NCCER Carpentry Modules

Exam blueprint

Sourced from NCCER Carpentry Trainee Guide (Levels 1-4, current editions) — Module Codes 27101 through 27408

• Orientation, basic safety, jobsite (27101, 27102)8%
• Hand tools (27103)8%
• Power tools (27104)8%
• Reading construction drawings (27105, 27305)10%
• Trade math + measurement (27106)10%
• Building materials, fasteners, adhesives (27107)8%
• Floor systems + framing (27108, 27201)12%
• Wall + ceiling framing (27109, 27202, 27203)12%
• Roof framing (27204, 27205)10%
• Exterior finishing — siding, soffit, fascia (27206, 27207)7%
• Stairs, drywall, cabinetry, advanced topics (Level 3 + 4)7%

1. 01Orientation + tools (NCCER Modules 27101-27104)

   ~105min

   Day-one trainee material — what carpentry is, how to stay safe, what every tool does. Hand-tools and power-tools modules together account for roughly 25% of Level 1 hours.

   • Basic jobsite safety (Module 27102)

     OSHA 1926 governs construction safety. Every NCCER Level 1 trainee learns: PPE basics — hard hat (Type II preferred), safety glasses (Z87.1 with side shields), steel-toe boots, hearing protection in high-noise areas, gloves matched to hazard (cut-resistant for sheet metal, leather for material handling). FALL PROTECTION at 6 ft on construction sites (1926.501). LADDER SAFETY: 3-points-of-contact rule, ladder extends 3 ft above landing, 4:1 base-to-height ratio. LOTO awareness — never reset a tool you didn't lock out. SDS access — every chemical on site has a Safety Data Sheet posted in a known location. NCCER's safety module integrates the OSHA-10 curriculum content; many programs award OSHA-10 cards alongside Level 1 completion.

     Reference: NCCER 27102 Basic Safety + OSHA 1926

   • Hand tools (Module 27103)

     Carpenter's essential hand tools, by category. MEASURING + LAYOUT: 25 ft tape, framing square, speed square, combination square, chalk line, plumb bob, levels (4 ft + torpedo), pencils. CUTTING: utility knife, hand saws (crosscut + rip), coping saw, hacksaw. STRIKING: claw hammer (16 oz framing, 22 oz framing), rubber mallet, sledge. FASTENING: screwdrivers (Phillips #1/#2, slotted), nail set, pry bar, nail puller. SHARPENING + MAINTENANCE: file, sharpening stone. STORAGE: tool belt, pouch, tool bag. Quality matters — Estwing hammers, Stanley FatMax tapes, Klein/Knipex pliers are professional standards. Tool care: clean after use, oil metal surfaces, replace damaged handles before next use. A trainee with neglected tools telegraphs neglect on the work.

     Reference: NCCER 27103 Hand Tools

   • Power tools (Module 27104)

     Carpentry power tools: CIRCULAR SAW (worm drive vs sidewinder — worm drive heavier but stronger torque; sidewinder lighter and more common in residential), MITER SAW (10" or 12" sliding compound), TABLE SAW (jobsite or contractor), ROUTER, PLUNGE ROUTER, JIGSAW, RECIPROCATING SAW (sawzall), HAMMER DRILL (corded for masonry), CORDLESS DRILL/IMPACT DRIVER (the modern day-one driver is an 18 V brushless impact). NAILERS: framing nailer (round-head 3-1/2"), siding nailer, finish nailer (15 ga or 16 ga), brad nailer (18 ga), pin nailer (23 ga). Compressor + hose, OR battery-powered nailers (DeWalt, Paslode, Milwaukee all have full-power cordless). Safety FIRST: blade guards in place, eye + ear protection, never disable safeties, never operate above your training level. Apprentices typically hold off on circular-saw use until they've seen the journeyman cut for several days.

     Reference: NCCER 27104 Power Tools

   Practice questions (2)

   1. 1. OSHA 1926.501 requires fall protection on a construction site at what minimum height?

