AS 3818.6:2010 – Timber—Heavy structural products—Visually graded Part 6: Decking for wharves and bridges.
Timber for decking for wharves and bridges shall comply with the requirements of Section 1, Section 2, this Section, and AS 3818.1.
The methods of measurement of characteristics, grade limitations and grading, assessment of combinations of characteristics and preservative treatment shall be as specified in
AS 3818.1.
Decking supplied to this grade (Grade 2) shall be well sawn and free of heart, pipe, shakes, cross-fractures, splits other than end splits, brashness, decay and other characteristics liable to affect the utility of the decking.
Where present in graded pieces, singly or in combinations, the following characteristics shall be within the limits prescribed, except where the characteristics occur entirely within the limits for want and wane (see AS 3818.1):
(a) Sound intergroli.’n knots, individually and in aggregate in any 1.5 in of board length—
(i) not exceeding one-quarter of the width of the face on which they occur: and
(ii) not exceeding one-quarter of the thickness of the edge on which they occur.
(b) holes—
(I) diameter not exceeding 3 mm—unlimited: and
(ii) diameter exceeding 3 mum and 110! exceeding 6 mm—not more than 5 in any 0.5 m of board length.
(c) Termite galleries—
(I) where they are enclosed—not permitted: and
(ii) where 110! enclosed (fully open to inspection)—
(A) depth—not exceeding the lesser of one-tenth of the thickness of the piece and 1 2 mm; and
(B) length—not exceeding one-quarter of the length of the piece.
(d) Slope ofgrain—not exceeding I in 15.
(e) Tight gum veins—un limited
(0 Loose guimi veins—
(I) on the top frice—not permitted;
(ii) width (measured radiallv,.—not exceeding 3 mm;
(iii) aggregate length—not exceeding one-tenth of the length of the piece: and
(iv) extending from one surfrice of the piece to another—not permitted.
(g) Gum pockets, latex pockets, resin pockets, and overgrowths of injury—
(i) Of tile top face—not permitted:
(ii) extending from one sui:ftice to another amid intersecting all end—as for end splits (see
(B) width (measured radially)—
(1) occurring on one surface on/v—individually not exceeding the lesser of one-quarter of the width of the surface on which it occurs and 12 mm; and
(2) extending from one surftice to another and not intersecting an end—individually not exceeding the lesser of one-eighth of the width of the surface on which it occurs and 6 mm.
(h) End splits; aggregate length at each end—not exceeding the lesser of the width of the piece and 100 mm.
(1) Checks other than internal, width—not exceeding 1 .5 mm.
(j) Wa,it, wane and untreated sapwoocl, separately or in combination—
(1) on the top face—not permitted:
(ii) on the bottom ftice—aggregate width (at any cross-section) not exceeding 25 mm; and
(iii) on the edge—width not exceeding 12 mm.
1 Properly treated sapwood is not considered to be a limiting characteristic (see
AS 3818.1).
2 Where the top face of the deck is to be covered with sacrificial surfacing, running planks or longitudinal sheeting AND there is agreement between the purchaser and supplier, the want, wane and untreated sapwood top face may be graded as for the bottom face.