2024年2月26日发(作者：)

Wood Grading RulesWhy have grading rules:1. Grading rules group flooring with similar qualities. This will give you a degree of consistency to productsfrom different mills.2. Gives the person purchasing the product the minimum expectations of products appearance. This wouldinclude surface characteristics, required lengths, and milling tolerances.3. These standards allow you have confidence in the product you are purchasing. Sample boards are generallyvery close to the product you will does this process work:The wood flooring industry has taken it upon themselfs to regulate the quality of the products produced. Thereare several different associations that have been formed. All of these associations have similar goals. The generalgoals of these associations include administering standards for the industry, performing quarterly mill inspections,promoting the industry, and gathering statistical information. Inspectors check for grade compliance, includingmilling, packaging length and acceptable moisture levels. Most of these associations promote educationprograms for installers and helpful literature for the public. Lumber mills join these associations to ensure thequality of their products will be comparable to other mills. Member mills will have a stamp on the bottom oftheir products or boxes. This indicates these products meet or exceed industry standards. Some of these selfregulating associations are: National Oak Flooring Manufacturers Association, , Maple FlooringManufacturers Association, , Canadian Lumbermen’s Association / . Softwoodflooring grades are established by the Southern Pine Inspection Bureau, Western Wood Products Association,and West Coast Lumber Inspection Bureau. If there were a question about the quality of the product received arepresentative of the company would come out to inspect the product and proceed with a suggested other cases wood flooring manufacturers determine their own lumber classifications and create their owngrades, or proprietary following will be a discussion of the general grading rules for solid oak and engineered oak. This will coverthree of the products shown in our area. These rules are taken directly from the NOFMA web page in part. Iwould like to thank the NOFMA for allowing us to copy the grading rules listed below from their web pages.

For the complete grading rules please visit the following location. /MA GRAIN DESCRIPTIONSOAKPLAIN SAWNQUARTER SAWNRIFT SAWNQUARTER/RIFT SAWN

PLAIN SAWN: flooring that is marked or specified as PLAIN SAWN or PLAIN, maycontain any combination of the following types of grain classification. Also, flooringwithout a grain designation may contain any combination of the types of grainclassification: Plain Sawn, Rift Sawn, and Quarter Sawn.

QUARTER SAWN: flooring that is marked or specified as QUARTER SAWN orQUARTERED; at least 50% of the piece must contain Quartered characteristics.

Quartered characteristics as defined by NOFMA are: In cross section the angle of theannual ring tangent to the face of the piece to be between 45° and 90°. Grain lines to bemostly parallel to the length of strips, and medullary ray flecks present and more than1/16" wide.

RIFT SAWN: Flooring that is marked or specified as RIFT SAWN or RIFT; at least75% of the piece must contain Rift characteristics.

Rift characteristics as defined by NOFMA are: In cross section the angle of the annualring tangent to the face of the piece to be between 30° to 60°. Grain lines to be mostlyparallel to the length of strips and medullary ray flecks less than 1/16" wide.

QUARTER/RIFT SAWN: Flooring that is marked or specified as NOFMAQUARTER/RIFT SAWN or QUARTER/RIFT, is a combination of QUARTER SAWNand RIFT SAWN developing from the production run.

OAK FLOORING GRADING RULES(NOTE: Characters included in a higher grade are automatically accepted in lowergrades.)

NOFMA CLEAR OAKA flooring product of mostly heartwood with a minimum number of character marks anddiscoloration, providing a uniform appearance while allowing for all heartwood naturalcolor variations.

Will admit the following: 3/8" bright sapwood entire length of strip or equivalent if notextending further than 1" for 1/3 length of piece; small burls and fine pin worm holes; andequivalent characters such as small tight checks; in the absence of these, one thin brownstreak 3" long to be allowed every 6'.

Standard Packaging - Bundles to be 1 1/4' and longer; Average length, bundled or nested,3 3/4'. Shorter Packaging - Average length for 7' and shorter packages, nested orotherwise, 3 1/2'.

NOFMA SELECT OAKA flooring product with coloration variations produced by differences of naturalheartwood and sapwood, along with characters described.

