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MERBAUwww.itimerbau.com.au
ENGINEERING SPANTABLES FOR BEAMS, RAFTERS, FLOOR BEARERS, FLOOR JOISTS AND POSTS.
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CONTENTS PAGE
Engineer’s structural certification
Verandah beam - wet use 450 roof overhang
Rafters - wet use
Floor bearers - wet use
Floor joists - wet use with deck
Roof posts - supporting roof only
Diagrams
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4
5
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7
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MERBAU IS A NATURAL PRODUCT & ONE OF THE TOUGHEST BUILDING MATERIALS AVAILABLE
Merbau like all timbers will react to climatic changes during its service life. We attempt to minimise the
effect these changes may have on the appearance of the product but resin bleed, raised grain or uneven
swelling may occur as a result of climatic conditions.
To reduce the risks we recommend the use of protective finishes to enhance the appearance and
improve the service life of the product. Protective finishes will prolong the service life of finger jointed and
laminated Merbau by limiting the effects UV light has on the product, reducing moisture ingress and aiding
with the dimensional stability of the product.
ITI Merbau features “Increased strength due to the laminating process - glulam is stronger than solid
timber as it has fewer natural defects and a wider distribution. It is also comparable to steel in strength
but is much lighter.”1 The glue used in the laminating process is Phenol Rescorcinol Formaldehyde
and is considered the industry standard for structural engineered wood applications. A high degree of
dimensional stability is also provided as glulam Merbau is manufactured from seasoned timber and is
therefore less prone to movement caused by changes in moisture content.
StressGrades
Characteristic strengths (MPa) Elastic molduli (MPa)
Bending Tension parallel to
grain
Shear in beam
Compression parallel to grain
Short duration average modulus of elasticity parallel to the grain
Short duration average modulus of rigidity for
beams
Fb Ft Fs Fc E G
GL13 33 16 3.7 33 13300 900
GL17 42 21 3.7 35 16700 1110
CHARACTERISTIC STRENGTHS AND ELASTIC MODULI FOR HORIZONTALLY LAMINATED GLULAM GRADES
1 http://www.woodsolutions.com.au/Wood-Product-Categories/Glulam - 17/12/2013
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STRUCTURAL CERTIFICATION
Ron O’Hara BE (Civil) MIPENZDavid King ME (Civil) MIPENZ CPEng IntPE
STRUCTURAL CERTIFICATION
SPAN TABLES FOR ITI Merbau range of products
Incorporating span tables for:
GL17 Floor and deck bearers and joists, GL17 rafters, ridge beams and verandah beams.
GL13 posts. I, David J King, being a Chartered Professional Engineer and currently holding an Annual Practising Certificate, certify that the span tables have been prepared using widely accepted engineering principles. Design loads and deflection criteria have been determined from AS/NZS 1170.0:2002, AS/NZS 1170.1:2002 Structural Design Actions and AS4055-2006 Wind loads for housing. Structural design is to the requirements of AS1720.1:2010 Timber Structures.
David King ME (civil) MIPENZ CPEng (no. 145511) New Zealand IntPE (NZ) 12 September 2013
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VERANDAH BEAM
Roof weight: 30kg/m²Roof overhang: 450mmRoof Snow Load: 0 kPa
N3 Wind Classification Wet Use Single Span GL17
42mm Beams
65mm Beams
LoadsRoof 0.3 kPaLive Load 0.25 kPa 1.1 kNSnow Load 0.00 kPa
Deflection limits
Dead Loads span/300 or 15mmLive loads span/300 or 12.5mmWind load span/250 or 15mm
Verandah Width
