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Span Table notes
1. Service Class 1 is
suitable for immediate floors in
normal heated domestic dwellings. For
other
applications, please contact Finnforest
Technical
Support (01205 883 835) or your local
distributor.
2. All loads are assumed to be uniformly distributed.
3. Load sharing and adequate lateral restraint to the
flanges is taken account of in the
design. Joist span
tables assume that ceiling and decking is fixed
in
accordance with the appropriate British
Standards.
4. Spans are clear spans i.e. between supports.
Minimum
end bearing length required is 45mm.
5. The applied live load is 1.5kN/mē for single occupancy
domestic dwellings.
General Notes:
a. Finnforest recommend
that the decking is to be glued
and fixed in accordance with British
Standards. This
can significantly improve the floor
performance.
b. Deeper I-Joists will perform better than shallower
I-Joists due to better deflection performance.
c. The depth of the floor decking influences performance
with deeper floor decking improving stiffness.
d. Appropriate strutting of the joists may increase the
floor
stiffness. Consult Finnforest for advice
(01205 883 835)
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6. Web stiffeners are not
required for the spans listed
above unless hangers do not laterally restrain
the top
flange.
7. The dead load condition for this table is based on the
floor make-up shown on page 11.
8. Dead load condition is based on 22mm particle board
decking and a 15mm plasterboard ceiling plus an
allowance for non-load bearing partitions up to
0.8kN/m.
9. Performance classes as defined on performance page
screen.
10. Span tables are calculated in accordance with EC5.
11. Consult Finnforest Technical Support for further
information and conditions outside of the
tables (01205
883 835) or your local distributor.
e. Correct bearing line and
level is essential for in-service
performance.
f. When using joist hangers ensure the correct joist
hanger matched to joist type is used and that
all nails
are correctly specified and used.
g. Avoid using unspecified nails into the side of the
flange
as this can lead to splitting.
h. On no account is the flange to be cut. For service
holes refer to holes on tables on hole
construction
screen.
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