The face may contain: unlimited sound sapwood; slight imperfections in milling; a smalltight knot every 3'; pin worm holes; burls and a reasonable amount of slightly openchecks. Brown streaks should not extend the entire length of a piece. Two flag wormholes to every 8' are permitted. Slight imperfections in face work (torn grain) admitted.

An intermittent, brown machine burn across the face not exceeding 1/4" width , a slight quantity of bark on the back or sides admitted. Will admit pieces with 1/2tongue. Spot filling is generally required for open characters.

Standard Packaging - Bundles to be 1 1/4' and longer; Average length, bundled or nested,3 1/4'. Shorter Packaging - Average length for 7' and shorter packages, nested orotherwise, 3'.

NOFMA NO. 1 COMMON OAKA flooring product which contains prominent variations in coloration and varyingcharacters.

The following are not admitted: broken knots over 1/2" in diameter, large grub wormholes; and splits extending through the piece. Open characters such as checks and knotholes are admitted, but must be sound and readily fill. Not more than 20" scant stock inthickness allowed to every 5'. Minor imperfections in machining permitted. Shall admitsticker stain; varying wood characteristics, such as flag worm holes, heavy streaks,checks, and worm holes; and an occasional dark machine burn across the face notexceeding 1/2" wide, 1/64" deep and not more than two each 3'. 1/4 tongue ely dark pieces are not to be included.

Standard Packaging - Bundles to be 1 1/4' and longer; Average length, bundled or nested,2 3/4'. Shorter Packaging - Average length for 7' and shorter packages, nested orotherwise, 2 1/2'.

NOFMA NO. 2 COMMON OAKMay contain sound natural variations of the forest product and manufacturingimperfections. The purpose of this grade is to furnish a floor suitable for homes, generalutility use, or where character marks and contrasting appearance is desired.

The following are not admitted: shattered or rotten ends, large broken knots, excessivebad millwork, shake, advanced rot, and similar unsound defects. Dark machine burnsexceeding 3/64" deep not admitted. Knot holes and open characters which will readily fillare admitted. A limited number of pieces with no tongue which may be face nailed areadmitted.

Standard Packaging - Bundles to be 1 1/4' and longer; Average length, bundled or nested,2 1/4'. Shorter Packaging - Average length for 7' and shorter packages, nested orotherwise, 2'.

NOFMA 1 1/4' SHORTS OAKPieces 9" to 18" long are to be bundled together and designated as 1 1/4' Shorts. Piecesgraded NO. 1 COMMON, SELECT and CLEAR to be bundled together and designatedNO. 1 COMMON & BETTER with pieces grading NO. 2 COMMON bundled separatelyand designated as such. Although pieces 6" under and only 3" over the nominal length ofthe bundle may be included, the pieces must average 1 1/4', which is achieved through thenatural preponderance of longer lengths.

RETURN TO THE HOME PAGENOFMA: The Wood Flooring Manufacturers AssociationCopyright © 1997-2003. All Rights Reserved.E-Mail: info@1. NOFMA Select & Better Hickory / PecanShall have the face practically free of all defects, but the natural color of the wood shallnot be considered a defect. The highest standard grade, combines a nearly uniformappearance with exceptional durability.

The following characters are admitted: variations in the natural color of the wood,heartwood and sapwood: an occasional small, firm pin knot or bird peck, not over 1/8" indiameter, provided it does not occur on edges or ends of strips; dark streaks not over1/4" wide and 3" long (or its equivalent one for every 3 ft. in length); slight checks notover 1/2" long, provided check is boxed within the piece; small burls; slight torn grain orslight intermittent machine burn; or similar defect which can be readily removed by theordinary method of sanding the floor after it is laid; a slightly shallow place not over 12"long on underside of the flooring if it does not extend to either end of the piece. Pieceswith 1/2 tongue for no more that 25% of the length are allowed. The wood must be freeof shake. Bark streaks shall not be permitted.

Packaging: 8' or shorter, nested or bundled. Pieces/bundles shall be 1 1/4' andlonger through 7' or 8' as the stock will produce (9" Minimum, 102" Maximum).Average length 3 1/4'. Average length for 7' and shorter packages, nested orotherwise - 3'.

NOFMA #1 Common Hickory / PecanA floor with varying wood characteristics and colors to include heavy streaks, stainedsapwood, sound knots, checks and small splits. All defects must readily fill and be sound.