1200 1800 2400 3000 3600 4200 4800 5400 6000
140 x 42 3200 2950 2800 2650 2500 2350 2250 2150 2050
190 x 42 4150 3950 3750 3600 3350 3150 3000 2850 2700
240 x 42 4950 4700 4500 4150 3850 3650 3450 3250 3150
290 x 42 5750 5350 4850 4500 4200 3900 3700 3550 3350
Verandah Width
1200 1800 2400 3000 3600 4200 4800 5400 6000
140 x 65 3000 2700 2450 2300 2150 2000 1900 1800 1750
190 x 65 3000 2700 2450 2300 2150 2000 1900 1800 1750
240 x 65 5000 4750 4500 4350 4050 3850 3650 3450 3300
290 x 65 5350 5050 4850 4650 4400 4150 3950 3750 3600
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RAFTERS
Roof weight: 30kg/m²Roof Snow Load: 0 kPa
N3 Wind Classification Wet Use Single Span GL17
42mm Beams
65mm Beams
LoadsRoof 0.03 kPaLive Load 0.25 kPa 1.1 kNSnow Load 0.00 kPa
Deflection limits
Dead Loads span/300 or 20mmLive loads span/300 or 12.5mmWind load span/250 or 1mm
Rafter Spacing 600 760 900 1000 1200
70 x 42 1900 1800 1700 1650 1550
90 x 42 2500 2350 2200 2150 2000
140 x 42 3950 3650 3450 3300 3100
190 x 42 5100 4850 4650 4500 4250
240 x 42 6000* 5750 5500 5350 5150
290 x 42 6000* 6000* 6000* 6000* 5800
Rafter Spacing 600 760 900 1000 1200
140 x 65 4550 4200 4000 3850 3600
190 x 65 5700 5400 5150 5050 4800
240 x 65 6000* 6000* 6000* 6000 6000*
290 x 65 6000* 6000* 6000* 6000* 6000*
Notes1. Wind loads have been derived from AS 4055-1992, Wind loads for housing, with the net pressure coefficients (Cpn)of -1.5 and +0.7 for N winds and -2.5 and +1.05 for C winds.2. Stress grade of timber is GL17.3. Design to provisions of AS 1720.1:1997, Timber Structures.4. Spans may be increased by 10% for rafters continuous over 2 or more spans.5. Maximum 450mm overhang.
* Longest length ITI Merbau beam available is 6.0m
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FLOOR BEARERS
2.00kPa Wet Use Single Span GL17
42mm Beams
65mm Beams
LoadsRoof 0.4 kPaLive Load 4.0 kPa 1.8 kN
Deflection limits
Short term span/300 or 12mmLong term span/360 or 9mm 1kN 2mm
Verandah Width / Joist Span
1200 1800 2400 3000 3600 4200 4800 5400 6000
140 x 42 2150 1900 1650 1500 1350 1250 1200 1100 1050
190 x 42 2950 2600 2250 2050 1850 1700 1600 1500 1450
240 x 42 3550 3250 2850 2550 2350 2200 2050 1950 1850
290 x 42 4100 3800 3450 3100 2850 2650 2450 2350 2200
Verandah Width / Joist Span
1200 1800 2400 3000 3600 4200 4800 5400 6000
140 x 65 2500 2250 2050 1850 1700 1600 1450 1400 1300
190 x 65 3350 3000 2800 2550 2300 2150 2000 1900 1800
240 x 65 3950 3650 3450 3200 2900 2700 2550 2400 2300
290 x 65 4550 4200 3950 3750 3550 3300 3050 2900 2750
Notes1. Bearers designed to provisions of AS 1720.1:1997, Timber Structures.2. Timber grade GL17, wet use3. Bearers do not support roof loads.4. Allowance of 0.3kN/m added for balustrade.5. Spans may be increased by 10% for bearers continuous over 2 or more spans.
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FLOOR JOISTS
2.00kPa Wet Use - With Ceiling Single Span GL17
LoadsRoof 0.4 kPaLive Load 2.0 kPa 1.8 kN
Deflection limits
Short term span/300 or 12mmLong term span/360 or 9mm2mm for 1kN point load
42mm Beams
65mm Beams
Joist Size 400 450 600
70 x 42 1350 1300 1200
90 x 42 1750 1700 1550
140 x 42 2850 2750 2550
190 x 42 4000 3850 3550
240 x 42 4750 4600 4350
290 x 42 5450 5300 4950
Joist Size 400 450 600
140 x 65 3450 3300 3000
190 x 65 4400 4300 4050
240 x 65 5200 5050 4750
290 x 65 5950 5800 5450
Notes1. Joists designed to provisions of AS 1720.1:1997, Timber Structures.2. Timber grade GL17 - wet use3. Spans may be increased by 10% for joists continuous over 2 or more spans.4. Solid blocking required at midspan and at ends for joists with a span of 2.5m or greater.
