I-Joists are unstable until laterally
braced!
These
instructions are offered as general recommendations and in some
instances other and/or
additional precautions may be necessary.
Erection
and bracing procedures and the workers' safety are the responsibility of
the builder.
Do not
allow workers or construction loads on unbraced I-Joists!
These
details may also be used with timber frame construction.
Longitudinal Bracing
1. Use at least 19 x 89mm bracing members nailed to each
I-Joist with two 3.35 x 65mm nails. Use
long pieces, not short lengths. Lap the
ends to keep a continuous line of bracing.
2. Braces are required at the ends of each I-Joist and at
interior supports of continuous I-Joists. Keep
the braces parallel and a maximum of 2.4m
apart. Longitudinal braces must be tied to a diagonally
braced and blocked system at one end of each
I-Joist run or joist bay.
3. Additional braces and blocking systems may be required
e.g. around stairwell openings.
Diagonal Bracing
1. Use at least 19 x 89mm bracing members nailed to each
I-Joist with two 3.35 x 65mm nails.
Use continuous pieces.
2. Diagonal braces must be installed at one end of each
I-Joist run or I-Joist bay. In long joist runs
install additional diagonal bracing systems at
not more than 10m spacing.
3. Diagonal bracing must be fixed to a minimum of 3
I-Joists to cover a distance of at least 1.2m.
Temporary Stability Blocking
1. Temporary stability blocking should be a minimum cross
section of 38 x 125mm solid timber.
Fasten with at least two 3.35 x 65mm nails at
each end. Alternatively the required permanent
blocking may be fitted e.g. for cantilever
joists (see Finnforest Installation details).
2. Blocking should be cut accurately to length with square
ends to maintain Finnjoist centres.
3. Blocking must be fixed between at least 3 I-Joists or to
cover a minimum distance of 1.2m.
4. Blocking must be installed at the supports of I-Joists
including interior supports of continuous I-Joists
where the overall length of the Finnjoist
exceeds 6.0m.
5. Blocking must be installed at one end of each I-Joist
run or I-Joist bay. In long joist runs install
additional blocking systems (temporary
stability blocking and diagonal bracing) at not more than
10m spacing.
Construction Loads
Please contact Finnforest Technical Support for guidance on 01205
883 835.
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