{"id":219076,"date":"2024-10-19T14:12:54","date_gmt":"2024-10-19T14:12:54","guid":{"rendered":"https:\/\/pdfstandards.shop\/product\/uncategorized\/bs-49782007a22017\/"},"modified":"2024-10-25T07:30:46","modified_gmt":"2024-10-25T07:30:46","slug":"bs-49782007a22017","status":"publish","type":"product","link":"https:\/\/pdfstandards.shop\/product\/publishers\/bsi\/bs-49782007a22017\/","title":{"rendered":"BS 4978:2007+A2:2017"},"content":{"rendered":"<p>This British Standard specifies a methodology for the visual strength grading of softwood for structural use.<\/p>\n<p>The permissible limits of characteristics are specified for two visual strength grades of softwood:<\/p>\n<ul>\n<li>\n<p>GS \u2012 General Structural; and<\/p>\n<\/li>\n<li>\n<p>SS \u2012 Special Structural.<\/p>\n<\/li>\n<\/ul>\n<p><i>Text deleted<\/i><\/p>\n<h4>PDF Catalog<\/h4>\n<table border=\"1px\" class=\"des-table\">\n<tr>\n<th>PDF Pages<\/th>\n<th>PDF Title<\/th>\n<\/tr>\n<tr>\n<td><b>4<b><\/td>\n<td>Foreword  <\/td>\n<\/tr>\n<tr>\n<td><b>5<b><\/td>\n<td>1 Scope <br \/> 2 Normative references <br \/> 3 Terms and definitions  <\/td>\n<\/tr>\n<tr>\n<td><b>6<b><\/td>\n<td>4 Strength graded timber  <\/td>\n<\/tr>\n<tr>\n<td><b>7<b><\/td>\n<td>Figure 1 \u2014 Edge, face and margin areas  <\/td>\n<\/tr>\n<tr>\n<td><b>8<b><\/td>\n<td>5 Grade requirements <br \/> 6 Measurement of characteristics  <\/td>\n<\/tr>\n<tr>\n<td><b>9<b><\/td>\n<td>Figure 2 \u2014 Knot projection  <\/td>\n<\/tr>\n<tr>\n<td><b>11<b><\/td>\n<td>Figure 3 \u2014 Typical knot area ratios and the resulting grades  <\/td>\n<\/tr>\n<tr>\n<td><b>12<b><\/td>\n<td>Figure 4 \u2014 Measurement of rate of growth  <\/td>\n<\/tr>\n<tr>\n<td><b>13<b><\/td>\n<td>Figure 5 \u2014 Amounts of wane <br \/> Figure 6 \u2014 Measurement of bow, spring and twist  <\/td>\n<\/tr>\n<tr>\n<td><b>14<b><\/td>\n<td>Table 1 Permissible limits for the GS and SS visual strength grades  <\/td>\n<\/tr>\n<tr>\n<td><b>15<b><\/td>\n<td>7 Marking\ufffd) <br \/> Figure 7 Example of a mark on visually strength graded softwood  <\/td>\n<\/tr>\n<tr>\n<td><b>16<b><\/td>\n<td>Annex A (normative)\u2002 Determination of the knot area ratio in cases of dispute <br \/> Annex B (normative)\u2002 The control and supervision of visual strength grading operations  <\/td>\n<\/tr>\n<tr>\n<td><b>18<b><\/td>\n<td>Bibliography  <\/td>\n<\/tr>\n<\/table>\n","protected":false},"excerpt":{"rendered":"<p><b>Visual strength grading of softwood. Specification<\/b><\/p>\n<table class=\"shortdes-table\" style=\"width: 100%\" border=\"0\" cellspacing=\"0\" cellpadding=\"0\">\n<tbody>\n<tr>\n<td>Published By<\/td>\n<td>Publication Date<\/td>\n<td>Number of Pages<\/td>\n<\/tr>\n<tr>\n<td><a href=\"https:\/\/pdfstandards.shop\/product-category\/publishers\/bsi\/\"><b>BSI<\/b><\/a><\/td>\n<td>2017<\/td>\n<td>20<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n","protected":false},"featured_media":219080,"template":"","meta":{"rank_math_lock_modified_date":false,"ep_exclude_from_search":false},"product_cat":[2641],"product_tag":[],"class_list":{"0":"post-219076","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_cat-bsi","8":"first","9":"instock","10":"sold-individually","11":"shipping-taxable","12":"purchasable","13":"product-type-simple"},"_links":{"self":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product\/219076","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/types\/product"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/media\/219080"}],"wp:attachment":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/media?parent=219076"}],"wp:term":[{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_cat?post=219076"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_tag?post=219076"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}