How do you prevent colour leaching from vertical cladding?

We can’t stop tannin leaching from timber. however there are methods to minimize it. The common method is to clean timber with a tannin stripper such as Cutek Pro-clean or similar, and ensure end-grain of cladding boards are sealed with Sika-Flex or similar. Other option is to specify timber species which do not leach tannin such as Jarrah, Ironbark or our Thermally Modified Radiata Pine or Ash.