The following characteristics are admitted: broken knots up to 1/2" in diameter; distinctcolor variations (predominantly dark, discolored pieces not allowed); stickerstain/shadow; numerous dark streaks or black spots; checks to 1/16" not exceeding 3" inlength, and running parallel and well inside the strip edges; small end split 1/16" x 1/2"showing no movement; bird pecks to 1/2" where bark is sound and as hard assurrounding wood.

Minor imperfections in machining permitted; torn grain (less than 1/16" deep and 3" longfor full width); slightly torn edges, and an occasional dark machine burn 1/2" in width (1per 3').

Will admit pieces with 1/2 full tongue entire length of piece.

Packaging: 8' or shorter, nested or bundled. Pieces/bundles shall be 1 1/4' andlonger through 7' or 8' as the stock will produce (9" Minimum, 102" Maximum).Average length 2 3/4'. Average length for 7' and shorter packages, nested orotherwise- 2 1/2'.

NOFMA #1 Common & Better Hickory / PecanA combination of NOFMA Select and NOFMA #1 Commo developing from theproduction run. The lowest graded pieces allowed are NOFMA #1 Common.

Packaging: 8' or shorter, nested or bundled. Pieces/bundles shall be 1 1/4' andlonger through 7' or 8' as the stock will produce (9" Minimum, 102" Maximum).Average length 2 3/4'. Average length for 7' and shorter packages, nested orotherwise- 2 1/2'.

NOFMA #2 Common Hickory / PecanMust be of such character as will lay and give a good serviceable floor. The wood mustbe firm, and may contain defects of every character. This grade is intended to give a"rustic" appearance.

The following defects are not allowed: knot holes over 3/8" in diameter or unsound knotswhere the unsound portion is over 1" in diameter (the unsound portion can not extendthrough piece); shake, soft rot, splits and open defects which extend through piece orshow movement, torn grain more than 1/4" deep, edge splinters, and imperfections inmanufacture which would materially impair the serviceability of the floor.

Knot holes, bird pecks, worm holes, and the like which will readily fill are with 1/4 full tongue admitted.

Packaging: 8' or shorter, nested or bundled. Pieces/bundles shall be 1 1/4' andlonger through 7' or 8' as the stock will produce (9" Minimum, 102" Maximum).Average length 2 1/4'. Average length 7' and shorter packages, nested orotherwise- 2'.

NOFMA #2 Common & Better

A combination of NOFMA Select, NOFMA #1 Common, and NOFMA #2 Commondeveloping from the production run. The lowest graded pieces allowed are NOFMA #2Common.

Packaging: 8' or shorter, Nested or bundled. Pieces/Bundles shall be 1 1/4' andlonger through 7' or 8' as the stock will produce (9" Minimum, 102" Maximum).Average length 2 1/4'. Average length for 7' and shorter packages, nested orotherwise- 2'.SPECIAL GRADES

Hickory / PecanNOFMA Clear Red Hickory / PecanIs a special stock selected for its deep red/brown color with the minimal contrast of thelighter sapwood.

Face of pieces shall be heartwood (95%). All NOFMA Select Hickory / Pecan GradeRules apply.

NOFMA Clear White Hickory / PecanIs special stock selected for its creamy color with the minimal contrast of the darkerheartwood. The face of pieces shall be bright sapwood (95%). All NOFMA SelectHickory / Pecan Grade rules apply.

EXCEPTIONS: streaks should be light brown not over 1/4" wide and 3" long (orequivalent) one per 3'. black spots not allowed, sticker stain/shadow none allowed.

RETURN TO THE HOME PAGENOFMA: The Wood Flooring Manufacturers AssociationCopyright © 1997-2003. All Rights Reserved.E-Mail: info@INEERED HARDWOOD FLOORING1.

The NOFMA definition of Engineered

A product which is an assembly of multiple layers of hardwood veneer or dimensioned stock. The layersare kiln dried; assembled with opposing grain direction (cross-hatched); and bonded together to form asingle unit. The unit is milled on all edges and surfaced.

The engineered flooring product must be glued, stapled or nailed to a proper sub- strate, asrecommended (specified) by the ered flooring is a kiln dried product with an average moisture content between 5 and 11% MC at time ofshipment.

