S F Johnson Consulting, LLC
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Division 06

Division 06

🪵 Division 06 — Wood, Plastics & Composites

Rough & finish carpentry • Sheathing & subfloors • Engineered wood • Plastic fabrications/FRP/PVC • Casework & millwork • Fasteners & connectors • Field QA. Verify with plans, ICC/APA/AWI/Manufacturer details, and local code.

🧭 Scope (What Div 06 Covers)

  • Rough carpentry: studs, plates, blocking, nailers, sheathing, subflooring, roof/floor framing (wood).
  • Finish carpentry & architectural woodwork (coord. with AWI) — trim, doors/window casings, shelving.
  • Engineered wood: I-joists, LVL/PSL/Glulam, rim boards, structural panels.
  • Plastics/composites: FRP panels, PVC/HDPE trim, solid surface, composite decking & fascia.
  • Anchorage: connectors, straps, holdowns (coord. with Div 05/structural plans).

🌲 Lumber Basics

  • Nominal vs Actual: 2×4 → 1½"×3½"; 2×6 → 1½"×5½"; 4×4 → 3½"×3½".
  • Grades: No.2 SPF/HF for studs (verify); Select/No.1 where specified.
  • Moisture content: KD 15–19% (interior framing). Acclimate finish materials to space RH.
  • Pressure-treated: sill plates & ground-contact; treat field cuts with preservative.

🧱 Sheathing & Subfloors (Typical)

  • Wall/roof sheathing: OSB/ply 7/16"–5/8" (verify span rating).
  • Subfloor: 23/32" T&G Adv/ply typical; glue + ring-shank/ screws.
  • Gaps: 1/8" at panel ends/edges (unless T&G); ¼" at walls.
  • Nailing patterns (example – verify project/APA): edges 6" o.c.; field 12" o.c. (shear walls often 4"/8" or tighter per plan).

📦 Structural Panels (APA)

  • Stamp: “Rated Sheathing/Underlayment”, span rating (e.g., 32/16), exposure (Exterior/Exposure 1).
  • Install with face grain ⟂ to supports; use panel clips where required.
  • Subfloor adhesive: 3/8" serpentine bead on joists; fasten within glue open time.

🔩 Nails, Screws & Connectors

  • Use ring-shank for subfloors; screws minimize squeaks.
  • Connector hardware: Simpson/USP per schedule; use specified fasteners (diameter, length, coating).
  • PT wood: use hot-dip galvanized or SS fasteners/hardware.
  • Anchor bolts: ½" @ spacing per plan; sill sealer under PT sill; tighten after shrinkage.

🪵 Engineered Wood (I-Joists/LVL/Glulam)

  • Follow manufacturer’s span tables, bearing lengths, and hole charts.
  • Provide web stiffeners at hangers/bearings where required.
  • Do not notch flanges; holes only per guide (zones & max sizes).
  • Hanger models must match member type/thickness; use uplift nails where required.

🪟 Openings, Shear & Holdowns

  • Headers: LVL/Glulam sizes per schedule; jack/king stud counts per span.
  • Shear walls: edge nailing pattern, blocked panels, chords, strap laps, and holdowns per detail.
  • Uplift: clips/straps at rafters/trusses; continuous load path to foundation.

🧱 Blocking & Backing

  • Provide solid blocking for cabinets, grab bars, rails, restroom accessories, and MEP supports.
  • Fireblocking/draftstopping per code at floor/ceiling cavities, penetrations, and soffits.
  • Continuous nailers at WRB/flashings, parapets, and expansion joints (coord. with Div 07).

🧼 Plastics & Composites

  • FRP panels: use approved adhesive, backer where required; trim kits; maintain expansion gaps.
  • PVC/HDPE trim & fascia: scarf joints, hidden fasteners; allow for thermal movement.
  • Composite decking: manufacturer’s joist spacing, clips, gapping; color-match fascia fasteners.

🗄️ Casework & Millwork (AWI)

  • Quality level: Economy / Custom / Premium (per spec).
  • Substrates: particleboard, MDF, plywood; edge banding vs. solid wood.
  • Shop drawings & samples (finish/edge/door style) before fab.
  • Moisture & acclimation: condition to occupied RH before install.

🎨 Field Finish & Tolerances

  • Subfloor flatness for resilient/hardwood; sand seams; screw pops fixed.
  • Trim reveals consistent; miter joints tight; fastener holes filled per finish schedule.
  • Adhesives/caulks: low-VOC where required; follow open times/temps.

🧮 Quick Math & Takeoff Shortcuts

Board Feet (BF)

BF = T(in) × W(in) × L(ft) ÷ 12. Example: 2×10×12' → 2×10×12÷12 = 20 BF.

Stud Count

Count ≈ (wall length × 12 ÷ spacing) + corner/T/win/door studs.

16" o.c. → length(ft)×0.75 + extras.

Sheet Count

4×8 sheet covers 32 SF. Sheets ≈ Area ÷ 32 (+ waste & openings).

Subfloor Fasteners

Approx pieces/sheet @ 6" edges & 12" field ≈ (perimeter ÷ 0.5) + (field rows × length ÷ 1) (rule-of-thumb 50–60).

Header Rough Sizing (ROM)

Light loads: (span ft × 2) = LVL depth (in) start point (engineer governs).

Trim/Base LF

Room perimeter = 2×(L+W) − door widths (add waste 10%).

✅ QA / Submittals

  • Lumber grade stamps; PT retention tags; panel APA stamps visible.
  • Shop drawings for casework/millwork; hardware schedules; finish samples.
  • Connector submittals (models, nails/screws, uplift/shear values) must match plans.
  • As-built locations for blocking & nailers for future work.

🦺 Safety Notes

  • Saw/planer guards; eye/hearing protection; dust collection/respirators for MDF.
  • Ladder/scaffold fall protection; secure materials from roll-off/slide.
  • Adhesives/finishes: flammable & VOCs — ventilation and ignition control.

📝 Self Test

  1. Compute board feet for three 2×12×14' members.
  2. How many 4×8 sheets to cover 1,280 SF of wall (10% waste)?
  3. Give a typical sheathing nailing pattern for walls (edge/field).
  4. List two reasons to use ring-shank nails on subfloors.
  5. Why are web stiffeners used on I-joists?
  6. What fastener/finish should be used with PT lumber?
  7. Two required elements in a shear wall detail besides sheathing thickness.
  8. What’s the acclimation rule for architectural casework?
  9. What must match when selecting joist hangers?
  10. Rough count: 36' wall @ 16" o.c. studs (ignore openings) — how many studs?

Answers: (1) 2×12×14' → 2×12×14÷12 = 28 BF each; ×3 = 84 BF. (2) 1,280 ÷ 32 = 40; +10% ≈ 44 sheets. (3) Example: 6"/12" (verify drawings/APA; shear walls may be tighter, e.g., 4"/8"). (4) Better withdrawal; fewer squeaks. (5) To prevent web crushing at high reactions/hanger seats. (6) Hot-dip galvanized or stainless fasteners/hardware. (7) Edge nailing pattern and chord/holdown details (also blocking & strap laps). (8) Condition to space temperature/RH before install; finish materials acclimated. (9) Member type/thickness & manufacturer (hanger model + nail schedule). (10) (36×12)/16 + 1 ≈ 27 + 1 = 28 studs (plus corner/T/king/jack as required).