Better Home
»
PROPERTIES
»
HOME MAINTENANCE
»
Floor
»
Durability is not determined by the density or ‘hardness’
Rank: Administration
Groups: AcademicCoachingSchool, admin, Administration, BookSeller, CatholicSchool, CoachingAdult, CoachingProfessional, CoachingSports, ExtraCurriculumCoaching, IndependentSchool, Moderator, MusicTeacher, PrivateSchool, PublicSchool, SelectiveSchool, tutor Joined: 16/10/2009(UTC) Posts: 47
|
Durability is not determined by the density or ‘hardness’ Some timber species are more effective at resisting fungi and termites than other species. This natural resistance or durability depends on the extractives the tree stores in its heartwood. Please note that durability is not determined by the density or ‘hardness’ of the species. Durability ClassesClass 1 – highly durableGrey Ironbark Tallowwood Cypress Turpentine Forest red gum Grey gum Class 2 – durableSpotted gum Blackbutt Western red cedar River red gum Jarrah Sydney blue gum Stringy bark (yellow and white) Class 3 – moderately durableBrush box Rose/flooded gum Keruing Messmate Karri Silver topped stringy bark Class 4 – non-durableNon- durable Douglas fir Hoop pine Slash pine Radiata pine Mountain ash / Tasmanian oak Meranti Unidentified timbers Sapwood of any species The durability class only applies to the heartwood of the species. All untreated sapwood is considered non-durable. Core wood (wood from the very center of the tree) generally also has marginally lower natural durability than the rest of the heartwood as it was laid down when the tree was immature and production of the full range of extractives was not fully developed. Measured by “graveyard tests†by examining the progressive decay of small wooden stakes buried in the ground, i.e. in-ground situation in an adverse environment - High moisture content, high temperatures and presence of termites. We neglected maintenance for the relative natural durability. Please note that it is possible for even a Class 1 timber to degrade in service within 25 years if it is intermittently in contact with water. However, it fully protected, all durability classes can be more than 50 years. Heartwood service life in years if exposed above ground: class 1, 50+ class 1, 30 class 1, 15 class 1, 5 – 8
|
|
|
|
Better Home
»
PROPERTIES
»
HOME MAINTENANCE
»
Floor
»
Durability is not determined by the density or ‘hardness’
Forum Jump
You cannot post new topics in this forum.
You cannot reply to topics in this forum.
You cannot delete your posts in this forum.
You cannot edit your posts in this forum.
You cannot create polls in this forum.
You cannot vote in polls in this forum.