LDD-22 · Basketball Hoop System
One-line intent
No wall-mounted load — independent slab-anchored steel goal frame.Locked decisions
- Core rule: no wall-mounted load.
- Independent steel goal frame anchored to slab
- Load path: backboard → steel → slab
- Dunk-rated · no vibration · professional feel
Open items / engineer review
- Frame manufacturer + model (Goalrilla, Mammoth, First Team Sport II, Bison)
- Backboard: 72" tempered glass for pro feel
- Rim: breakaway pro rim
- Anchor detail: 4 bolts in slab during pour (not retrofit)
- Retraction strategy: fixed cantilever vs winch-folded ($4–10K adder)
- Single hoop or two (60' wide gym fits half-court easily; full-court 84' needs the building length)
- Court line painting on urethane floor (LDD-24)
Cost drivers
Pro-grade slab-anchored hoop $4–18K · Retractable mechanism (if chosen) +$4–10K · Anchor + slab prep $0.5–1.5K · Second hoop for full court +$4–18K · Court lines $1.5–4K. Single fixed: $8–14K. Retractable full-court: $16–35K.Air-gap concerns
- Anchor pattern must be set before slab pour. Retrofit via core drill + epoxy works but less robust under repeat dunk impact.
- Slab thickness under hoop — typically 8" + #4 rebar at 12" OC vs 4–6" elsewhere. Coordinate with structural.
- Backboard clearance to clerestory when retracted (LDD-04).
- True full-court won't fit 60' E–W; practice court (43') easily fits.
- Net spec — chain or pro nylon; buy spares.
Cross-references
Diagram
Backboard placement defines the central no-glass zone on the hero wall.