Page 37 - Pocket Guides
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PG 20
   PG 1-2

   NOTCHES AND HOLES IN JOISTS
                               FIG 3. LIMITS FOR DRILLING OF
                               JOIST WHERE NO NOTCHING
                ≤0.4L
                               HAS BEEN CARRIED OUT
            ≥0.1L
                                                   0.5D
      D ≤150                                       0.5D


                 Hole centres at least 3 x the diameter
                 of the largest hole apart
                            L
   Note:  A maximum of 8 × 30 mm holes is permitted within each drilling zone.
       No notching is permitted.


                               FIG 4. INSTALLATION OF WIRING
                               SYSTEMS IN METAL WEB JOISTS
                        Don’t drill holes
                        in the timber chords


      Don’t cut through
      the timber chords                Don’t cut notches
                                      in the timber chords


                   Do use web opening
                         for sevices

                             Don’t cut or remove
                          any of the metal webbing



   FIG 5. DRILLING/NOTCHING OF
                                  Do not notch timber
   TIMBER-ENGINEERED JOISTS
                                                Do not make
                                              holes in timber




                                   Do not notch timber
                            Do not drill timber




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