Issue 49 – May 2013
Tiled floors are susceptible to movement, so joist spacing should not exceed 400 mm.
To prevent deflection in the substrate between joists, BRANZ also recommends reducing the spans given in NZS 3604:2011 Timber‐framed buildings by 20%.
Maximum deflection for tiled floors is 1/360 of the span.
Where large tiles are used or the span is over 3 m, reduce the deflection to 1/480.
→ For more information on tiling, see Good Practice Guide: Tiling on the BRANZ website
Summarised from BRANZ Guideline April 2013.