Joist Tape (Deck Flashing Tape)
Self-adhesive butyl tape applied to the tops of deck joists before decking installation. Prevents water from sitting in fastener holes and causing premature joist decay.
In Detail
Joist tape extends deck joist life by 2–3× by shedding water away from screw penetrations. Products like Trex Protect, G-Tape, and ZIP System Flashing Tape are commonly used. The tape's butyl adhesive self-seals around screw shafts. Apply it to the top edge of all joists, rim joists, and blocking before installing deck boards. Cost: typically $0.10–$0.20 per linear foot.
Related Materials
Pressure-Treated Lumber
Pressure-treated lumber is dimensional softwood (typically Southern Yellow Pine) infused with preservative chemicals under pressure to resist rot, decay, and insect damage. The most common decking and structural lumber for outdoor applications.
Composite Decking
Composite decking combines wood fiber and recycled plastic (PVC or polyethylene) into a board that mimics the look of natural wood with dramatically lower maintenance requirements. The fastest-growing segment of the decking market, with top brands including Trex, TimberTech, and Fiberon.