November 2022

What is Leaching or Tanning Bleed? Leaching or tannin bleed, is when weather exposed timber cladding, screening, decking or structural timbers bleeds brown extractives onto the surrounding surfaces. It is important to be mindful of the consequences of tannin bleed when planning your build. Tannins are natural extractives present in most timbers which leech during […]

What is Iron Staining? Iron stain, is a blue–black or grey discoloration that can occur on nearly all timber. The discoloration is caused by a chemical reaction between extractives in the wood and iron in steel products, such as nails, screws, fasteners, metal chains and other appendages. This often occurs after rain or dew, when