Application > Timber external walls
Application - External Timber Walls
Natural Wood Fibre rigid Sheathing & Sarking boards are installed over the external timber frame of a building providing an air tight, water repellent, insulating, noise proofing layer.
Water resistant (acts as a sarking board)
Excellent insulating properties
Boards can be exposed to the elements for up to two months
Excellent soundproofing qualities
Vapour open. Allows trapped moisture in the wall fabric to escape
Reduces thermal bridging in the building elements
Tongue & Groove on all 4 sides preventing unwanted air drafts
Prevents dust blowing into the building envelope
Provides structural strength to the building element
Versatile - boards can be covered with a cladding material or with a natural based render
Good fire resistant qualities (see video)
Easy to cut & install
Perfect for timber structures
The rigid insulation boards and high density gives them structural properties. Install them as you would any other sheathing material such as Plywood or OSB.
Can be cladded over
The insulating boards are fixed to the frame with timber battens & screws. Cladding such as timber, fibre cement or metal are then fixed to the battens.
The battens provide an ventilation gap between the insulating board and the back of the cladding; allowing trapped moisture in the building fabric to evaporate.
Water repellent boards
The wood fibre insulation boards are hydrophobic meaning they repel water. They act as second water protection layer behind your cladding.
They can be left unfinished for several months allowing you to get your house secured from the elements.
Suitable for a render finish
The sheathing and sarking board is very versatile. It can be finished with a natural lime render or earthen render.
Boards fixed over a timber frame
The sheathing boards can be temporarily secured to the timber frame with typical wood screws. Battens can then be fixed over the boards and secured into place with timber screws.
For rendered boards
If you are planning to render the board; they can be secured to your timber frame using large head stainless steel staples or specialized screws with a plastic washer.
Need more technical information ?
You can download the a guide to the Installation Guides to the Rigid insulating Sheathing & Sarking boards; as well as the board's Product Data Sheet our Downloads section.