Edge configuration options include: a tongue and opposing groove; bevel edges and ends; bevel edges and non-beveled ends; and a fully jointed or square edge, with or without face bevels. Jointed or square edges are mostcom-mon with parquet units.

NOFMA members are required to mark their product with an identifying number/name and to identify the speciesof the face veneer.

Products may include strip, plank, and parquet, both unfinished and factory ENGINEERED FLOORING UNFINISHED GRADESGRADING RULES1. NOFMA SELECT & BETTER ENGINEERED - OAKAn engineered flooring product with col-oration variations produced by differences of natural heartwood andsapwood along with characters and other color variations described.

The face may contain the following speci-fied characters and equivalent variations: one small tight knot orslightly open pin knot every 3’; pin worm holes; unlimited burls; scattered slight checks over less than 1 /3 ofpiece; limited amount of small open checks to 3 “ long; brown streaks should not extend the entire length ofpiece; a limited amount of dark brown streaks 1 /8 ” wide and less; and stained sapwood if a uniform light gray

color.

The face may contain the following imper-fections in machining and equivalent variations: slight edge and cornerbreakage; slightly open splice lines and joints to 2” long; torn grain which will sand out; occasional indented orcrushed fibers; slight fiber tear out around veneer plugs; an intermittent machine burn across the face; and slightsplintering or rough grain if able to brush/rub off easily.

The face may not contain the following: rot, shake, delaminations, sander dips, bit ends, and splintering. Corelaps are not allowed.

NOFMA NO. 1 COMMON ENGINEERED - OAKAn engineered flooring product which con-tains prominent variations in coloration and varying characters.

The face may contain the following speci-fied characters and equivalent variations: unlim-ited tight knots to 3 /4” diameter with 1 /16 ” wide cracks; occasional shot worm holes; angled pin worm holes extending to 1 /2 ”across the face; sound bark pockets with slight openings; unlimit-ed checks less than 1 /16 ” wide; 1 /16 ” x 2”checks, one per foot; and heavy mineral streaks, dark flag worm holes, and prominent splotchy stain where darkdiscoloration is less than 50% of piece.

The face may contain the following imper-fections in machining and equivalent variations: minor edge and cornerbreakage not extending below face veneer and with no splintering; read-ily fillable joints and lines at splices;unlimited diagonal splices; an occasional area of torn grain to 1 /16 ” deep; small indentions to 1 /16 ” deep;slight fiber tear out around veneer plugs; unlimited rough grain if not containing loose splinters; two 1 /2 ” widedark machine burns per 3’ across the face; and a slightly bit end.

The face may not contain the following: rot, shake, delaminations, sander dips, and splinters which are not easilyrubbed/brushed off. Core laps are not allowed.

NOFMA NO. 2 COMMON ENGINEERED - OAKAn engineered flooring product which may contain sound natural variations of the forest product andmanufacturing imperfections.

The face may contain the following specified characters and equivalent variations: unlimited tight knots andbroken knots with 3 /8 ” maximum opening; fillable cross-face worm holes, flag worm holes, and grub wormholes; bark pockets with maximum 3 /8 ” open or unsound area; unlimited open checks smaller than 1 /8 ” andone check per piece 1 /8 ” x 6”; unlimited dark coloration, mineral streaks, and splotchy/speckled stain; andunlimited sound rot with scattered pitting.

The face may contain the following imper-fections in machining and equivalent variations: edge and cornerbreakage to 3 /16 ” x 1” or equivalent, depth not considered; readily fillable joints and lines at splices with 1 /32 ”or smaller openings; unlimited diagonal splices; a full width area of torn grain 3” long to 1 /8 ” deep every 2‘;indentations to 1 /4 ” deep; 1 /16 ” fiber tear out around veneer plugs; unlimited rough grain if not containingloose splinters; dark machine burns not deeper than 3 /64 ”; and a bit end to 1 /16 ” deep.

The face may not contain the following: shake, delaminations, and splinters which are not easily rubbed/brushedoff. Core laps are allowed if not sanded through on the face ply.

1. NOFMA ENGINEERED FLOORING FACTORY FINISHED GRADESGRADING RULESNOFMA PRIME ENGINEERED - OAK

This is the top grade and the overall appearance shall be good. This grade includescharacteristics and variations in coloration which when properly filled, appropriatelycolored, and finished yield a flooring product with a uniform appearance requiring onlyminor remedial repair after installation.

