{"id":614,"date":"2016-04-02T14:21:46","date_gmt":"2016-04-02T14:21:46","guid":{"rendered":"http:\/\/blogs.napier.ac.uk\/cwst\/?p=614"},"modified":"2016-04-02T14:21:46","modified_gmt":"2016-04-02T14:21:46","slug":"whats-new-about-grade-stamps","status":"publish","type":"post","link":"https:\/\/blogs.napier.ac.uk\/cwst\/whats-new-about-grade-stamps\/","title":{"rendered":"What&#8217;s new about grade stamps?"},"content":{"rendered":"<p>The UK has a long history of marking graded timber with a stamp &#8211; so that there is no risk of graded timber being misidentified and enabling the installed timber\u00a0to be inspected to check the correct grade has been used. \u00a0This is customarily known as a &#8220;grade stamp&#8221; but in the language of the European Standards\u00a0it is a &#8220;marking&#8221;. \u00a0It is not the same as the CE marking (see below).<\/p>\n<p>Clause 7 of EN14081-1:2016 allows marking by two methods:<\/p>\n<p>a) Method A &#8211; Individual piece marking:<br \/>\nEach piece of graded structural timber shall be clearly and indelibly marked<\/p>\n<p>b) Method B &#8211; package marking:<br \/>\nEach package of graded structural timber shall be clearly and indelibly marked with a label attached to\u00a0the package<\/p>\n<p>Machine graded timber has to be piece marked (method A) but visual graded timber may be piece marked, or packaged marked (either method A or B).<\/p>\n<p>In either case, the mark must contain the following:<\/p>\n<ul>\n<li>Manufacturer name\/logo<\/li>\n<li>Declaration of Performance (DoP) reference\/number (an identification code)<\/li>\n<li>Strength Class (or equivalent information about its performance)<\/li>\n<li>\u201cDG\u201d (or alternative marking meaning the same) when the timber has been Dry-Graded<\/li>\n<li>\u201cM\u201d when the timber has been Machine Graded<\/li>\n<li>CE \u2018symbol\u2019<\/li>\n<\/ul>\n<p>Extra\u00a0information may also be provided on the grade stamp, so long as it does not conflict with the required information. \u00a0Examples of other information that may be provided in the stamp are:<\/p>\n<ul>\n<li>the number or logo of the Notified Body<\/li>\n<li>the visual grade of the timber and the grading rule\/standard<\/li>\n<li>the wood species or species combination by code or botanical name<\/li>\n<\/ul>\n<p>Some countries require preservative treated timber to be marked with the symbol\u00a0\u201cPT\u201d (regardless of it being marked by method A or B) so that this is traceable for reuse and recycling. This is not a requirement in the UK (it is not considered practical as the timber is commonly treated after\u00a0being stacked).<\/p>\n<p>The option of method B was included to satisfy smaller producers in some countries that did not want the expense of stamping the timber. \u00a0Initially this was proposed to be limited to cases where there was little risk of the timber being misidentified &#8211; going straight from the grader to a specific customer and specific construction &#8211; but it later got widened to a general option &#8230;the reasoning being that the CPR requires that the information about the timber to remain linked to the timber (somehow). \u00a0BSI B\/518 (the\u00a0UK mirror committee of CEN\/TC124\/WG2) disagrees with such wide application of\u00a0option of method B, and will provide some additional information,\u00a0confirming the UK position with regard to \u2018package marking\u2019 in a National Annex to BSEN14081-1.<\/p>\n<p><strong>The partial factor in <a href=\"http:\/\/shop.bsigroup.com\/\" target=\"_blank\">NA TO BS EN 1995-1-1:2004+A1:2008+A2:2012<\/a><\/strong><\/p>\n<p>the UK National Annex to BSEN1995-1-1 applies a specific partial factor to \u2018solid timber grade stamp package marked\u2019 for strength graded timber supplied in accordance with the \u2018package marking\u2019 option (method B). This partial factor significantly\u00a0reduces the design strength of the timber and it is required because, notwithstanding the traceability requirement\u00a0of the CPR, there is a risk of incorrect identification of unmarked timber.<\/p>\n<p>More specifically, the UK NA to\u00a0BSEN14081-1 will ask that the grade stamp must be stamped clearly and indelibly at least once on a face or edge and at least 600mm from the end of the piece. Grade stamped timber not meeting this requirement is to be regarded as being package marked (ie subject to the specific partial factor), owing to the possibility of the grade stamp being removed or hidden early during construction. \u00a0(These conditions continue previous UK requirements on the grade stamp).<\/p>\n<p>The only exception to the application of the partial factor for package marked timber is to be when the grade stamp is omitted for aesthetic reasons, and there is no significant risk of misidentification of the timber. \u00a0Specifically, where visually strength-graded structural timber is requested to be supplied without grade stamps, for aesthetic reasons, then the timber may be marked according to method b (package marking). This is permitted only where a customer requests it for a single structure &#8211; and\u00a0the timbers are exposed on completion (justifying the package marking on aesthetic grounds).<\/p>\n<p><strong>The CE marking and declaration of performance<\/strong><\/p>\n<p>EN14081-1:2016 defers to the CPR more than previous versions &#8211; since it is the CPR that\u00a0lays down the requirements on CE marking and declaration of performance (governed by what is written in the <a href=\"http:\/\/ec.europa.eu\/growth\/tools-databases\/mandates\/index.cfm?fuseaction=search.main\" target=\"_blank\">Mandate &#8211; in this case M\/112<\/a>),\u00a0and it is not the place of the EN to interpret them. \u00a0The <a href=\"http:\/\/ec.europa.eu\/growth\/sectors\/construction\/product-regulation\/index_en.htm\" target=\"_blank\">CPR, including its amendments, and delegated acts, is not an easy read<\/a>. \u00a0Indeed it is rather confusing in places. \u00a0For example, the &#8220;CE marking&#8221;, strictly, refers to the CE symbol &#8211; which is why it asks for the CE marking to be followed by the information that we would regard, in normal language, as being part of the CE mark.<\/p>\n<p>The CPR requires that the CE marking accompany every delivery to every customer. \u00a0While the grade stamp includes the CE symbol, the required information falls short of that required for the CE marking. Ideally, the CE marking would be in the timber &#8211; but it is rather a long list. \u00a0So,\u00a0in addition to grade stamp, the CE marking must be affixed to the accompanying commercial documents (or the packaging of the timber), and this must go with\u00a0the timber to its final recipient. \u00a0(Note that the concept of partial and complete CE marking did not survive the editing of the standard &#8211; this is only one CE marking)<\/p>\n<p><strong>Important:<\/strong> This informal information\u00a0is not a substitute for reading <a href=\"http:\/\/shop.bsigroup.com\/\" target=\"_blank\">EN14081-1<\/a> and the <a href=\"http:\/\/ec.europa.eu\/growth\/sectors\/construction\/product-regulation\/index_en.htm\" target=\"_blank\">Construction Products Regulation<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<div class=\"mh-excerpt\"><p>The UK has a long history of marking graded timber with a stamp &#8211; so that there is no risk of graded timber being misidentified <a class=\"mh-excerpt-more\" href=\"https:\/\/blogs.napier.ac.uk\/cwst\/whats-new-about-grade-stamps\/\" title=\"What&#8217;s new about grade stamps?\">[&#8230;]<\/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":[96,95,97,9,94,20,27,56],"class_list":["post-614","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-standards","tag-ce-marking","tag-cpr","tag-dop","tag-en14081","tag-en1995","tag-strength-grading","tag-timber-engineering","tag-timber-grading"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>What&#039;s new about grade stamps? 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