{"id":1404,"date":"2017-11-13T10:30:23","date_gmt":"2017-11-13T10:30:23","guid":{"rendered":"http:\/\/blogs.napier.ac.uk\/cwst\/?p=1404"},"modified":"2017-11-13T10:31:31","modified_gmt":"2017-11-13T10:31:31","slug":"iso-timber-grading","status":"publish","type":"post","link":"https:\/\/blogs.napier.ac.uk\/cwst\/iso-timber-grading\/","title":{"rendered":"ISO standards for timber grading"},"content":{"rendered":"

It’s worth keeping an eye on what is happening with ISO (International Organization for Standardization<\/a>) standards for timber grading.\u00a0 This is covered by\u00a0ISO TC 165<\/a>\u00a0“timber structures”.\u00a0 There are\u00a0several interesting standards<\/a> under this technical committee, but it’s the ones under working group WG11 “classification of solid timber” that we will briefly consider in this blog post – specifically these two:<\/p>\n

ISO 13912<\/a>\u00a0Structural timber – Machine strength grading – Basic principles<\/p>\n

ISO 9709<\/a>\u00a0Structural timber – Visual strength grading – Basic principles<\/p>\n

Both of these refer to\u00a0ISO 16598:2015<\/a>, which provides a basic international framework<\/a> for establishing structural classes for sawn timber<\/p>\n

A revision of ISO 13912 was, not long ago, voted through and so should be soon published, replacing the previous version: ISO 13912:2005.<\/p>\n

The current version of ISO 9709 is the 2005 version (confirmed in 2009), but an Enquiry stage draft (ISO\/DIS) was very recently voted through.\u00a0 The draft standard will undergo some further revision, following comments, and submitted to a second DIS vote by February 2018.\u00a0 A new annex will be added showing an example for tropical hardwoods.<\/p>\n

ISO 16598 has a lot in it that we could comment on – but we will reserve for a future blog post.\u00a0 For now we will observe that it provides a couple of definitions that are not well covered in the current European Standards for timber grading – but are terms we use a lot in our work:<\/p>\n

full-size specimen:\u00a0a timber test piece that is similar in size and characteristics to typical structural timbers and is\u00a0prepared and tested in a way similar to use in construction.
\n(we often also call this a “structural size specimen”)<\/p>\n

small clear specimen:\u00a0a timber test piece that is much smaller than typical structural timbers and normally prepared to be\u00a0free of visible defects.<\/p>\n

As with the European system, the ISO requires that all major property data are based on full-size testing of timber.\u00a0 Exceptions are allowed when\u00a0consideration of small clear wood test data is necessary for cost or practical reasons and<\/em> supported by data that shows the relationship to full-size structural performance (sometimes the case for tropical hardwoods).\u00a0 The ISO remarks that data for small and full-size testing should be kept separate – something that is sometimes not properly observed in publications!<\/p>\n

 <\/p>\n","protected":false},"excerpt":{"rendered":"

It’s worth keeping an eye on what is happening with ISO (International Organization for Standardization) standards for timber grading.\u00a0 This is covered by\u00a0ISO TC 165\u00a0“timber […]<\/a><\/p>\n<\/div>","protected":false},"author":57,"featured_media":111,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_crdt_document":"","jetpack_post_was_ever_published":false,"footnotes":""},"categories":[5],"tags":[135,19,20,56,67],"class_list":["post-1404","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-standards","tag-iso","tag-machine-grading","tag-strength-grading","tag-timber-grading","tag-visual-grading"],"yoast_head":"\nISO standards for timber grading - 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\/iso-timber-grading\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"ISO standards for timber grading - 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