Part III · How it is built · Chapter 12
Edges, faces and grain
Exposed, semi-exposed and concealed surfaces, edge banding types and thicknesses, veneer cuts and matching, and how solid timber moves, from the standard and the Wood Handbook.
13 min read
Every surface in a cabinet has a category, and the category sets its material, its finish and its price. The visible edge is where cheap work shows first. Grain is where good work shows first. A drawing that does not say which surface is which, what covers each edge, and which way the grain runs has left three decisions to the cut list.
Surface categories, edge rules and veneer matching come from the Architectural Woodwork Standards (AWS), 2nd Edition, Sections 4 and 10, whose full text the Woodwork Institute hosts. Later editions exist (chapter 19). Edge banding tolerances come from Egger's technical data sheet for its ABS edging. Timber movement comes from the USDA Wood Handbook, FPL-GTR-190.
Four surface categories
The AWS sorts every cabinet surface into four categories (Section 10, rule 10.4.4, 7). Learn them by position, because the standard defines several by height above the finished floor.
| Category | Definition | Includes |
|---|---|---|
| Exposed exterior | "all exterior surfaces exposed to view" | Everything visible with doors and drawers closed, including knee spaces. Undersides of cabinet bottoms more than 42" (1067 mm) above the floor, including behind light valances. Cabinet tops under 80" (2032 mm) above the floor, or higher if seen from an upper level. Front edges of stretchers, ends, divisions, tops and bottoms. Visible sloping tops |
| Exposed interior | "all interior surfaces exposed to view in open casework or behind transparent doors" | Shelves with their banding. Divisions and partitions. Inside faces of ends, backs and bottoms. Cabinet top members 36" (914 mm) or more above the floor. Inside faces of doors and applied drawer fronts |
| Semi-exposed | "interior surfaces only exposed to view when doors or drawers are opened" | Tops and bottoms of shelves (front edge counts as exposed). Inside faces of ends, backs and bottoms. Drawer sides, sub-fronts, backs and bottoms. Undersides of cabinet bottoms 24" to 42" (610 to 1067 mm) above the floor. Security and dust panels, drawer stretchers |
| Concealed | "covered or not normally exposed to view" | Toe space, unless specified. Sleepers, stretchers, solid sub-tops. Undersides of cabinet bottoms under 24" (610 mm). Flat tops of cabinets 80" (2032 mm) or more up, unless seen from above. The three hidden edges of adjustable shelves. The faces of cabinet ends that butt together |
Two rules on top of the definitions change what a drafter draws. Surfaces behind presentation panels, such as whiteboards, count as semi-exposed at Economy and Custom Grade and exposed at Premium (AWS 10.1, 14.11). And storage, janitor's closet and utility room cabinets default to Economy Grade whatever the rest of the project is (14.10).
Why the category decides cost
Each category allows a different set of materials at each grade. For wood casework the AWS allows, among others (rule 10.4.5, 9):
| Surface | Economy | Custom | Premium |
|---|---|---|---|
| Exposed exterior, opaque finish | Particleboard, MDF, MDO, softwood or hardwood plywood, solid stock | MDF, MDO, close-grain hardwood plywood, solid stock | MDF and MDO |
| Exposed interior, transparent finish | LPDL or wood of the manufacturer's choice | Wood of the same species as the exterior; HPVA Grade B | Same species and cut as the exterior; HPVA Grade A |
| Semi-exposed | Solid wood, veneer of the manufacturer's choice, MDO, MDF, particleboard or LPDL | Solid wood, veneer of minimum HPVA Grade C, or LPDL | Solid wood or veneer of minimum HPVA Grade C, compatible species to the exposed |
| Concealed | Manufacturer's choice at all grades | ||
So one line on the drawing, "semi-exposed: white melamine", can take a cabinet interior from veneer to melamine. That line is a price. The Woodwork Institute sample writes every category out on its specification sheet: SEMI-EXPOSED: WHITE MELAMINE, EXPOSED INTERIOR: WHITE MELAMINE, EXPOSED FACE: HIGH PRESURE PLASTIC LAM. The residential submittal in hand says it on the section: MAPLE INTERIORS STAINED TO MATCH EXPOSED SURFACES.
Heights matter because the category moves with them. Worked example: a wall cabinet hung with its bottom at 54" above the floor has an exposed-exterior underside, and needs the face material there. Drop the same cabinet to 40" above a desk, and its underside becomes semi-exposed. Move the cabinet in revision and the finish schedule has to follow.
