SmartFrame Subfloor Design Guide - Tilling Timber

FLOOR BEARERS SUPPORTING ROOF VIA SINGLE OR UPPER
STOREY LOADBEARING WALLS - Wind Classification: N1 - N3
Example:
Roof load width
Load
bearing
wall
Bottom plate
Bearer span
Single or
Upper storey
bearer
Floor joists
Floor load width
Sheet roof - 40 kg/m 2
Roof load width = 1450 mm
Bearer span = 1500 mm
Floor load width = 1500 mm
Enter Single Span table at 2400 mm in floor load
width column, 1500 roof load width column, read
down to a span equal to or greater than 1500 mm
in the 40 kg/m 2 row.
SmartLVL 15 : 130 x 45
Sizes in Italics are non standard LVL (F17) sizes. Check availability with your SmartFrame stockist before ordering.
Floor Load Width
(mm)
Roof Load Width
(mm)
Roof
Size DxB Mass
1200 2400 4800
1500 4500 7500 1500 4500 7500 1500 4500 7500
Span C'lever Span C'lever Span C'lever Span C'lever Span C'lever Span C'lever Span C'lever Span C'lever Span C'lever
(mm) (kg/m 2 ) Maximum Single Span Subfloor Bearer Span (mm)
2/90x35 40 1700 500 1400 400 1200 300 1500 400 1300 300 1200 300 1200 300 1100 300 1000 300
90 1500 400 1100 300 1000 300 1300 300 1100 300 1000 300 1100 300 1000 300 NS NS
2/130x35 40 2400 700 2000 600 1800 500 2100 600 1900 500 1700 500 1800 500 1600 400 1500 400
90 2200 600 1700 500 1400 400 2000 600 1600 400 1400 400 1700 500 1400 400 1300 300
2/150x35 40 2800 800 2400 700 2100 600 2500 700 2200 600 2000 600 2000 600 1900 500 1800 500
90 2500 700 1900 500 1700 500 2300 600 1800 500 1600 400 1900 500 1700 500 1500 400
90x42 40 1400 400 1200 300 1000 300 1200 300 1100 300 1000 300 1000 300 NS NS NS NS
90 1200 300 1000 300 NS NS 1100 300 NS NS NS NS NS NS NS NS NS NS
120x42 40 1900 500 1600 400 1400 400 1700 500 1500 400 1300 300 1400 400 1300 300 1200 300
90 1700 500 1300 300 1100 300 1500 400 1200 300 1100 300 1300 300 1100 300 1000 300
130x42 40 2100 600 1700 500 1500 400 1800 500 1600 400 1400 400 1500 400 1400 400 1300 300
90 1800 500 1400 400 1200 300 1600 400 1300 300 1200 300 1400 400 1200 300 1100 300
140x42 40 2200 600 1800 500 1600 400 1900 500 1700 500 1500 400 1600 400 1500 400 1400 400
90 2000 600 1500 400 1300 300 1800 500 1400 400 1300 300 1500 400 1300 300 1200 300
150x42 40 2400 700 2000 600 1800 500 2100 600 1800 500 1700 500 1700 500 1600 400 1500 400
90 2100 600 1600 400 1400 400 1900 500 1500 400 1400 400 1600 400 1400 400 1300 300
2/90x42 40 1800 500 1500 400 1300 300 1600 400 1400 400 1200 300 1300 300 1200 300 1100 300
90 1600 400 1200 300 1100 300 1400 400 1200 300 1000 300 1200 300 1000 300 NS NS
2/120x42 40 2400 700 2000 600 1800 500 2100 600 1800 500 1700 500 1700 500 1600 400 1500 400
90 2100 600 1600 400 1400 400 1900 500 1600 400 1400 400 1600 400 1400 400 1300 300
2/130x42 40 2600 700 2200 600 1900 500 2300 600 2000 600 1800 500 1900 500 1700 500 1600 400
90 2300 600 1800 500 1500 400 2100 600 1700 500 1500 400 1800 500 1500 400 1400 400
2/140x42 40 2800 800 2300 600 2100 600 2500 700 2100 600 2000 600 2000 600 1900 500 1700 500
90 2500 700 1900 500 1700 500 2200 600 1800 500 1600 400 1900 500 1700 500 1500 400
2/150x42 40 3000 900 2500 700 2200 600 2600 700 2300 600 2100 600 2200 600 2000 600 1900 500
90 2600 700 2100 600 1800 500 2400 700 2000 600 1700 500 2100 600 1800 500 1600 400
90x58 40 1600 400 1300 300 1200 300 1400 400 1200 300 1100 300 1100 300 1000 300 1000 300
90 1400 400 1100 300 NS NS 1300 300 1000 300 NS NS 1100 300 NS NS NS NS
130x58 40 2300 600 1900 500 1700 500 2000 600 1800 500 1600 400 1700 500 1500 400 1400 400
90 2000 600 1600 400 1400 400 1800 500 1500 400 1300 300 1600 400 1400 400 1200 300
150x58 40 2700 800 2200 600 2000 600 2300 600 2000 600 1800 500 1900 500 1800 500 1600 400
NOTES
90 2300 600 1800 500 1600 400 2100 600 1700 500 1500 400 1800 500 1600 400 1400 400
ROOF LOAD WIDTH:
For definition of roof load width, see AS 1684.2.
1. The above table was based on a maximum DL of 40 (kg/m 2 ), Total Wall Mass of 15 (kg/m 2 ), Floor Live Load of 1.5 (KPa), Floor Point Load
of 1.8 (KN),
2. Minimum Back span = 200% of Overhang. Maximum Overhang = 30% of Back span.
BEARING LENGTHS:
End bearing lengths = 42 mm at end supports and 58 mm at internal supports for continuous members. Subscript values indicate the minimum
additional bearing length where required to be greater than 42 mm at end supports and 58 mm at internal supports.
SmartFrame Sub-floor Design Guide 16