BS EN 975-1:2009 pdf free download – Sawn timber – Appearance grading of hardwoods Part 1: Oak and beech.
BS 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 pallets.
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 844-9:1997, Round and sawn timber — Terminology — Part 9: Terms relating to features of sawn timber
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
Round and sawn timber — Terminology — Part 3: General terms relating to sawn timber
Round and sawn timber — Terminology — Part 4: Terms relating to moisture content
Round and sawn timber — Terminology — Part 6: Terms relating to dimensions of sawn timber
Round and sawn timber — Terminology — Part 7: Terms relating to anatomical structure
7.2.2 Presence of a solitary feature (only one)
Un-edged boards cannot be downgraded by the presence of only one feature which is not accepted in a grading. Consequently, this feature is accepted with a width or length reduction.
7.3 Strips and square edged timber
7.3.1 Knots
Take into account knots in the most penalized linear metre or the whole piece if the length is < 1 m. Equivalence concept, except for Q-Fla. This allows any repartition of knots, providing: — each knot diameter is under maximum allowed diameter; the sum of diameters is below the maximum permitted. Example for QF-2: the maximum allowed diameter of knot is 25 mm; — the maximum number is 3, so the sum is 75 mm (25 mm x 3). One possible repartition is 4 knots of 10 mm, 1 knot of 15 mm and 1 knot of 20 mm. 7.3.2 Other features These features are taken into account on the whole piece. 7.4 Baulks Take into account features on the whole piece, except for dead knots where the maximum number is determined by linear metre.