Edges
A sheet's edge shows its core. The AWS defines edgebanding as the "method of concealing plies or inner cores of plywood or particleboard when edges are exposed", notes that "thickness or configuration will vary with manufacturers' practices", and draws the range as 0.017" to 0.118" (0.45 mm to 3 mm) (Section 10, construction detail nomenclature).
The edge types a drawing names
| Edge | What it is | Where the AWS draws or rules on it |
|---|---|---|
| Thin applied band | Veneer, PVC, ABS or HPDL strip on the edge | "Square edge with thin applied edgeband" (door and front profiles) |
| Thick applied band | Solid timber or thick plastic, square or radiused | "Square edge with thick applied edgeband"; "Radius edge with thick applied edgeband" |
| Inset band | Solid timber let into the core before the face veneer goes on | "Square edge with inset edgeband"; "Lipped edge with inset edgeband" |
| Self edge | Laminate on the edge, cut from the same sheet as the face | The Woodwork Institute sample draws two sequences, below |
| Filled and sanded | No band; the edge is filled and painted | Wood casework, visible edges: "Voids to be filled and sanded" at Economy; sheet products banded at Custom and Premium (rules 27.1.1, 27.1.3) |
Inset solid edging carries its own warning in the standard: "To prevent telegraphing, inset solid wood edging when used must have similar moisture content as panel core, be glued securely and calibrated with panel core thickness prior to being laminated with a wood veneer on both faces" (AWS 10.1, 13).
The order of lamination
When a laminate-faced part has a laminate edge, one of the two goes on first, and the one on top hides the other's edge line. The Woodwork Institute sample makes the grade difference visible on its detail-standards sheet for countertop edges:
- SELF EDGE ON FRONT EDGE (CUSTOM), marked SELF EDGE LAST. The edge strip goes on after the top and covers the top laminate's edge, so the strip's own core line runs along the top surface.
- SELF EDGE ON FRONT EDGE (PREMIUM), marked SELF EDGE FIRST. The top laminate goes on after the strip and runs over it, so the top surface is unbroken and the line shows on the front face instead.
The AWS makes the sequence the manufacturer's choice unless specified (rules 27.1.4 and 28.1.1), and for wood casework adds one rule: "At the ends of wall hung cabinets, the sequence of edges shall be the bottom edge first" (27.1.5.1). If the designer cares which line shows, the drawing has to say.
Edge rules worth putting on the sheet
From AWS Section 10.4.7, assembly rules:
- At adjustable shelves, only the front edge is banded (6.1). If the gap between a shelf end and the cabinet side exceeds 1/4" (6.4 mm), both ends are banded, Custom and Premium (16.9.2.1).
- The bottom edge of upper cabinet ends is banded (6.2). The top edge of ends, where visible from above, is banded to match the exposed exterior, Custom and Premium (6.3).
- Edgebanding runs "parallel to the long direction of the edge regardless of grain and/or pattern" (6.4).
- Dadoes and lock joints "shall not run through the edgeband", Custom and Premium (6.5). Draw stopped dadoes where a banded edge shows.
- Tee banding "must be so specified" (6.6).
- Bottom edges of drawer fronts and aprons at knee spaces are banded, Custom and Premium (5).
- For wood casework, door and drawer front edges showing more than 1/4" (6.4 mm) on the face are mitred at Premium (27.1.5).
- For decorative laminate casework, HPDL or PVC edges run from 0.018" (0.5 mm) to 0.12" (3 mm), and "PVC and ABS edgebanding thicker than 0.04" (1 mm) be radiused on edges and corners" (28.1.2, 28.1.3).
Banding as a manufactured product
Plastic banding comes off a roll with its own tolerances. Egger's data sheet for its ABS edging lists widths from 0.472" to 2.126" (12 to 54 mm) at ±0.018" (±0.45 mm), and thickness tolerances by band:
| Band thickness | Tolerance |
|---|---|
| Up to 0.039" (1.0 mm) | +0.005 / −0.003" (+0.15 / −0.10 mm) |
| 0.043–0.079" (1.1–2.0 mm) | +0.003 / −0.007" (+0.10 / −0.20 mm) |
| 0.083–0.118" (2.1–3.0 mm) | +0.005 / −0.010" (+0.15 / −0.25 mm) |
The same maker's processing instruction says ABS edging "is not suitable for cold glue activation processes using white PVA glue", gives the optimum board moisture as 7% to 10%, and asks for edging and boards to be conditioned at 18–24 °C before processing. A drafter does not set the edgebander. The drafter does set the band: material, thickness, colour code and which edges get it. A band thickness also changes a finished dimension, so the cut list and the drawing need the same number.
