Strongbacks are installed within the MSJ/SWJ/SJs at right angles to the direction of the joists and are used to dampen the vibrations by increasing the stiffness of the floor system and reduce deflection by load sharing.

Strongbacks must be fixed to the vertical webs in each MSJ/SWJ/SJ with 2/3.05 x 75mm nails.

Strongbacks can be located either to the underside of the top chord or sit on the bottom chord.

Timber Splice to Strongback

Figure E5-02-02-01

Nailplate Splice to Strongback

Figure E5-02-02-02


Figure E5-02-02-06

Change of span

Figure E5-02-02-04