When you’re investing in a new deck for your Michigan home, you want to make the right choices—both for your budget and for the long-term durability of your deck. One question we hear often at RN Construction, a Trex Pro Platinum Installer serving homeowners across the Greater Metro Detroit region—from Lansing to Ann Arbor, Sterling Heights, and Frankenmuth—is:

“Should I add butyl tape to the joists when building a deck with pressure-treated wood?”

The short answer: Not always.

What Butyl Tape Does

Butyl tape is a waterproof flashing tape applied to the tops of deck joists before the decking boards go on. Its main purpose is to prevent water from seeping into screw holes and sitting on the wood, potentially causing rot over time.

It’s often recommended for decks using composite boards, which can last decades—so homeowners don’t want the wooden frame failing prematurely.

The Reality: Pressure-Treated Lumber Already Lasts 25+ Years

Here’s the thing: Modern pressure-treated lumber is designed to last 25 years or more, especially when using ground-contact-rated material. That’s as long—or sometimes longer—than many butyl tape products are guaranteed for.

So if your deck frame is built with high-quality pressure-treated lumber, adding butyl tape on top of the joists often becomes redundant. The joists themselves will likely outlast the tape, especially if the deck is properly built, ventilated, and maintained.

No Building Code Requires Butyl Tape

Another point homeowners should know: There is no building code in Michigan requiring butyl tape on deck joists. It’s an optional upgrade, not a structural requirement.

Many contractors offer it as an “extra layer of protection,” but that doesn’t mean it’s essential for every project—especially when using top-quality pressure-treated framing materials rated for decades of performance.

When Butyl Tape Might Make Sense

While it’s not always necessary, there are times when butyl tape could still be worth considering:

• Shaded, damp areas where moisture lingers longer
• Decks with limited airflow underneath, where wood stays wet for longer periods
• Homeowners wanting every possible upgrade for maximum peace of mind

But for most Michigan decks using pressure-treated wood, you can skip the tape and still have a frame built to last.

Why RN Construction Builds Decks That Last

At RN Construction, we focus on using the right materials and best practices—not unnecessary add-ons. As a Trex Platinum Installer serving the Greater Metro Detroit region—including Lansing, Ann Arbor, Sterling Heights, Frankenmuth, and surrounding areas—we build custom decks designed to handle Michigan’s climate and stay beautiful for decades.

If you’re planning a new deck, we’ll help you make smart choices that fit your budget and your home’s needs—without pushing upgrades you don’t need.

Ready to Build Your Dream Deck?

Call RN Construction today at 810-625-8658 or visit www.yourcustomdeck.com to schedule a consultation. We’ll design a deck that looks amazing, lasts for decades, and is built with your best interests in mind.