      • A.4 ft
      • B.6 ft✓ correct
      • C.10 ft
      • D.12 ft

      OSHA 1926.501 — fall protection required at 6 ft for construction. (General industry under 1910 uses 4 ft, but construction is 6 ft.) 10 ft and 12 ft are not OSHA thresholds. The 6 ft trigger covers most residential framing scenarios — the second-floor deck, the roof eave, scaffold work.

   2. 2. Which type of saw is best suited for cross-cutting framing lumber on a sawhorse?

      • A.Coping saw
      • B.Reciprocating saw
      • C.Circular saw✓ correct
      • D.Hacksaw

      A circular saw is the carpentry standard for cross-cutting and rip-cutting framing lumber on a sawhorse — fast, accurate enough with a speed square, and portable. A coping saw cuts curves in trim. A reciprocating saw is for demolition or rough cuts where finish doesn't matter. A hacksaw is for metal. Set the depth to slightly less than the lumber thickness to avoid cutting the sawhorse.

2. 02Reading drawings + trade math (Modules 27105, 27106)

   ~120min

   Plans, elevations, sections, details, and the schedule pages. Plus the math a carpenter uses every day — fractions, areas, the framing-square stair table.

   • Drawing types — plans, elevations, sections, details

     A construction drawing set uses STANDARD VIEWS to convey the building from multiple angles. PLAN view = looking down from above (floor plans, foundation plans, roof plans). ELEVATION = looking horizontally at a face (front elevation, rear elevation, left/right side). SECTION = a vertical cut through the building exposing assembly (wall section showing footing, foundation, framing, sheathing, finish). DETAIL = a small enlarged view of a specific assembly (eave detail, window head detail). Each view has a SCALE: 1/4" = 1'-0" is typical for plans; 3/4" = 1'-0" or 1-1/2" = 1'-0" for details. Sheets are organized by discipline: A = Architectural, S = Structural, M = Mechanical, P = Plumbing, E = Electrical. The CARPENTER's primary references are A and S sheets.

     Reference: NCCER 27105 Reading Construction Drawings

   • Architectural symbols + dimensioning

     Standard symbols: door = arc with a line indicating swing direction; window = parallel lines through a wall; stair = a series of parallel lines with up/down arrow; electrical receptacle = circle with two/three lines. DIMENSIONS on plans run "outside-to-outside" or "centerline-to-centerline" depending on the convention noted on the title block. Dimension strings: an outside string giving the building outside-to-outside, a middle string giving partition dimensions, an inside string giving rough opening centers. ROUGH OPENING dimensions for windows and doors are given in the schedule and may differ slightly from the unit size — always frame to the rough opening, not the unit size. Reading dimension strings carefully is the difference between a wall in the right place and an entire framing crew tearing out a day's work.

     Reference: NCCER 27105 Drawing Conventions

   • Fractions, decimal feet, areas

     Carpentry math basics: ADDING FRACTIONS requires common denominators. 5-3/8" + 2-1/4" = 5-3/8 + 2-2/8 = 7-5/8". DECIMAL FEET conversion: 0.5 ft = 6", 0.25 ft = 3", 0.125 ft = 1-1/2", 0.083 ft ≈ 1". A tape measure is the source of truth — check before you trust a calculator. AREA: a 12 ft x 16 ft room = 192 sq ft. RECTANGLE = L x W. TRIANGLE = (1/2) x base x height. CIRCLE = πr². Ordering material: 192 sq ft of flooring at 22 sq ft/box = 8.7 boxes → order 9, plus 5-10% waste = 10. Cut-list for a deck or a stair stringer derives from these basics. Mistakes here mean a return trip to the lumberyard at the end of the workday.