The AWS machining rules set how cleanly the band is trimmed. HPDL, PVC and prefinished wood edges "shall be machined flush and filed, sanded, or buffed", with overlap limited to 0.005" (0.13 mm) for a maximum 1" (25.4 mm) length in any 24" (610 mm) run at Custom Grade, and chip-out inconspicuous at 48" (1220 mm) viewing distance for Custom and 24" (610 mm) for Premium (rule 10.4.6, 1.2).
Faces: veneer cut and match
A veneered face is a sequence of thin leaves sliced from one log. The AWS explains why the order matters: the leaves "are kept in the order in which they are sliced, thus permitting a natural grain progression" (Section 4, Veneer cutting).
Four cuts
| Cut | What it produces (AWS Section 4) |
|---|---|
| Plain (flat) sliced | "A combination of cathedral and straight grain patterns". "The slicing method most often used to produce veneers for architectural woodwork" |
| Quarter sliced | "A series of stripes". Fleck in red and white oak |
| Rift sliced | Cut "slightly off the radius lines minimizing the 'fleck'". Rift oak may still show flake on up to 25% of the surface (rule 4.4.5.9) |
| Rotary | Peeled like a roll of paper: "a generally bold random appearance" |
The standard adds a warning about solid trim: "rift veneers and rift sawn solid lumber are produced so differently that a 'match' between rift veneers and rift sawn solid lumber is highly unlikely". If an elevation shows rift oak panels framed in rift oak solid, expect a colour and figure question at sample stage (chapter 17).
Three levels of matching
Matching happens at three scales, and each has to be specified separately.
| Scale | Options (AWS Section 4) | Default |
|---|---|---|
| Between adjacent leaves | Book match (every other leaf turned over), slip match (leaves slid along without turning), random, end or butt match | Must be specified |
| Within one panel face | Running match, balance match, balance and center match, slip-center-book match | Running match for Custom Grade; balance match for Premium |
| Between panels | Not matched, sequence matched, sequence matched and custom width, blueprint matched | Sequence or blueprint only if specified |
Book matching has a known side effect. The AWS calls it the "barber pole" effect: the tight and loose faces of alternate leaves "may accept stain differently", which "may result in a noticeable color variation". It is "not a manufacturing defect". If a client will read stripes as a fault, say so at sample stage, not after install.
Grain layout by grade on doors and fronts
The AWS layout rules for doors and drawer fronts are the part of this chapter a drafter draws most often (AWS 10.1, 14.13):
- Stile and rail doors, all grades: doors vertical. Drawer fronts vertical or horizontal at the manufacturer's choice, the same for the whole project.
- Flush panel, Economy: doors vertical; drawer fronts either way for the whole project; "Mismatch is allowed".
- Flush panel, Custom: doors, drawer fronts and false fronts "run and match vertically within each cabinet unit".
- Flush panel, Premium: they run and match vertically "and be sequenced horizontally within each cabinet unit"; cathedral grain has "the crown ... pointing up and run in the same direction for the entire project"; faces are "well matched for color and grain across multiple cabinet faces in one elevation". Sequencing between cabinet units "must be so specified".
On the elevation, show grain direction with a grain arrow or hatch on at least one face per run, and number faces in sequence where sequence matching applies. The Woodwork Institute sample's specification sheet names both: GRAIN DIR. @ DWR. FACE: VERTICAL and GRAIN MATCH: YES. The AWS also sets the default for wall surfaces: "surfacing with a defined grain and/or pattern is installed vertically, unless otherwise specified" (AWS 10.1, 14.4).
Worked example: one sheet, one run
A Premium run of three flush doors, each 18" wide and 30" tall, faced in plain-sliced walnut. Vertical grain. The AWS layout rule wants the three faces sequenced across the unit. The size listing sets the grain: a 48" × 96" sheet has grain along the 96" length (Section 4, rule 4.1.7.1), so a 30" tall door stands with its height along the 96" direction, and three 18" widths (54") need more than one 48" sheet width. Only two 18" widths fit across one 48" sheet, so the third door breaks the horizontal sequence unless the shop buys sequence-matched panels or lays up faces to size. Each answer costs differently. The drawing asks the question by showing the grain direction and the sequence numbers. The shop answers it at nesting.
