My cladding appears to be leaching extractives onto other materials, what can I do?
Typically, this can happen when boards are left unfinished. As the boards weather, they can leach out extractives that can stain other boards, or the surfaces of other materials below or adjacent to them. Special care should be taken when using timber cladding above absorbent materials, as stains may be difficult to remove. It is advisable to protect these surfaces from the runoff during the initial weathering process. This process is temporary and should stop once the boards have begun to weather down to a silvery-grey colour.
For more detailed information about timber cladding, take a look at our book External Timber Cladding, a comprehensive guide to the design and specification of timber cladding.
We also provides a range of services for building designers and product manufacturers to assist with timber cladding queries, as well as training and cpd.
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