The face may contain the following specified characters and equivalent variations: soundtight knots or filled cracked knots, average 1“ diameter; open pin worm holes and filledworm holes no greater than 1 /4 ”; sound bark pockets with a small filled opening;unlimited slightly open checks, limited open checks to 1 /64 ”, and filled checks to 1 /16 ”x 3”; sound rot which blends with finished color; unlimited mineral streaks in darkerstained finishes, brown mineral streaks in lighter stained finishes; and unlimited stain indark finishes and stain which blends with lighter finishes.

The face may contain the following imperfections in machining and equivalent variations:slight edge and corner breakage, may be unstained; slightly open splice lines and joints to2” long; rough grain sanded smooth and covered with finish; slight chatter; occasionalindented or crushed fibers; slight fiber tear out around veneer plugs, filled; and slightsplintering if able to brush/rub off easily.

The face may contain the following imperfections in finishing and equivalent variations:slight orange peel, intermittent white grain, and slight amount of rough finish.

The face may not contain the following: shake, delamination, sander dips,splintering,crushed grooves, finish/stain skips, dark or light ends, and debris within thefinish. Core laps are not allowed.

NOFMA CHARACTER ENGINEERED FLOORING - OAKAn engineered flooring product which contains prominent contrasting wood colorvariations, small open unfinished characters, along with properly filled characters andminor finish irregularities.

The face may contain the following specified characters and equivalent variations:unlimited sound knots with open cracks to 1 /8 ”; open worm holes to 1 /8 ” and filledworm holes to 3 /8 ”; bark pockets with up to 1 /32 ” x 1“ filled opening; open check andsplits to 1 /16 ” x 3”; sound rot; unlimited mineral streaks and stain; and a slight amountof shake.

The face may contain the following imperfections in machining and equivalent variations:edge breakage up to 1 /8 ” x 1“ and corner breakage to 1 /8 ” x 1 /4 ”, limited to face ply,may be unstained; slightly open splice lines; unlimited diagonal splices; rough grainsanded smooth and covered with stain; slight chatter; indented areas to 1 /16 ” deep;small amount of fiber tear out around veneer plugs; and slight splintering if able tobrush/rub off easily.

The face may contain the following imperfections in finishing and equivalent variations:slight orange peel, slight amount of white grain, speckled stain which blends with finishcolor, a small amount of minor debris, light or dark ends which show no contrast, andslight amount of rough finish where gloss is not dulled.

The face may not contain the following: delamination, sander dips, splintering, andcrushed grooves which prohibit engaging planks.

NOFMA CABIN ENGINEERED FLOORING - OAKAn engineered flooring product which contains prominent contrasting wood colorvariations, both filled and open characters, and some finish and manufacturingirregularities.

The face may contain the following specified characters and equivalent variations:unlimited sound knots with open cracks to 1 /4 ”; worm holes to 1 /4 ” and filled wormholes to 1 /2 ”; bark pockets with up to 3 /8 ” opening; open checks and splits to 1 /16 ”x 3”; unlimited sound rot with scattered pitting; unlimited mineral streaks and stain; andshake where color shows no major contrast.

The face may contain the following imperfections in machining and equivalent variations:edge breakage up to 1 /8 ” x l “and corner breakage to 1 /8 ” x 1 /4 ”, may be unstained;open splice lines to 1 /32 ”; unlimited diagonal splices; rough grain with no loosesplinters; moderate chatter; indented areas to 1 /4 ” x 1 /2 ”; 1 /16 ” fiber tear out aroundveneer plugs; and slight splintering if able to brush/rub off easily. Core laps allowed if notsanded through face ply.

The face may contain the following imperfections in finishing and equivalent variations:moderate—orange peel, top coat irregularity, finish skips, stain skips, rough finish;unlimited white grain showing no prominent contrast, unlimited speckled stain, debris to1 /4 of piece, light and/or dark ends, and wood filler along edge if pieces engage.

The face may not contain the following: delamination, sander dips, splintering, andcrushed grooves which prohibit engaging planks.

RETURN TO THE HOME PAGENOFMA: The Wood Flooring Manufacturers AssociationCopyright © 1997-2003. All Rights Reserved.E-Mail: info@