James Hardie document
James Hardie External Cladding Technical Specification
The official James Hardie technical specification for external cladding, covering Hardie Flex sheet, Primeline Weatherboard and Hardie Plank Weatherboard on timber or steel framing. It covers framing and fixing, fastener selection and stud spacing by wind category, moisture management and weather barriers, jointing and corners, and product durability. Read it on this page or download the PDF.
What this covers
- Framing & Fixing Requirements
- Fastener Selection & Durability
- Stud & Fastener Spacing By Wind Category
- Moisture Management & Weather Barrier
- Jointing & Corners
- Ground Clearances & Termite Protection
Applies to HardiePlank Weatherboard and PrimeLine Weatherboard.
Key things to remember
The essentials from this guide, at a glance.
- Hardie Flex sheet comes in 4.5mm and 6mm thicknesses; Primeline Weatherboard is 9mm and Hardie Plank Weatherboard is 7.5mm.
- At least class 3 external-grade fasteners must be used on all external work, and class 4 within 1km of the coast or in corrosive areas.
- Fix 4.5mm and 6mm Hardie Flex sheets with 2.8 x 30mm fibre cement nails to timber, or 41mm HardieDrive screws to 0.5 to 1.6mm BMT steel.
- Sheet fasteners must sit no less than 12mm from sheet edges and 50mm from corners; 4.5mm sheets must not be used as bracing.
- Install cladding with a minimum 150mm clearance to the ground and keep the underside at least 50mm clear of horizontal flashings.
- Weatherboards use 2.8 x 50mm fibre cement nails, are pre-drilled 20mm from ends, and Hardie external cladding must be painted within 90 days of installation.
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This is the official James Hardie James Hardie External Cladding Technical Specification. Read it on this page or download the PDF. For the most current version, please confirm with James Hardie.