{"id":455,"date":"2016-01-12T14:06:04","date_gmt":"2016-01-12T14:06:04","guid":{"rendered":"http:\/\/blogs.napier.ac.uk\/cwst\/?p=455"},"modified":"2016-01-13T16:26:15","modified_gmt":"2016-01-13T16:26:15","slug":"voting-on-en14081","status":"publish","type":"post","link":"https:\/\/blogs.napier.ac.uk\/cwst\/voting-on-en14081\/","title":{"rendered":"Voting on the revised EN14081-1"},"content":{"rendered":"

The European Standard EN14081-1 “Timber structures – Strength graded structural timber with\u00a0rectangular cross section – Part 1 General requirements”\u00a0<\/em>is entering the final stages of revision, having been updated to the Construction Products Regulations<\/a>\u00a0(CPR) (EU Regulation n\u00b0305\/2011\u00a0amended by\u00a0delegated regulation n\u00b0574\/2014). \u00a0It is almost certain to pass the vote (being made today), having only previously been blocked on the issue of what can be used to mark the timber dry-graded.<\/p>\n

Previously the revision had tried to simplify trade\u00a0by specifying that only the symbol, DG, could be used to denote dry-graded timber, but now it will be permitted to use another symbol\u00a0(e.g. KD)\u00a0provided that this means that the timber meets the requirements of what dry-graded means,\u00a0as specified in the Standard, and is clearly stated as such in the documentation accompanying the timber.<\/p>\n

This sounds like a statement of the obvious, but it is related to the shift in what is to be correctly understood by the words dry-graded. \u00a0It is not simply the same as saying it is kiln dried. \u00a0Dry-graded timber is timber that has been checked for fissures and distortion (bow, spring and twist) in the dry condition (although this could be as high as 20% moisture content). \u00a0What dry-graded timber does not indicate is moisture condition of the timber when it is received, and this needs to be specified separately in the contractual arrangement. \u00a0It also does not relate (directly) to use classes in EN1995. \u00a0If timber is not dry-graded, but is dry when used in the building, then it will need first to be checked for fissures and distortion.<\/p>\n

Perhaps the biggest change for users\u00a0is that it will become possible for visually graded timber to be placed on the market with no mark on the timber, as the Standard gives two options:<\/p>\n

a) Method A – Individual piece marking:\u00a0Each piece of graded structural timber shall be clearly and indelibly marked (with what is commonly called the grade stamp in the UK)
\nb) Method B – package marking:\u00a0Each package of graded structural timber shall be clearly and indelibly marked with a label attached to\u00a0the package<\/p>\n

(All machine graded timber will still need to be piece marked)
\nThe UK’s mirror committee (BSI B\/518) disagrees with\u00a0package marking. Although the CPR places obligation to ensure\u00a0that any consignment of strength-graded structural timber is accompanied by the required documentation, there is still a greater possibility of timber being misidentified when it is not\u00a0individually grade stamped. \u00a0For this reason the UK National Annex to EN 1995-1-1 applies an increased partial safety factor for timber which is package marked (a\u00a0factor that significantly reduces the design strength of the timber). \u00a0The only case in which it would not be required to apply this increased partial safety factor is when the\u00a0visually strength-graded structural timber is requested to be supplied without grade stamps solely for aesthetic reasons, and\u00a0only then where it is requested by a single customer in respect of a single project.<\/p>\n

A mark of PT on the timber will be required, in some countries, when the timber is preservative treated. \u00a0We managed to avoid this being a blanket requirement throughout Europe because it is not required in the UK, and it would be a problem for producers to mark the timber after it has been packaged for the treatment.<\/p>\n

The revision has also involved some changes to Mandate M\/112\u00a0“Structural timber products and\u00a0<\/em>ancillaries”<\/em><\/a><\/p>\n

Update 13\/1\/2016: the voting passed. \u00a0There are 10 pages of comments (of which we submitted 4). Editorial comments will now be considered by CEN TC124 WG2 after which the revised standard will be ratified and (assuming that the European Commission gives the go ahead) published.<\/p>\n","protected":false},"excerpt":{"rendered":"

The European Standard EN14081-1 “Timber structures – Strength graded structural timber with\u00a0rectangular cross section – Part 1 General requirements”\u00a0is entering the final stages of revision, […]<\/a><\/p>\n<\/div>","protected":false},"author":57,"featured_media":461,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_crdt_document":"","jetpack_post_was_ever_published":false,"footnotes":""},"categories":[5],"tags":[9,20,27,56],"class_list":["post-455","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-standards","tag-en14081","tag-strength-grading","tag-timber-engineering","tag-timber-grading"],"yoast_head":"\nVoting on the revised EN14081-1 - Centre for Wood Science & Technology<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/blogs.napier.ac.uk\/cwst\/voting-on-en14081\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Voting on the revised EN14081-1 - 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