Solid timber moves
Sheet goods barely change width. Solid wood does, and the Wood Handbook gives the arithmetic. For moisture content between 6% and 14%, the change in dimension is:
ΔD = D × C × (Mfinal − Mstart)
where D is the width, C is the species' dimensional change coefficient (tangential CT for flat-sawn width, radial CR for quartersawn), and M is moisture content in percent (Equation 13-2, coefficients in Table 13-5).
| Species (Table 13-5) | CR radial | CT tangential |
|---|---|---|
| Red oak, commercial | 0.00158 | 0.00369 |
| White oak, commercial | 0.00180 | 0.00365 |
| Sugar (hard) maple | 0.00165 | 0.00353 |
| Black cherry | 0.00126 | 0.00248 |
| Black walnut | 0.00190 | 0.00274 |
How far does moisture content swing? The Wood Handbook's Table 13-2 recommends an average of 8% for interior woodwork in most of the United States, with individual pieces from 6% to 10%. In the dry southwest the average is 6%; in damp, warm coastal areas it is 11%.
Worked example: a raised panel
A door panel in flat-sawn red oak, 350 mm (13-3/4") wide, made at 6% and living at 10%: ΔD = 350 × 0.00369 × 4 = 5.2 mm. The same panel quartersawn: 350 × 0.00158 × 4 = 2.2 mm. Flat-sawn stock moves more than twice as much across its width.
That is why the AWS requires panels in stile and rail doors to "have the freedom and room to expand and contract in reaction to ambient humidity changes", whatever the retention method (rule 10.4.7, 8.11.2.6), and why sheet and laminated lumber panels "shall be allowed to move, float, expand or contract" (2.9). It is also why the standard caps edge-glued solid panels at 13-3/4" (350 mm) across the grain at Economy and Custom, and does not permit solid lumber panels at Premium (8.11.2.4.1, 8.11.2.5). On your section, draw the panel groove deeper than the panel edge and dimension the clearance. A panel drawn tight in its groove is a drawing of a split waiting for winter.
What to check before you issue
- Every surface in the finish schedule is tagged exposed exterior, exposed interior, semi-exposed or concealed.
- Undersides and tops are categorised by their actual height above the floor.
- Every edge that shows has a named band: material, thickness, colour, and which edges.
- Lamination sequence is stated wherever the designer cares which line shows.
- Veneer species, cut, leaf match, panel match and between-panel match are all stated, or stated as default.
- Grain direction and sequence numbers appear on the elevations.
- Solid timber panels have room to move, and the clearance is dimensioned.
Sources
- Architectural Woodwork Standards, 2nd Edition, 1 October 2014, © AWI, AWMAC, WI, full text hosted by the Woodwork Institute. Section 4, printed pp. 76–78 and 81–84 (veneer cutting, cuts, leaf, panel and between-panel matching, barber pole), 89 and 91 (grain direction by size listing, rift oak flake). Section 10, printed pp. 289 and 293 (edge profiles, edgebanding definition and range), 297 and 299–300 (telegraphing note, grain layout by grade, surfacing direction, presentation panels), 302–303 (surface categories), 306 (materials by surface and grade), 309–311, 315, 321, 325–326 (machining, edge, panel movement and laminate edge rules). Superseded for jobs bid under later editions; see chapter 19. Primary (superseded edition).
- USDA Forest Products Laboratory, Wood Handbook, FPL-GTR-190, Centennial Edition, April 2010. Chapter 13: Equation 13-2, Table 13-2 (recommended moisture content at installation), Table 13-5 (dimensional change coefficients). Primary.
- Egger, Technical datasheet, EGGER ABS Edge Banding, TD ABS US EN, revision 01, approved 1 Dec 2020 (egger.com). Width and thickness tolerances. Primary.
- Egger, Processing instruction, EGGER ABS Edging, revision 04, approved 6 Aug 2025 (egger.com). PVA unsuitability, board moisture, conditioning temperature. Primary.
- Woodwork Institute, Sample Shop Drawings, specification requirements sheet (surface lines, grain direction and match) and the detail-standards sheet (self edge first and last, custom and premium). Document.
- A residential millwork submittal, 16 sheets, revision 0, section sheets 09–14: the interior finish note. Not reproduced: live job. Document.
Left out for lack of a source I could open: which edge band thicknesses distributors keep on the shelf (Egger's sheets give tolerances by thickness band, not a stock list), and any cost figure for veneer matching.