     Reference: NCCER 27106 Trade Math

   • Pythagorean theorem + the 3-4-5 rule

     For ANY right triangle, a² + b² = c². Carpenters use this to lay out square corners. The 3-4-5 RULE: a triangle with sides of 3, 4, and 5 (any units — feet, inches, yards) is automatically a right triangle (because 3² + 4² = 9 + 16 = 25 = 5²). Field application: stretch a tape 6 ft along one wall, 8 ft along the other, then verify the diagonal is exactly 10 ft (a 6-8-10 triangle, a multiple of 3-4-5). Adjust the wall until 10 ft hits exactly — the corner is square. Used to square foundation forms, deck posts, and partition layouts. The framing square has stair tables and brace tables that extend this principle to common rafter + stringer layout.

     Reference: NCCER 27106 Geometry + Right Triangles

   Practice questions (2)

   1. 1. A floor plan is drawn at 1/4" = 1'-0". On the plan, a wall measures 5 inches. The actual wall length is:

      • A.5 ft
      • B.15 ft
      • C.20 ft✓ correct
      • D.25 ft

      1/4" represents 1 foot, so 1" represents 4 feet. 5 inches × 4 ft/in = 20 ft. The 15 ft and 25 ft distractors come from misreading the scale (3 ft/in or 5 ft/in). The 5 ft answer is dimensionally wrong — it would be reading the plan AS-IS rather than scaling.

   2. 2. A foundation form is staked out 12 ft on one side and 16 ft on the adjacent side. To verify the corner is square, the diagonal should measure:

      • A.18 ft
      • B.20 ft✓ correct
      • C.22 ft
      • D.24 ft

      12-16-20 is a multiple of the 3-4-5 right triangle (×4). Verify: 12² + 16² = 144 + 256 = 400 = 20². If the diagonal is anything other than 20 ft, the corner is not square. 18, 22, and 24 ft would all indicate a parallelogram — adjust the form until the diagonal hits 20 ft exactly.

3. 03Floor systems (Modules 27108, 27201)

   ~105min

   Sill plates, rim joists, floor joists, subfloor. The order of operations from bolt-down to plywood, and the joist tables that determine how big a span you can frame.

   • Sill plates + rim joists

     After the foundation cures, the SILL PLATE (also called mudsill) is bolted down to the top of the foundation wall — pressure-treated 2x6 (or 2x8) anchored with 1/2" anchor bolts cast into the foundation, sized per IRC R403.1.6 (typically 6 ft on center, with anchors within 12" of every plate end). A SILL SEALER (closed-cell foam strip or termite-treated foam) goes between the foundation and the sill to break thermal + air bridge. The RIM JOIST (or band joist) is set on top of the sill, perpendicular to the floor joists, capping the joist ends. Rim joist nailing: 16d at 6" oc face-nailed to each joist end. The sill+rim assembly is the foundation of all framing above it — out-of-square here cascades through the entire structure.

     Reference: NCCER 27108 Sill Plates + Rim Boards

   • Floor joists — span tables + bridging

     Floor joists carry the live + dead floor load to the foundation walls or interior beams. SPAN = clear distance between supports, NOT the length of the joist. IRC Tables R502.3.1 list maximum spans by lumber species, grade, joist size, and spacing. Examples (40 psf live load, 16" oc, #2 SPF): 2x8 = ~12'-7"; 2x10 = ~16'-1"; 2x12 = ~19'-6". Engineered I-joists span farther for the same depth. JOIST SPACING: 16" oc standard, 24" oc allowed for some applications with thicker subfloor. BRIDGING (cross-bracing or solid blocking) at midspan when joist depth-to-thickness exceeds 6 to 1 (most 2x10 and 2x12). HOLES + NOTCHES per IRC R502.8: holes ≤ 1/3 joist depth, no closer than 2" to top/bottom edge; notches in middle third of span are forbidden.

     Reference: NCCER 27201 Floor Framing

   • Subfloor — thickness + nailing

     Subfloor: 3/4" T&G plywood or OSB rated SHEATHING, 4x8 sheets installed perpendicular to the joists with the long edge bridging at least 3 joists. STAGGER end joints by at least one joist (no full-row break at the same line). Nailing pattern: 8d ring-shank or 10d common nails, 6" oc on edges, 12" oc in field. Glue + screw is best practice for the modern home — construction adhesive (PL Premium or similar) on every joist top + 2-1/2" deck screws or ring-shank nails — eliminates squeaks and increases stiffness ~30%. Allow 1/8" gap at panel ends per APA recommendation; IRC requires the panels to be SUPPORTED and BLOCKED at all unsupported edges.

