and leaks. If you’d like to learn more, check out our videos on installation tips for each of Epilay’s synthetic underlayment products!