Load Span Tables & Joist Designation For PRI-400
I-Joists
General Floor Construction
Span Table 1 covers general domestic floor construction which is
up to 22 mm thick chipboard decking (this includes alternatives
such as plywood, solid lumber and OSB forms of deck) and a 15 mm
thick plasterboard ceiling. An allowance of 35 kg/m2
has been made in the span table to incorporate this construction
This span table is also applicable to ground floors where insulation
of 150 mm of mineral wool is suspended in a net membrane or grey
fibreboard support is provided.
Allowance for double spans (variable) and partition loads is also
given.
To illustrate the selection of an APA PRI product, assume a design
for a 0.345 kN/m2 dead load and a single span of 4.9
m. Further assume the joist depth is limited to 302 mm or less and
a joist spacing of 400 mm on centre or less. In the table below,
look down the 400 mm on centre spacing column. For depths of 241
mm (9-1/2"), select 9-1/2"PRI-60 .As an alternative, from
the 302 mm (11-7/8") depth notice that any joist designation
will work.
The spans shown in this table are based on repetitive member usage.
Use of this table is limited to uniform load conditions with a deflection
limit of L/480 of the span.
APA PRI’s can be used for other applications when properly engineered
using the appropriate design properties - see Table 4 in Form No.
EXP A725 UK Issued October 2000 - APA Performance Rated I-Joists
for United Kingdom.
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