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External corners

Specification notes:

  1. These drawing are for cladding fixed to a timber framed structure. For masonry walls the same batten and cladding configuration may be used.
  2. Masonry walls shall be protected from any potential water penetration by use of a water repellent coating or breather membrane.
  3. Batten configuration shall not impede drainage or the free circulation of air behind the clad surface.
  4. Batten treatment: Softwood battens shall be pre-treated by an industrial process in accordance with BS8417 for a BSEN335:1 Use Class 3 application (Wood Protection Association Commodity Specification Code: C6 also known as NBS Z12/120)
  5. Corner cover strips are available in solid section or pre-formed profiles as shown in the images below. Figure 6c also includes machined grooves on the reverse face to prevent the movement of moisture by capillary action.
  6. Leave an expansion gap between the board ends and the corner finishing detail. The size of this gap may vary depending on the type of wood being used. Traditionally, this gap is between 8 and 10mm but when a low movement modified wood is used it can be 4-6mm.
  7. A 3mm gap shall be left between the up-stand and/or rebate of horizontal cladding to allow for any expansion of boards in the event of an increase in moisture content.

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