timber queensland and events... · decking • allow for movement – shrinkage/expansion • wider...
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CLADDING, DECKING AND FLOORING
- Getting the best from local resources -
Colin MacKenzie Timber Queensland
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Cairns boardwalk
“Treetops” at Taragindi
Unit at Kangaroo Point
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Content • Key properties • Information sources • Some species attributes vs application • Some points to consider Cladding Decking Flooring
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Some key properties Property Cladding Decking Flooring
Strength - + +
Density (Hardness)
- + +
Durability + + -
Stability + + +
- Moisture content, Shrinkage and UTM
Termite resistance
+
+
+
Bushfire resistance
+ + -
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Timbers and their properties
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No Excuses!
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Book 1 – Target Design Life
Building member Environment Target design
life (yrs) Application (Column no. in
Schedules A, B and C)
architraves protected 15 12
balusters exposed 50 16
protected 50 15
barge boards exposed 15 13
battens
between stumps 5 11
under lining or cladding 50 15
external wall 15 13
greenhouse 15 13
pergola 15 13
roof, ceiling 50 15
beams exposed 50 16
protected 50 15
bearers exposed 50 16
protected 50 15
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Brisbane - June 2009
CTIQ – Book 1 – Hazard Zones
Above Ground In-Ground
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CTIQ - Layout – Book 2
Properties
Application
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Properties of various timbers Property HWD (spotted
gum, ironbark ) HWD (Other) Cypress Softwood
(Hoop, Slash etc)
Strength S2 S2 to S5 S5 S5/S6
Density (Hardness)
900 kg/m3 + High
600 kg/m3 + 700 kg/m3 500 to 650 kg/m3
Natural Durability
AG Class 1 AG Class 1 to Class 4
AG Class 1 AG Class 4
Stability (shrinkage, UTM)
6.2% 0.38
Low to V High
2.5% 0.26
4.0 to 5.0% 0.23 to 0.3
Termite resistant
Yes Some (eg BBT/Kwila)
Yes No/yes
Bushfire resistant
Yes Some (eg BBT/Kwila)
No No
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Also need to consider: • Resistance to weathering (horizontal vs
vertical) - Dense hwd’s generally good, swd not as good
• Stability – MC, straight grained • Shrinkage – swd < hwd • Fixings – hwd vs swd, splitting/pre-drilling,
corrosion resistance
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Raised grain, earlywood/latewood bands Dense hwd
weathers well but more challenging to restrain
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Correct fixings critical
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Points to consider Cladding • Allow for movement - rebates, overlaps • Dark paint = more shrinkage/checks • Colour match undercoat • Wider = greater shrinkage/expansion • Use vapour permeable sarking • Appropriate & galvanised nails etc • Knot sealer may be required
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Cladding
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Allow for movement
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Use the correct nails
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Knot sealer may be required
(Cypress, hoop, radiata etc)
e.g. two pack polyurethane
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For ‘natural’ finish, apply WRP’s
e.g. Zinc Napthenate
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Points to consider Decking • Allow for movement – shrinkage/expansion • Wider = more shrinkage/expansion/cupping • Galvanised/stainless nails or screws • Close to ground/slab high moisture under Narrow boards Wider gaps Ventilation under Rapid draining
• Minimise unsightly stains (iron, pollen etc) • Maintenance critical for performance
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Allow for expansion and shrinkage
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Decks close to/on ground/slab
Increase gaps, provide edge ventilation, rapid drainage and use narrow boards
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Correct moisture content can be critical
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Minimise splitting
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Joist strips
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Stains caused by pollutants
e.g. pollen, iron
filings, jet fuel fallout etc
Apply a finish all round before laying
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Reeded side up or reeded side down?
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Maintain for maximum life
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Commercial decking
• Usually unseasoned • Allow for shrinkage • Surface finish and grade • B:D ratio 4:1 max • Fixings and corrosion resistance • Finish and maintenance
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Commercial decking
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Dancing with the stars
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Flooring
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I Google’d images, “timber flooring” and this is what appeared
So, I’d like to reinforce a few key points made by Dave and chuck in a couple of others.
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Points to consider Flooring • Determine EMC and likely EMC range for
site • Always assess/measure MC before laying • Wider boards more problematic • Dense species need robust/stronger fixings • Don’t skimp on expansion joints/allowance • Possible impacts of different finishes
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Assess EMC/environment
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Measure MC before laying
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Wide boards more problematic Dense species – stronger fixings
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Fixing methods are critical
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Don’t skimp on expansion
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Type of finish
The higher the gloss, the more evident minor surface blemishes
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TQ Technical Data Sheets
More Information
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Technical Design Guide Timber Flooring
More Information
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Cladding, decking and flooring
SUMMARY: • Local resources provide you with access
to diverse range of world’s best timbers • Correct design, specification, installation
and maintenance will ensure satisfactory long term performance
• Information to support this is readily available
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Thank you