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Normally bark is laid at least 10cm thick to suppress the growth of weeds and up to 30cm deep in childrens areas. Generally speaking, the more you put down the longer it will last before it needs to be replaced.
Be mindful some compaction will occur with soil and
compost products. Allow up to 20% for compacting in garden beds etc.
Try this:
1cm | .010 | 10cm | .100 | |
2cm | .020 | 15cm | .150 | |
3cm | .030 | 20cm | .200 | |
4cm | .040 | 25cm | .250 | |
5cm | .050 | 30cm | .300 | |
6cm | .060 | 50cm | .500 |
1" Inch thick | .025mm | 7" Inch thick | .175mm | |
2" Inch thick | .050mm | 8" Inch thick | .200mm | |
3" Inch thick | .075mm | 9" Inch thick | .225mm | |
4" Inch thick | .100mm | 10" Inch thick | .250mm | |
5" Inch thick | .125mm | 11" Inch thick | .275mm | |
6" Inch thick | .150mm | 12" Inch thick | .300mm |