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Protect your joists from rot and water damage with heavy-duty TimberTech® PRO-Tac™ Flashing and Joist Tape by AZEK. This flexible flashing helps extend the lifespan of your deck framing by keeping water from seeping into your joists.

Select from four available widths (1-5/8 inch, 2-1/2 inch, 3-1/4 inch, and 4-inch) to find a tape that will cover the top of your joist and hang over a little on each side. The TimberTech® PRO-Tac™ Flashing and Joist Tape will create a moisture seal, keeping water out of your joist boards. This heavy-duty tape brings a firm hold and won't rip or tear easily, setting your deck up for years of water protection. PRO-Tac™ Flashing is effective in all weather conditions and rated for use from -70°F to 200°F.


DecksDirect # 188545

TimberTech® PRO-Tac™ Flashing and Joist Tape by AZEK Installation Instructions (1.04 MB) 

Sizes65 ft Rolls: 1-5/8 in, 2-1/2 in, 3-1/4 in, 4 in
25 ft Roll: 12 in
Material TypeSelf-Adhesive Butyl Tape with PET Liner
Tape Construction Adhesive: Butyl Rubber (20 mils)
Liner: PET (2 mils)
Backing: TPO (6.5 mils)
Total Thickness: 28.5 mils (+/- 2 mils)
Temperature RatingApplication Temperatures from 20°F to 170°F
Service Temperatures from -70°F to 200°F
Pack SizeEach

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