     Reference: IRC + APA IRC R503.2; APA Engineered Wood Construction Guide

   Practice questions (2)

   1. 1. Per IRC R403.1.6, anchor bolts in a sill plate must be installed at maximum spacing of:

      • A.4 ft on center
      • B.6 ft on center✓ correct
      • C.8 ft on center
      • D.10 ft on center

      IRC R403.1.6: anchor bolts at 6 ft on center maximum, with at least one bolt within 12 inches of each end of every plate piece, and at least 2 bolts per plate piece. 4 ft is tighter than required. 8 and 10 ft exceed code and produce a sill plate that lifts in high-wind events. High-seismic and high-wind regions often have prescriptive requirements tighter than 6 ft (4 ft typical SDC D).

   2. 2. A 2x10 #2 SPF floor joist at 16" o.c. and 40 psf live load can span approximately:

      • A.12 ft
      • B.14 ft
      • C.16 ft✓ correct
      • D.18 ft

      ~16 ft (IRC R502.3.1(2)). 12 ft and 14 ft are conservative under-estimates. 18 ft exceeds the table value and risks deflection / serviceability issues. Always confirm with the actual table for the lumber species, grade, and load — the 2-deep × 10-wide × 16-foot common case is a useful baseline to remember.

4. 04Wall + roof framing (Modules 27109, 27202-27205)

   ~150min

   Wall plates, studs, headers, trimmers, kings + jacks. Then ceiling joists, common rafters, and the framing-square method for cutting a common rafter.

   • Wall framing anatomy

     Standard wall section: BOTTOM (sole) PLATE 2x4 or 2x6; STUDS 2x4 or 2x6 at 16" oc (or 24" oc for advanced framing); TOP PLATE doubled (2 plies of 2x4/6 with the upper plate offset to lap the lower plate at corners + intersections). 8 ft pre-cut studs are 92-5/8" — yielding an 8'-1-1/8" wall height with the bottom plate + double top plate accounted for. HEADERS over openings: doubled 2x lumber on edge (doubled 2x4, 2x6, 2x10, 2x12 — sized per opening width per IRC R602.7) with king studs (full-height) on each side and TRIMMER (jack) studs supporting the header underneath. CRIPPLE STUDS fill the space below the sill of windows and above the header. Walls are framed FLAT on the deck, then sheathed and tilted up — tilt-up walls are standard residential practice.

     Reference: NCCER 27109 Wall Framing

   • Header sizing — IRC R602.7

     IRC Table R602.7(1) sizes headers in load-bearing walls by opening span, building width, and load condition. Examples (interior bearing, 2 floors above, light snow): 4 ft opening = 2-2x6; 6 ft = 2-2x10; 8 ft = 2-2x12 with extra trim studs. EXTERIOR walls of single-story homes carry roof load only and use smaller headers. Trimmer count rises with span: 1 trimmer per side for ≤ 4 ft, 2 trimmers per side for 6-10 ft, 3 for wider. NON-BEARING walls allow much smaller headers (single 2x4 flat plate is sometimes acceptable). Always check the structural drawings BEFORE assuming a wall is non-bearing — interior walls perpendicular to ceiling joists usually carry load.

     Reference: IRC R602.7 Headers in Load-Bearing Walls

   • Common rafter — rise, run, span

     Roof framing terminology. RISE = vertical height from top plate to ridge. RUN = horizontal distance from outside of top plate to ridge centerline (HALF the building width for a symmetric gable). SPAN = total horizontal distance the rafter covers (usually = building width). PITCH = rise per 12" of run, expressed as "X-in-12" (a 6-in-12 pitch rises 6" for every 12" of run; that's a ~26.6° angle). LINE LENGTH of a common rafter (theoretical, before tail/seat cuts) = √(rise² + run²) — a 6-in-12 roof with 12 ft run has line length √(6² + 12²) per foot = √180/12 = 13.42 ft per foot of run × 12 = 13.42 ft. Use the framing square stair-table to look up rafter line lengths in inches per foot of run for any pitch.

