Joists

Joists are the horizontal structural members that carry floors, ceilings, and decks, distributing loads to beams and walls for a flat, quiet, and durable surface. You’ll find options in solid-sawn lumber, engineered wood (I-joists, LVL, LSL), and steel to match span, load, and jobsite conditions. Engineered I-joists offer long spans with lighter weight and consistent straightness, reducing callbacks from shrinkage or squeaks. Solid-sawn floor joists remain a cost-effective choice with familiar fastening and field modifications. LVL and LSL add strength where openings, stairwells, and point loads demand it. Steel joists provide high strength-to-weight for demanding residential and commercial framing.

Choose joists with the right depth, spacing, and material to meet code and performance goals. Consider:
- Span tables and deflection targets (L/360 or L/480 for tile/stone).
- Joist spacing: 12, 16, or 24 inches on center to balance stiffness and material use.
- Subfloor compatibility; thicker panels for wider spacing and reduced bounce.
- Moisture exposure: pressure-treated deck joists, end sealing, and joist tape for durability.
- Hardware compatibility: properly sized joist hangers, rim boards, blocking, and corrosion-resistant fasteners (stainless or hot-dip galvanized near salt or treated lumber).
- Acoustic and fire requirements: insulation, resilient layers, and fireblocking details.

Installation tips that pay off:
- Crown members consistently and maintain proper end bearing.
- Lay out from a straight reference line and square the first bay.
- Use structural nails or screws specified for hangers; add subfloor adhesive to cut squeaks.
- Follow limits for notching and drilling; locate holes in approved zones.
- Provide blocking or bridging to share loads and improve floor feel.
- Flash ledgers and ventilate cavities to manage moisture.

Shop floor joists, ceiling joists, deck joists, engineered I-joists, LVL joists, and steel joists, plus hangers, fasteners, rim boards, and accessories. Build stiffer floors, quieter rooms, and longer-lasting decks with the right joist system from Lumber & Composites.