The importance of end sealing timber cladding and decking

Too often the first place of failure in timber cladding or decking in exterior applications is the exposed end grain.

Fungal decay requires moisture to develop, and the end grain of wood absorbs moisture at up to 100 times the rate of absorption of the face of wood.

This means that on average, the end grain retains more moisture than other parts of the wood, and is more likely to decay first. This issue affects both treated timbers, and naturally durable species such as Spotted Gum, Blackbutt, and Ironbark (all durability class 1 species).

It is critical therefore, that the cut ends of wood are sealed prior to application with an end sealant.

Any cutting of timber, whether from sawing, shaping or planning has the potential to expose the end grain and allow the uptake of moisture.

End sealants are available as a wax-based water repellent, designed to block moisture ingress, or as a chemical preservative, intended to protect the wood from fungal development.

At Abodo we supply a complete system of FSC® Vulcan and Tundra timber cladding and coatings, including Protector Oil, and Sioox, each have their own End Sealer.

With no adequate room allowed for drainage and no quality end sealer applied, this cladding will quickly succumb to decay.

This Tech Tip was supplied by NZCB National Partners, Abodo Wood Limited. Abodo craft timbers with lasting beauty that are safe for people and the environment. Formed in 2001, Abodo remains a New Zealand-owned, family business with a purpose. For more information visit www.abodo.co.nz.

To find out more on:

• Protector Oil End Grain Sealer – visit https://www.abodo.co.nz/products/accessories/ protector-end-seal • Sioo:x Natural Wood Coating End Grain Sealer – visit https://www.abodo.co.nz/products/accessories/ sioox-end-grain-sealer