1 / 16

Durability - Hazards

Durability - Hazards. Biological/ Physical Hazards. TIMBER. Species Natural durability of heartwood. Weathering Fire Chemical. Design Detailing minimises exposure to hazards. Treatment enhances durability of sapwood. Fungi Termites / borers Marine. Maintenance ensures

ania
Download Presentation

Durability - Hazards

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Durability - Hazards Biological/ Physical Hazards TIMBER Species Natural durability of heartwood Weathering Fire Chemical Design Detailing minimises exposure to hazards Treatment enhances durability of sapwood Fungi Termites / borers Marine Maintenance ensures protection remains functional

  2. Hazards • Anything that may cause deterioration of timber during service • Reduce long-term performance • Can counter the effects of hazards by • Selection of appropriate species (Natural Durability) • Treatment • Detailing to minimize exposure to hazards • Includes weathering, chemicals, fire • No classification for these hazards – use appropriate detailing to minimize hazard impact • Includes fungal, insect, marine organism attack • Can classify according to Hazard Class scale

  3. Physical Hazards • Weathering-degradation due to weather • rain • sunlight • Chemicals -timber performs well relative to steel/concrete • resistant to degradation for pH>2 and pH<10 • softwoods marginally better than hardwoods • Fire -burning • strength during fire • insulation of walls • prevention of spread

  4. Preventable problems Photo: Geoff Boughton Marmion, WA Photo: Geoff Boughton Weathering Kangaroo Point, Qld Photo: Geoff Boughton Plamerston, NT Photo: Geoff Boughton

  5. Biological Hazards • Fungi • Termite/borers • Marine organisms Can classify according to Hazard Class scale

  6. Preventable problems Photo: Geoff Boughton Fungi damage Photo: Geoff Boughton Photo: Geoff Boughton Termite damage Marine borer damage Horticultural Training Centre, Mornington, Tas Photo: Greg Nolan

  7. Hazard Class

  8. Natural Durability (Heartwood) Extractives and growth characteristics affect natural durability of timber species

  9. Long-term Performance of Timber Can match natural durability class with environmental hazard to estimate long-term performance of untreated timber heartwood

  10. Hazard links to Treatment level Treatment levels have classes with same names as the Hazard levels • H1 – lowest level treatment – suitable for H1 hazard environments – indoors, protected • H2 – treated timber suitable for H2 hazard environments –suitable for all internal use • H3 – treated timber suitable for H3 hazard environments –suitable for above ground external use • H4 – treated timber suitable for H4 hazard environments –suitable for use in contact with dry ground • H5 – treated timber suitable for H5 hazard environments –suitable for all in-ground use

  11. H1 indoors, protected, ventilated Aged Care residence, Tapping, WA Photo: Geoff Boughton Wall panels Holybank Forest Centre Lilydale, Tas Photo: Greg Nolan

  12. H2 all internal use, poorly ventilated eg. concealed wall frames and floor timbers

  13. H3 above ground external use Queenscliffe Jetty, Vic. Photo: Greg Nolan Marina residence, SA Photo: Greg Nolan

  14. H4 in contact with dry ground Hardwood walkway, Margaret River, WA Photo: Geoff Boughton Play equipment, Geelong, Vic Photo: Geoff Boughton

  15. H5 all in-ground use, critical, subject to wetting Nanga Camp, Dwellingup, WA Photo: Geoff Boughton Logging bridge, Pemberton, WA Photo: Geoff Boughton pole house, Townsville, Qld Photo: Geoff Boughton

  16. H6 Marine use – prolonged immersion in sea water Bussleton Jetty, WA Photo: Geoff Boughton Bussleton Jetty, WA Photo: Geoff Boughton

More Related