     Reference: NCCER 27205 Roof Framing

   • Rafter cuts — plumb, seat, tail

     Three cuts make a common rafter: PLUMB CUT (top, where it meets the ridge — vertical when the rafter is in place); SEAT CUT (bird's-mouth notch where the rafter sits on the top plate — a horizontal cut + a plumb cut forming a notch); TAIL CUT (bottom, defines the eave — plumb, level, or square depending on soffit + fascia detail). Use the framing square: for a 6-in-12 pitch, the square is held with the body at 12" and the tongue at 6"; you mark along the body for the LEVEL line (seat cut horizontal) and along the tongue for the PLUMB line (vertical at top, vertical at tail if plumb-cut tail). The seat cut MUST NOT exceed 1/3 of the rafter depth (IRC R802.5) — over-cutting weakens the rafter at its bearing point and is one of the most common framing errors.

     Reference: IRC R802.5 Rafter Notching

   Practice questions (2)

   1. 1. A standard 8'-0" finished wall in a single-story residence uses a pre-cut 92-5/8" stud and:

      • A.A single bottom plate + single top plate
      • B.A single bottom plate + DOUBLE top plate✓ correct
      • C.A double bottom plate + single top plate
      • D.A double bottom plate + double top plate

      Standard residential framing: SINGLE bottom plate + DOUBLE top plate, with the studs pre-cut to 92-5/8". 92-5/8 + 1.5 (bottom) + 1.5 + 1.5 (double top) = 97-1/8" ≈ 8'-1-1/8" — wall is built slightly tall to accommodate finish floor and trim. Double bottom plates are not standard. Single top plates are uncommon (allowed under advanced framing only with specific tie-down details).

   2. 2. Per IRC R802.5, the maximum depth of a bird's-mouth seat cut on a common rafter is:

      • A.1/4 of the rafter depth
      • B.1/3 of the rafter depth✓ correct
      • C.1/2 of the rafter depth
      • D.2/3 of the rafter depth

      IRC R802.5: the seat cut may not remove more than 1/3 of the rafter depth. Cutting deeper compromises the bending strength at the bearing point — the most-stressed section of the rafter. 1/4 is conservative and acceptable; 1/2 and 2/3 are violations. Engineered rafters (LVL, I-joist) often have stricter manufacturer rules.

5. 05Exterior finishing (Modules 27206, 27207)

   ~75min

   Sheathing wrap, siding (vinyl, fiber-cement, wood), soffit, fascia, drip edge. The water-management chain from cap flashing to ground.

   • Water management — the WRB chain

     Water management is THE design problem of an exterior wall. The chain from outside in: SIDING (sheds bulk water + wind), DRAINAGE GAP (rain screen, where present), WEATHER-RESISTIVE BARRIER (WRB — Tyvek, Typar, Zip System integrated WRB; lapped shingle-style with upper layers OVER lower), SHEATHING (OSB or plywood, structural), FRAMING (with insulation in cavity), INTERIOR VAPOR CONTROL (varies by climate). PENETRATIONS: every nail, screw, vent, window, and door is a potential leak path; flash with appropriate flashing tape (3M 8067, ZIP tape) and integrate the flashing with the WRB so water flows OUTBOARD of the WRB at all times. The KICK-OUT FLASHING at the roof-wall intersection where a roof meets a sidewall above another roof is the single most-failed flashing detail in residential — IRC R703.2 explicitly requires it.

