HomeProductsAccessoriesTimberTech® PRO-Tac™ Flashing and Joist Tape

TimberTech® PRO-Tac™ Flashing and Joist Tape

A heavy-duty, flexible, all-weather flashing and joist tape that helps extend the life of decking substructures by preventing water penetration and protecting joist lumber from rot.

Available widths: 1.625”, 2.5”, 3.25”, 4”, and 12”


Visit your local dealer or retailer to see and learn more about this product.

Superior Sealing

Keeps water out by providing a superior seal around screws at the fastening site. Won’t bunch, bind, or tear during screw driving.

Heavy-Duty Use

This tape’s strong backing won’t tear easily, even when walking on or dragging boards across the joist.


The butyl adhesive provides an advanced, secure bond to joists that won’t peel off.


Use in all weather conditions; rated for use in temperatures from -70°F to 200°F.

Available Widths (Black)

1.625” for single joists (16 rolls x 65’ length)
2.5” for single joists (10 rolls x 65’ length)
3.25” for double beams (8 rolls x 65’ length)
4” for general flashing (6 rolls x 65’ length)
12” for general flashing (4 rolls x 25’ length)

Also available in 36-case pallets, with the exception of 12” tape

Tape Construction

• Adhesive: Butyl Rubber (20 mils)
• Liner: PET (2 mils)
• Backing: TPO (6.5 mils)
• Total Thickness: 28.5 mils (+/- 2 mils)


Select a tape width that allows for overhang on each side and apply to the top of a joist or beam using firm pressure (preferably with a hand roller) to ensure adequate adhesion. It’s best to apply this tape to clean, dry lumber.

Questions about usage?

Download the Sell Sheet_PRO-Tac.

Questions About Installation?

We’re here to assist you with videos, guides, and more. View installation help.

Frequently Asked Questions

No questions are available for this product.

Get Inspired

Let Your Imagination Run Wild

silver maple radiance rail deck
1 / 2

AZEK Vintage Collection in English Walnut

silver maple radiance rail deck
1 / 2

AZEK Vintage Collection in Weathered Teak with Contemporary Rail in Black

silver maple radiance rail deck
1 / 2

TimberTech PRO Legacy Collection in Ashwood with Riser Lights

silver maple radiance rail deck
1 / 2

TimberTech PRO Legacy Collection in Tigerwood

previous arrow
next arrow

Call It an Investment in Better Value

Find a Contractor

Let us match you with one of our highly-skilled TimberTech Pros.

You May Also Like

decking img

Long-lasting, low-maintenance polymer and composite decking backed by the industry's best warranties.

railing img

Engineered for safety and designed for beauty, TimberTech railing is easily customizable to fit your style.

azek lighting postcap riser underrail evening 03 e1582317854947

Choose from a variety of lighting styles which fit beautifully with your TimberTech deck, porch, or railing.

ada azek vintage mahogany impression schneider067 e1582318074714

These unique tongue-and-groove porch boards offer the durability, easy up-keep, and beauty of TimberTech.

Love the look? Take the next step

Order Free Samples

Yep, we said free. Feel TimberTech Quality and see a variety of rich colors for yourself. We know you'll find your match.

TimberTech Decking Samples
Scroll to Top