EN 975-1-2009 pdf download.Sawn timber – Appearance grading of hardwoods – Part 1 : Oak and beech.
This EN 975-1 specifies the rules determining the quality of appearance graded sawn timber. It describes various grades of temperate hardwood rough sawn timber and regularized timber for which it lays down denominations and definitions. It aLso gives rules for composition and acceptance of batches.
This standard gives minimum requirements for each grade classification. Sawn timber not included within limits given in this standard may be defined, If necessary, by contract specifications established on the basis of this standard.
This standard applies to grading of green and dried timber, Characteristics apply at the time of grading.
This standard does not apply to the strength grading of structural timber or to sawn timber for paflets.
This standard is applicable to the following products:
a) Oak sawn timber, in the following categories:
1) Un-edged boards: individual selected pieces and boules,
2) Square edged timber and strips (not exceeding 41 mm thickness):
3) Baulks (sum of thickness + width 200 mm and thickness> 80 mm).
b) Beech sawn timber, in the following categories:
1) Un-edged boards: individual selected pieces and boules;
2) Square edged timber and strips;
3) Prepared timber (dried timber).
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (Including any amendments) applies.
EN 844-1:1995, Round and sawn timber ± Terminology ± Part 1: General terms common to round timber and sawn timber
EN 844-3:1995, Round and sawn timber ± Terminology ± Part 3 General terms relating to sawn timber EN 844-4:1997, Round and sawn timber ± Terminology ± Part 4: Terms relating to moisture content
EN 844-6:1997, Round and sawn timber ± Terminology ± Part 6: Terms relating to dimensions of sawn timber
EN 844-7:1997, Round and sawn timber ± Terminology ± Part 7: Terms relating to anatomical structure of timber
EN 844-9:1997, Round and sawn timber ± Terminology ± Part 9: Terms relating to features of sawn limber
EN 844-10:1998. Round and sawn timber ± Terminology ± Part 10: Terms relating to stain and fungal attack
EN 844-11:1998. Round and sawn timber ± Terminology ± Part 11: Terms relating to degrade by insects
EN 844-12:2000, Round and sawn timber ± Terminology ± Part 12: Additional terms and general index
EN 1310, Round and sawn timber ± Method of measurement of features
EN 1311 • Round and sawn limber ± Method of measurement of biological degrade
EN 1313-2. Round and sawn timber ± Permitted deviations and preferred sizes ± Part 2: Hardwood sawn
timber
3 Terms and definitions
For the purposes of this document, the terms and definitions given in EN 844-1:1995, EN 844-3:1995.
EN 844-4:1997, EN 844-6:1997, EN 844-7:1997, EN 844-9:1997, EN 844-10:1998, EN 844-11:1998 and
EN 844-12:2000 and the following apply.
3.1
dried timber
timber with a stiDulated reduced moisture content
3.2
green timber
timber that has not been dried to or below the fibre saturation point
NOTE Green timber has a moisture cxrntent normally above 30 %.
(EN 8444:1997]
3.3
width or length reduction
notional decrease in the actual dimensions of a board to exclude features that may subsequentiy be removed
4 Method of determination of sawn timber quality
4.1 Rules for grading
Hardwood (oak and beech) can be put into grades using the principles laid down in 4.2, the criteria defined in 4.3 and the following tables:
— Table 2 gives rules for grading oak un-edged boards:
— Table 3 gives rules for grading oak strips and square edged timber;
— Table 4 gives rules for grading oak baulks;
— Table 5 gives rules for grading beech un-edged boards:
— Table 6 gives rules for grading beech strips and square edged timber; Table 7 gives rules for grading beech prepared timber.
4.2 Grading principles
4.2.1 Assessment of the quality
For individual selected boards arid boules grading is maoe on me races, ror omer pieces graaing is maoe On faces and edges. The size, position and frequency of features, sawing defects and detenorations are taken into account. Non-conformity with the conditions applicable to any one of these elements is sufficient to downgrade the piece.
Dimensional variation is not taken into account for quality grading of the pieces. II is already covered by EN 1313-2 or by any specific requirements defined contractually.
Only the following categories can be reduced In width andlor length:
— Individual selected boards.
— boules.
4.2.2 Cases of un-edged boards
4.2.2.1 IndivIdual selected boards
No more than 10% of pieces one grade lower than the lowest one stated for the batch is allowed. For mixed
grade batches the minimum proportion of each grade shall be identified.
4.2.2.2 Boules
Recognising the characteristics inherent in a growing tree, a boule may comprise a number of un-edged boards of different grades.
Proportion of grades allowed within a boule is given in Table 1:EN 975-1-2009 pdf download.
EN 975-1-2009 pdf download
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