     Reference: IRC R703 Exterior Walls + Weather-Resistive Barriers

   • Siding types + installation

     VINYL SIDING: lap-style with overlap of 1" minimum at joints, fastened with hot-dipped galvanized roofing nails in slotted holes — DO NOT NAIL TIGHT (vinyl expands/contracts ~1/2" over a 12 ft run; tight nails crack the panel). FIBER-CEMENT (HardiePlank): pre-primed lap siding, fastened with corrosion-resistant nails or screws, lapped 1-1/4" minimum, butt joints staggered. Cuts produce silica dust — wear N95 + collect dust at the saw. WOOD CLAPBOARD: cedar, redwood, or pre-primed pine; lapped per spec, blind-nailed when shiplap pattern allows. ENGINEERED WOOD (LP SmartSide): treated OSB siding, cheaper than fiber-cement, lighter, easier to work but requires complete edge sealing on cuts. Each material has its own headlap, end-lap, and fastening requirements — read the manufacturer instructions, they govern over generic IRC.

     Reference: NCCER 27206 Siding Installation

   • Soffit + fascia + drip edge

     The eave assembly: FASCIA = vertical board nailed to the rafter tails; SOFFIT = horizontal underside of the eave overhang covering the gap between fascia and wall; DRIP EDGE = metal flashing at the roof edge that drives water onto the shingle and off the fascia. Standard fascia is 1x6 or 1x8 cedar/pine — primed both sides before install; modern composite (Azek, Boral) lasts decades without paint. Soffit is usually vented (perforated vinyl panels, hardboard with vent strips, or continuous open-web aluminum vent) to admit air to the attic vent path. VENTILATION RULE per IRC R806: 1 sq ft of net free vent area per 150 sq ft of attic floor (1:150) OR 1:300 with specific balanced intake/exhaust. Soffit ventilation is typically the INTAKE side; ridge or gable vents are the EXHAUST.

     Reference: IRC R806 Roof Ventilation

   Practice questions (2)

   1. 1. When installing vinyl siding, fasteners should be:

      • A.Driven flush against the panel
      • B.Driven 1/32" to 1/16" loose to allow thermal expansion✓ correct
      • C.Driven in only at panel ends
      • D.Replaced with adhesive

      Vinyl siding expands and contracts roughly 1/2" over a 12 ft run with temperature swing — it MUST hang loose on its slotted nail holes, with the head 1/32" to 1/16" off the surface. Driving tight (option A) cracks panels. Nailing only at ends (option C) lets the middle sag. Adhesive (option D) traps moisture and isn't the manufacturer's spec. The rule of thumb: you should be able to slide the panel back and forth slightly after fastening.

   2. 2. Per IRC R806.2, attic ventilation requires net free vent area of at least:

      • A.1 sq ft per 50 sq ft of attic
      • B.1 sq ft per 150 sq ft of attic✓ correct
      • C.1 sq ft per 500 sq ft of attic
      • D.1 sq ft per 1000 sq ft of attic

      1 sq ft per 150 sq ft of attic floor area (IRC R806.2), or 1:300 with balanced intake (50% within 3 ft of the ridge and 50% near the eave). 1:50 is much tighter than required. 1:500 and 1:1000 are below code. Inadequate ventilation produces condensation in winter, ice dams, and shortens roof life.

6. 06Stairs, drywall, cabinetry (Levels 3 + 4 overview)

   ~60min

   Late-curriculum modules — what to expect at Level 3 and 4. Stair stringer layout, drywall installation + finishing, cabinet hanging.

   • Stair stringer layout — IRC R311.7

     IRC R311.7 stair geometry: maximum RISER height 7-3/4"; minimum TREAD depth 10". The 7-11 standard (7" riser, 11" tread) is comfortable. Variation between any two risers ≤ 3/8" (the eye notices anything more — and trips). HEADROOM 6'-8" minimum measured from the nose of the tread to any obstruction above. HANDRAILS: 34"-38" above tread nosing, on at least one side of any flight with 4 or more risers. CALCULATING STRINGER LAYOUT: divide total rise (floor-to-floor or floor-to-deck) by 7-3/4 to find the minimum riser count, then divide actual rise by that count to find the actual riser. Multiply tread × (riser count - 1) to find the run. Mark the stringer with a framing square set to the riser/tread (e.g., 7" tongue, 11" body), step it down the stringer, and connect cuts. Square the stringer's bottom for the floor and remove the bottom riser depth to keep first riser height equal.

