{"id":7025,"date":"2021-12-21T12:20:29","date_gmt":"2021-12-21T10:20:29","guid":{"rendered":"https:\/\/www.nwpc.eu\/?p=7025"},"modified":"2022-03-06T16:46:25","modified_gmt":"2022-03-06T14:46:25","slug":"natural-durability-of-wood","status":"publish","type":"post","link":"https:\/\/www.nwpc.eu\/index.php\/2021\/12\/21\/natural-durability-of-wood\/","title":{"rendered":"Natural durability of wood"},"content":{"rendered":"

[et_pb_section fb_built=”1″ _builder_version=”3.22″ global_colors_info=”{}”][et_pb_row column_structure=”1_5,3_5,1_5″ _builder_version=”3.25″ background_size=”initial” background_position=”top_left” background_repeat=”repeat” global_colors_info=”{}”][et_pb_column type=”1_5″ _builder_version=”3.25″ custom_padding=”|||” global_colors_info=”{}” custom_padding__hover=”|||”][\/et_pb_column][et_pb_column type=”3_5″ _builder_version=”4.14.4″ _module_preset=”default” global_colors_info=”{}”][et_pb_text _builder_version=”4.14.8″ _module_preset=”default” global_colors_info=”{}”]<\/p>\n

There is a European standard that defines durability of wood and how to test, classify wood and wood products according their natural durability to biological agents.<\/p>\n

The European standard EN 350 evaluates and lists the durability properties of all types of wood. The standard applies to solid wood and only heartwood 100%. Sapwood is never durable for any species. This is very important to know and it is also equal important how much or the wood is sapwood and heartwood. Some species is made up of only heartwood and some is only sapwood. This will make a huge impact on the durability of the woodproduct in use.\u00a0 \u00a0<\/p>\n

The durability is stated on a scale from 1 to 5 where 1 is very durable and 5 is non-durable. Furthermore, there is information on variability and how much of it normally consists of heartwood and sapwood, respectively.<\/p>\n

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\u00a0<\/h3>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
\n
Wood spies type<\/h5>\n<\/td>\n
\n
Durability class<\/h5>\n<\/td>\n
\n
\u00a0Type of wood<\/h5>\n<\/td>\n<\/tr>\n<\/thead>\n
Larch (origin Europe and Japan)<\/td>\n4<\/td>\nConifers<\/td>\n<\/tr>\n
Pine (European origin) (sylvestris)<\/td>\n3-4<\/td>\nConifers<\/td>\n<\/tr>\n
Douglas fir (native to North America)<\/td>\n3<\/td>\nConifers<\/td>\n<\/tr>\n
Douglas fir (grown in Europe)<\/td>\n3-4<\/td>\nConifers<\/td>\n<\/tr>\n
Yew (origin Europe)<\/td>\n2<\/td>\nBroadleaf<\/td>\n<\/tr>\n
Birch (origin Europe)<\/td>\n5<\/td>\nBroadleaf<\/td>\n<\/tr>\n
Ash (origin Europe)<\/td>\n5<\/td>\nBroadleaf<\/td>\n<\/tr>\n
Oak (origin Europe)<\/td>\n2-4<\/td>\nBroadleaf<\/td>\n<\/tr>\n
Teak (origin Asia)<\/td>\n1<\/td>\nBroadleaf<\/td>\n<\/tr>\n
Teak (grown Asia etc.)<\/td>\n1-3<\/td>\nBroadleaf<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

 <\/p>\n

[\/et_pb_text][et_pb_text _builder_version=”4.14.4″ _module_preset=”default” global_colors_info=”{}”]<\/p>\n

When intervals are stated, such as on Pine and on Oak, it means that there are large deviations depending on, for example, plant location etc.<\/em><\/p>\n

The standard is available for purchase from where standards is published and sold.<\/p>\n

[\/et_pb_text][\/et_pb_column][\/et_pb_row][\/et_pb_section]<\/p>\n","protected":false},"excerpt":{"rendered":"

There is a European standard that defines durability of wood and how to test, classify wood and wood products according their natural durability to biological agents. The European standard EN 350 evaluates and lists the durability properties of all types of wood. The standard applies to solid wood and only heartwood 100%. Sapwood is never […]<\/p>\n","protected":false},"author":2,"featured_media":2273,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_et_pb_use_builder":"on","_et_pb_old_content":"

There is a European standard that test, classify and lists wood and wood products according their natural durability to biological agents.<\/h5>

The European standard EN 350 evaluates and lists the durability properties of all types of wood. The standard applies to solid wood and only heartwood 100%. Sapwood is never durable for any species. The durability is stated on a scale from 1 to 5 where 1 is very durable and 5 is non-durable. Furthermore, there is information on variability and how much of it normally consists of heartwood and sapwood, respectively.<\/p>

Durability classes (DC)
DC 1 VERY DURABLE<\/p>

DC 2 DURABLE<\/p>

DC 3 MODERATELY DURABLE<\/p>

DC 4 SLIGHTLY DURABLE<\/p>

DC 5 NOT DURABLE<\/p>

Sapwood of all wood is considered to belong to durability class 5 (not durable). Most soft wood species have a large proportion of sapwood and is in pratice regarded as not durable.<\/p>

Natural durability of heartwood<\/p>

Wood spies type Durability class Type of wood
Larch (origin Europe and Japan 3-4 Conifers
Spruce (origin Europe) 4 Conifers
Pine (European origin) 3-4 Conifers
Douglas fir (native to North America) 3 Conifers
Douglas fir (grown in Europe) 3-4 Conifers
Idegran (origin Europe) 2 Conifers
Al (origin Europe) 5 Deciduous trees
Birch (origin Europe) 5 Deciduous trees
Ash (origin Europe) 5 Deciduous trees
Oak (origin Europe) 2-4 Deciduous trees
Teak (origin Asia) 1 Deciduous tree
Teak (grown Asia etc.) 1-3 Deciduous trees
Edit table
When intervals are stated, such as on Ek, it means that there are large deviations depending on, for example, plant location etc.<\/p>

The standard is available for purchase from SIS.<\/p>","_et_gb_content_width":"","ngg_post_thumbnail":0,"footnotes":""},"categories":[3],"tags":[],"class_list":["post-7025","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-uncategorized"],"_links":{"self":[{"href":"https:\/\/www.nwpc.eu\/index.php\/wp-json\/wp\/v2\/posts\/7025","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.nwpc.eu\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.nwpc.eu\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.nwpc.eu\/index.php\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.nwpc.eu\/index.php\/wp-json\/wp\/v2\/comments?post=7025"}],"version-history":[{"count":10,"href":"https:\/\/www.nwpc.eu\/index.php\/wp-json\/wp\/v2\/posts\/7025\/revisions"}],"predecessor-version":[{"id":8423,"href":"https:\/\/www.nwpc.eu\/index.php\/wp-json\/wp\/v2\/posts\/7025\/revisions\/8423"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.nwpc.eu\/index.php\/wp-json\/wp\/v2\/media\/2273"}],"wp:attachment":[{"href":"https:\/\/www.nwpc.eu\/index.php\/wp-json\/wp\/v2\/media?parent=7025"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.nwpc.eu\/index.php\/wp-json\/wp\/v2\/categories?post=7025"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.nwpc.eu\/index.php\/wp-json\/wp\/v2\/tags?post=7025"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}