The following is a guide only and all cladding installations should be carried out by an experienced installer using the correct tools and safety equipment to ensure a perfect finish.
The bottom cladding plank is then located firmly in the starter trim and vertical trims, and fixed into place.
BS8200:1985 and NHBC Standards Chapter 6.2:1992 - A continuous 10mm ventilation pathway must be maintained behind the cladding with minimum 5000mm2 ventilation slots per metre run at the top and bottom.
Other relevant documentation - Zurich Building Guarantees 1998 (19mm cavity width)
IMPORTANT: Provisions must be made to allow water that has penetrated behind the cladding to drain away. Ventilation is achieved by drilling through the starter trim and top finishing trim - refer to building regs for numbers and sizes.
Maximum windloading based on 600mm batten spacings
- 100mm cladding... 2000Pa
- 150mm cladding... 1350Pa
For increased windloadings reduce batten spacings and fixing centres and check with qualified engineer. As a guide, 400mm batten spacings should be considered for applications over 2 storeys.
- For applications involving non weatherproof substrates (e.g.timber stud wall) a vapour permeable water barrier must be installed behind the battens and cladding.
- When used as a decorative facing on a weather tight masonry wall, a water barrier is not generally necessary. The same applies for fixing distances.
- Cladding should not be taken into account when designing a timber stud to resist racking forces.
- Do not install cladding at ground floor level where severe impacts will occur.
Start by fixing battens to the building framework as described on page 35. Battens will also need to be fixed around the periphery of any openings e.g. a window.
• Before fixing the initial starter trim, make a final inspection of the building substrate and check if any special consideration needs to be taken into account with regards to drainage and ventilation.
• Working from a line level, fix the starter trim to the lower timber batten.
• Use 20mm trim nails.
• All vertical trims should then be fixed to perimeter battens.
• Top trims and trims around windows should also be fixed to perimeter battens.
• Fix the back half initially and clip the cover on after cladding has been fitted.