Panel Glossary

A-A: sanded plywood panel witb A-grade face and back plies and D-grade inner plies, bonded with interior or exterior glue.

A.A Exterlor: exterior-type sanded plywood panel witb A-grade face and back plies, C-grade inner plies, bonded with exterior glue. Exterior or high moisture applications.

A-B: sanded plywood panel witb A-grade face, B-grade bach Dgrade inner plies, bonded with interior or exterior glue.

A-B Exterlor: sanded plywood panel with A-grade face, B-grade back, C-grade inner plies, bonded with exterior glue.

A-C Exterlor: sandedplywood panel, A-grade face, C-grade back and C-grade inner plies, bonded with exterior glue. High moisture applications where appearance of only one side is important.

A-D: sanded plywood panel, A-grade face, D-grade back, Dgrade inner plies, bonded with interior or exterior glues, interior or protected applications where appearance of only one side is important.

APA Performance Rated Panels: panel products (Rated Sheathing, Rated Sturd-I-Floor and Rated Siding) designed and manufactured to meet performance criteria for specific end-use applications. (see related story p. 13)

Backstamp: apprrcved agency mark on back of panel.

B-B: sanded plywood panel, B-grade face and back, D-grade inner plies, bonded with interior or exterior glue, Interior or protected utility uses.

B-B Exterlor: sanded plywood panel, B-grade face and back, Cgrade inner plies, bonded with exterior glue. Utility uses.

B-B Plyform: concrete fomr grade.

B-C Exterlor: plywood panel with sanded B-grade face, C-grade back, C-grade inner plies, bonded with exterior glue. Utility uses.

B-D: plywood panel with sanded B-grade face, D-grade back, Dgrade inner plies, interior or exterior glue. Utility uses.

Brushed: siding surface treatment.

Story at a Glance

Structural wood panel product terminology panel whose grain runs Composite Panel

... information about APA Performance Rated Panels, plywood siding, sanded grades, composite panels and grading.

C-D Plugged: touch sanded plywood panel with C-Plugged-gade face, D-grade back and inner plies, interior or exterior glue. Indoor. outdoor use.

Center: inner ply or plies of a plywood parallel with that of face and back plies.

Channel Groove: a siding texture.

Com-Ply@: APA composite panel tradename.

Compmlte Panel: veneerfaced panel, reconstituted wood core.

4-Ply Panel

Core: in conventional plywood, inner plies with grain running perpendicular to that of the outer plies. In composite panels, aiayerof re"onititrt"a *oo4. @ Core

Core Gap: open veneer joint extending through or partially through a plywood panel.

Crossband: veneer layers with grain direction perpendicular to that of the face plies.

Decorative Panel: plywood panel grade with rough sawn, brushed, grooved or striated face,

Delaminatlon: separation between plies or within reconstituted wood due to adhesive failure.

Edge Vold: a gap in panel edge.

Embossed: textued panel surface teatment.

Exposure Durablllty Classlfication: indicates use and durability, Exterior (waterproof), Exposure I (waterproof, but not a substihrte for exterior), Exposure 2 (protected) or Interior.

Exterior Glue: a 1007o waterproof adhesive used to bond all Exterior, Exposure I and most Interior panels.

Exterlor Type: plywood manufactured for pemranent outdoor or marine use.

Face: highest-grade side of any veneer-faced panel with outer plies of different veneer grades or either side of a panel with outer plies of same grade.

Face Grain: direction of grain of outer ply of a veneer-faced panel in relation to its supports.

Flre-Retardant-Treated (FRT): chemical treatment of wood and plywood to retard combustion.

Glueline: adhesive joint formed between veneers in a plywood panel or between face veneers and core in a composite panel.

Groove: textured plywood surface treatment, lnner Plies: all plies of a plywood panel except face and back.

Group Number: a classification of I to 5 according to strength and stiffness of the species used !o manufacture plywood.

Hlgh Denslty Overlay (HDO): Exterior-type plywood with a resin-impregnated fi ber overlay.

Interior Glue: moisture-resistant but not waterproof adhesive.

F F

Jolnted Core: core veneer has edges macbined square.

Knothole: void produced when a knot drops out of veneer.

Layer: one or more adjacent plies having wood grain in same direction.

Lay-Up: stacking of veneers or reconstituted wood layers in complete panel "press loads" after gluing and before pressing a structural wood panel.

Lumber Core: plywood manufactured with a core of lumber strips.

Marlne Grade: plywood panels meeting marine use criteria.

Medlum Denslty Overlay (MDO): Exterior plywood with an opaque resin-treated fiber overlay.

Noncertifled: not covered by product or perfomrance standards.

Open Defects: irregularities in veneer.

Orlented Strand Board (OSB): shuctural wood panels manufactured from reconstituted, mechanically oriented wood strands bonded with resins under beat and pressure.

Overlald Plywood: factory-applied, resin-treated fiber faces on one or both sides.

P & TS: plugged and toucb-sanded face of a plywood or composite panel.

Peeler Log: softwood log used to produce veneers.

Performance Standard: APA performance criteria.

Plastlc Overlay: see Medium Density Overlay and High Density Overlay.

Plug: see Repairs.

Plugged Core: inner ply construction of solid CPlugged-grade veneer pieces.

Plugged Crossbands Under Face (PCUF): a sanded panel for underlayment.

Ply: a single veneer in a panel.

Plyron: plywood panel manufactured with a hardboard face.

Preflnlshed: a ready-touse panel with factoryapplied finish.

Preprlmed: panel with factory-applied primer or undercoat.

Types of Repairs

Boat Patch

Product Standard: industry product manufacturing or performance specification.

Racklng Reslstancr: ability to resist forces in the panel's plane tending to distort its rectangular shape.

Repalrs: patcb, plug or shim in veneer.

Reverse Board and Batten: siding surface treatment.

Rough Sawn: decorative siding heatment.

Sanded Panels: factory-sanded Interior or Exterior plywood paneIs.

Sandwlch Panel: panel witb higb strength plywood faces (skins) attached to both sides of low density core materials such

Panel as plastic foam or honeycomb paper fillers.

ScarfJoint: angled or beveledjoint in plywood splicing pieces togetber.

Shop Cuttlng Panel: panel not meeting Product Standard grade requirements.

Stitching: temporarily sewing thin strips of veneer into sheets before laminating into panels.

Stressed$kln Panel: engineered stuctural panel assembly. For roofdeck or floor applications.

Structural I: unsanded grade for use where shear and cross panel strength is of maximum importanc€.

Telegraphlng: grain or defects show through on a smooth overlaid plywood panel surface.

Rouler Patch

Texture 1-11: APA special rated siding panel tradename.

Textured Plywood: machined textured surface.

Touch-Sanded Panels: sbuctural wood panels sized to unifomr thickness by light surface sanding during manufacture.

Circular Plug

Underlayment Grade: PSl designated, touch-sanded Interior panels designed as a base for finish flooring.

Unsanded Panels: Interior or Exterior sheathing grade panels for utility applications.

Sled Patch

Dogbone Plug

Veneer Grade: a thin sheet of wood laminated with others under heat and pressure to form plywood or used for faces of composite panels. Also called ply.

Veneer Grade: standard grade designation of softwood veneer used in panel manufacture.

Vold: See Core Gap.

Waferboard: manufactured from reconstituted wood wafers.

Wood Foundation: a residential and light frame foundation system utilizing pressure heated plywood panels and wood fraadng. Commonly known as the Permanent Wood Foundation (PWF).

Source: APA Panel Handbook & Grade Glossam - Hitor.