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POSTS
N3 Wind Classification Supporting Roof Only GL13
Roof Weight 30kg/m² Steel Sheet (0.75) 13mm Plaster Ceiling
Terra-cotta or Concrete Tiles, BattensRoof Weight 60kg/m²
Tributary roof area (m2)
4 6 8 10 12 15 20 25 30
Post Size Maximum Post Height (m)
90 x 90 F/J Lam 4.50 4.50 4.30 3.70 3.30 2.80 2.10
115 x 115 F/J Lam & Solid Veneer
5.75 5.75 5.75 5.75 5.70 5.00 4.10 3.50
135 x 135 F/J Lam
6.00* 6.00* 6.00* 6.00* 6.00* 6.00* 6.00 5.20 4.50
140 x 140 SolidVeneer
6.00* 6.00* 6.00* 6.00* 6.00* 6.00* 5.60 5.00
190 x 190 Solid Veneer
6.00* 6.00* 6.00* 6.00* 6.00* 6.00* 6.00* 6.00*
Tributary roof area (m2)
4 6 8 10 12 15 20 25 30
Post Size Maximum Post Height (m)
90 x 90 F/J Lam 4.50 4.40 3.70 3.20 2.70 2.30 1.60 0.90
115 x 115 F/J Lam & Solid Veneer
5.75 5.75 5.75 5.60 5.00 4.30 3.50 2.80
135 x 135 F/J Lam
6.00* 6.00* 6.00* 6.00* 6.00* 6.00* 5.20 4.40 3.80
140 x 140 SolidVeneer
6.00* 6.00* 6.00* 6.00* 6.00* 5.60 4.80 4.20
190 x 190 Solid Veneer
6.00* 6.00* 6.00* 6.00* 6.00* 6.00* 6.00* 6.00*
* Longest length ITI Merbau beam available is 6.0m
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DIAGRAMS
Verandah Roof Beam
Rafters
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DIAGRAMS
Deck Bearer
Floor or Deck Bearer
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DIAGRAMS
Deck Joists
Floor or Deck with Cantilever Joist
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DIAGRAMS
Posts
Copyright reserved. 2013 ITI Australia.Every effort has been made to ensure the information contained in this booklet complies with the Building Code at the date of publication. No responsibility is accepted for any errors or omissions in this booklet or for any work or specification based on this information.
MERBAUwww.itimerbau.com.au S
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Sizes Grade Finish Available lengths
AVAILABLE IN A WIDE RANGE OF POST, BEAM AND NON-STRUCTURAL SIZES
90 x 90mm GL13 F/J Laminated 2.4, 2.7, 3.0, 3.6, 4.8, 5.4, 6.0m
115 x 115mm GL13 F/J Laminated 2.4, 2.7, 3.0, 3.6, 4.8, 5.4, 6.0m
140 x 140mm GL13 F/J Laminated 2.4, 2.7, 3.0, 3.6, 4.8, 5.4, 6.0m
190 x 190mm GL13 F/J Laminated 2.4, 2.7, 3.0, 3.6, 4.8, 5.4, 6.0m
POSTS
190 x 30mm GL17 F/J Laminated 6.0m
70 x 42mm GL17 F/J Laminated 5.4, 6.0m
90 x 42mm GL17 F/J Laminated 3.6, 4.8, 5.4, 6.0, 7.2m
140 x 42mm GL17 F/J Laminated 3.6, 4.8, 6.0, 7.2m
190 x 42mm GL17 F/J Laminated 3.6, 4.8, 6.0, 7.2m
240 x 42mm GL17 F/J Laminated 3.6, 4.8, 6.0, 7.2m
290 x 42mm GL17 F/J Laminated 3.6, 4.8, 6.0, 7.2m
140 x 65mm GL17 F/J Laminated 3.6, 4.8, 6.0, 7.2m
190 x 65mm GL17 F/J Laminated 3.6, 4.8, 6.0, 7.2m
240 x 65mm GL17 F/J Laminated 3.6, 4.8, 6.0, 7.2m
290 x 65mm GL17 F/J Laminated 3.6, 4.8, 6.0, 7.2m
66 x 18mm F/J DAR 5.4m
42 x 30mm F/J DAR 5.4m
42 x 10mm F/J Cover Strip 5.4m
18 x 18mm F/J Quad 5.4m
30 x 30mm F/J Scotia 5.4m
BEAMS
Non-Structural
For more information please contact your ITI Rep or contact your local ITI office
ITI SA: 08 8347 7011
90 x 19mm F/J DAR 5.7m
Decking