Iron Woods EB-TY Hidden Deck-Fastening System

The EB-TY Premium system combines a Type 300 series stainless-steel reinforcing plate with a polypropylene body, creating a hidden fastener that actually holds up to Montana’s temperature swings. The angled screw attachment prevents board “walking” or sliding — a chronic problem with lesser hidden fasteners when wood expands and contracts through the seasons.

This system is specifically designed for hardwood movement. Three spacing options (3/32”, 3/16”, and 1/4”) let contractors adjust for different wood species and local conditions. For contractors working with Ipe, Garapa, Cumaru, Redwood, Cedar, or grooved composite boards, EB-TY creates a clean, screw-free deck surface without the headaches that plague plastic-only fasteners.

Metal-Reinforced Design Beats Plastic-Only Fasteners

The metal reinforcement separates this “Premium” version from the original all-plastic EB-TY design. The Type 300 series stainless-steel plate adds stiffness and increases pullover resistance. Translation: boards stay put through freeze-thaw cycles instead of gradually working loose.

Screw options include 305 stainless steel for standard installations or 316 stainless steel for enhanced corrosion resistance. That Grade 316 option matters near driveways where road salt spray hits the deck every winter. The angled screw through the fastener into the joist provides more lateral stability than top-down clips that only hold the groove.

Users note the metal tab holds decking in place “much better” than previous plastic-only iterations. When you’re dealing with Montana’s 100°F+ temperature swings between January lows and August deck surface temps, that metal backbone makes the difference between a deck that stays tight and one that develops gaps by year three.

Coverage Calculations and Installation Requirements

Getting the math right matters for job costing:

Pack Size	Coverage	Board/Joist Assumption
100-pack	~50 sq ft	6” boards, 16” OC joists
175-pack	~100 sq ft	Same parameters
275-pack	~160 sq ft	Same parameters
875-pack	~500 sq ft	Same parameters

Each pack includes a T-15 6-lobe star drive bit. The inclusion of the drill guide (EB-GUIDE) and driver bits in kits is highly valued for ensuring correct installation angles.

This system requires either pre-grooved boards or a biscuit joiner to create slots at each joist. No getting around it — if you’re not buying pre-grooved boards, factor in biscuit joiner rental and the time to cut slots. Tool requirements include a biscuit joiner (if not pre-grooved), EB-GUIDE drill guide (highly recommended for accuracy), and T-15 star bit.

Installation follows a specific sequence: Start by fastening the first board using face screws and wood plugs. Then use the EB-GUIDE drill guide to pre-drill holes at the correct angle through the side of the board and into the joist. Place the EB-TY fastener into the groove or biscuit-cut slot, drive the trim-head screw through the fastener and into the joist, apply a bead of construction adhesive to the joist before installing the next board, and slide the next board onto the exposed radius sides of the fasteners.

Worth It for Premium Hardwood and Composite Decks

The radius-side geometry eases insertion into pre-grooved or biscuit-cut slots and aids board alignment. Chamfered edges facilitate easier installation of successive boards. These design details speed installation once you get the rhythm down.

Simpson Strong-Tie products are engineered to meet or exceed building code requirements. Materials comply with Type 304/305 or 316 Stainless Steel standards for corrosion resistance and are engineered for use in pressure-treated lumber (ACQ compatible).

For contractors already committed to hidden fasteners on premium decks, the EB-TY Premium system delivers what matters: boards that stay put through Montana winters. The metal reinforcement, proper spacing options, and angled screw design solve the problems that make contractors swear off hidden fasteners. Not the cheapest option. But for Ipe and composite installations where visible fasteners aren’t acceptable, this system works.

Frequently Asked Questions

What makes the EB-TY Premium different from the original EB-TY?

The Premium version includes a metal reinforcing plate for significantly better holding power and less seasonal shifting compared to the older all-plastic design. Users specifically note the metal tab holds decking in place “much better” than previous plastic-only versions.

Can I use EB-TY fasteners with any decking material?

Compatible board types include Ipe, Garapa, Cumaru, Cedar, Redwood, and grooved composite. The system requires either pre-grooved boards or a biscuit joiner to create slots, so standard square-edge boards need slot cutting before installation.

How much coverage should I expect from each pack size?

Coverage varies by pack: 100-pack covers approximately 50 square feet, 175-pack covers approximately 100 square feet, 275-pack covers approximately 160 square feet, and 875-pack covers approximately 500 square feet, all assuming 6-inch boards and 16-inch on-center joists.

What’s included in the EB-TY Premium kits?

Kits typically include EB-TY Premium Fasteners (biscuits), stainless steel trim-head screws (305 or 316 grade), Ipe starter/end plugs (quantity varies by pack size), T-15 star driver bit, EB-GUIDE pre-drilling guide (included in many Premium kits), and 1/8-inch quick-release drill bit.