In order to deliver the desired service life, any coating applied must be maintained in good condition in accordance with the manufacturer’s guidance.
The ease of access and requirement for maintenance will largely determine what product is selected.
Surface coatings work best on timbers that are dimensionally stable or have a low potential for moisture change movement. Surface texture is also important and coatings generally perform better applied to sawn rather than smooth planed timber. The process of preservative treating or modifying wood has a positive impact on coatings adhesion.
Various types of coatings are suitable for cladding ranging from clear, water repellents to translucent pigmented and solid stains and paints. Products can be applied by brush or spray on site but it is the full factory finishing of cladding with an extended maintenance system that is best for long term performance.
With site applied coatings, TDCA recommends that at least one coat is applied to all faces including the end grain, prior to installation. Further coats can then be applied to the visible face.