Window Details

HardiePlank Installation

Window Trim Options

  • Same or contrasting colour
  • NT3 decorative trim options
  • HardiePlank boards cut for cills
  • HardiePlank also use in reveals
  • Potentially use of board/trim offcuts

Phone to order

01803 813 803

Lines open 7:30 - 17:00 Mon - Fri

Product Details

HardiePlank® cladding is an 8mm thick weatherboard plank, to be used as external or internal cladding for both new build and renovation projects. To complement the product, both fibre cement and metal trim profiles are available to finish corners, door and window frames.

The first row of HardiePlank is usually fitted with a 25mm, 38mm or 50mm starter profile depending on the batten size used.  A minimum of 1500mm is allowed for ground clearance on this first board.  Then the second row of HardiePlank® cladding is placed so that the lower edge of the second plank overlaps the top of the first plank by 30mm. Using a Gecko Gauge set to 150mm for speed, or manually measure 150mm up from the top edge of the plank and draw a line on the battens, this gives the position for the top edge of the next plank. It is advisable to check with a spirit level every 4 or 5 rows to ensure the planks level is maintained

Cut the HardiePlank boards neatly so that it finishes at the centre line of the timber batten. Stagger the butt joints in an area of wall over two or more batten lines, so that joints are not located directly in the same vertical line.  EPDM tape must be placed underneath each joint. James Hardie recommend that 1 mm joint spaces are left around windows, doors and trim edges to allow for a degree of building movement and product tolerance. It also provides a natural vertical drain for rainwater.

When using HardieTrim® profiles at the corners of buildings and around window reveals, then two battens should be installed side by side. One batten is for the trim to be fixed to, the other batten provides a fixing point for the HardiePlank. A strip of EPDM gasket must be stapled to the batten the full height of the planked area at a point where the trim and plank butt up. This is to protect the batten from water damage. Ensure that the trim is installed in the correct order. JamesHardie recommend that the planks and trims are not mitred to form a ‘picture frame’, all joints must be butt joints.