     Reference: IRC R311.7 Stairways

   • Drywall installation + taping

     Drywall (gypsum board) installs HORIZONTALLY with the long edge perpendicular to studs/joists for residential walls — produces a stronger panel + fewer butt joints. Fasteners: 1-1/4" coarse-thread drywall screws (not nails — nails pop), 16" oc on field, 8" oc on edges. Joints: TAPE + 3 COATS of joint compound. First coat (taping) embeds paper tape in compound; second coat (block coat) widens the seam to about 8"; third coat (skim) feathers it to a 12" wide invisible blend. Sand between coats with 220-grit. Outside corners use METAL CORNERBEAD or paper-tape with metal core. Inside corners use folded paper tape. ESTIMATE: 1.5 lb of compound per square foot of board; 1 roll of paper tape per 100 sq ft. Drywall finishing is one of the slowest carpentry skills to develop — 5+ years to consistently produce a Level 5 finish.

     Reference: NCCER 27308 Drywall Installation

   • Cabinet installation — uppers, base, fillers

     Order of operations: (1) locate studs + mark with horizontal layout line at the BOTTOM of the upper cabinets (54" from finished floor is standard kitchen height); (2) install uppers FIRST, working corner-out, with 2-1/2" cabinet screws into studs through the cabinet hanging rail; (3) install base cabinets, scribed and shimmed level (use a 4 ft level + shims under the toe-kick); (4) install fillers + crown molding last. Plumb + level discipline: an out-of-level upper run shows in the doors when they swing. Lay the level on the cabinets, set them dead level even if the floor isn't — the eye accepts a slight wedge at the toe-kick more readily than a tilted door reveal. SCRIBING: rip a piece to follow the wall's contour using a compass + jigsaw — the only way to make a square cabinet meet a non-square wall.

     Reference: NCCER 27407 Cabinetry

   Practice questions (2)

   1. 1. Per IRC R311.7, the maximum riser height in a residential stair is:

      • A.7 inches
      • B.7-3/4 inches✓ correct
      • C.8-1/4 inches
      • D.9 inches

      IRC R311.7: 7-3/4 inches max riser, 10 inches min tread. 7" is comfortable but not the code limit. 8-1/4" and 9" exceed code. The 7-11 ratio (7" riser × 11" tread) is the comfort sweet spot many builders target deliberately.

   2. 2. A standard upper-cabinet bottom in a kitchen is typically installed at what height above the finished floor?

      • A.42 in
      • B.48 in
      • C.54 in✓ correct
      • D.60 in

      54" from finished floor to bottom of upper cabinet is the residential standard — yielding 18" clear between countertop and upper cabinet (assuming a 36" countertop). 42 and 48" produce a kitchen that feels claustrophobic; 60" is too tall for most reach. Custom layouts vary, but 54" is the default for code drawings and prefab cabinet specs.

External resources

• Official
  NCCER Carpentry Curriculum + National Registry ↗

  Official program page for the NCCER Carpentry curriculum. Lists module codes, level breakdowns, the Trainee Guide editions, and the National Registry where completed module credits are tracked. Confirm your training program is an NCCER-accredited Sponsor — only Sponsors can issue Registry credit.

• Official
  International Residential Code (IRC) — current edition ↗

  The IRC governs one- and two-family dwellings and is the technical basis for most residential carpentry. NCCER modules cite IRC sections heavily. Free read-only access via ICC; many programs supply a printed copy with the Trainee Guide.

• Third-party
  APA Engineered Wood Construction Guide ↗

  APA — The Engineered Wood Association publishes free engineered-wood and panel-product guides covering APA-rated sheathing, I-joist span tables, glulam beams, and structural-composite-lumber installation. The single best free reference for floor and roof framing decisions in the field.