Shiplap cladding is known for its overlapping profile that creates a subtle shadow line, adding depth and character to your project. Its design helps protect against the elements by providing excellent water runoff, making it ideal for outdoor applications. It’s easy to install, durable, and suits a wide range of architectural styles.

Tools & Materials You'll Need

• Shiplap cladding boards
• Treated timber battens
• Fixings (use stainless steel screws or nails to prevent corrosion)
• Breathable membrane
• Drill or nail gun
• Saw (hand or power)
• Spirit level and tape measure
• Weatherproof finish
• Safety gear/PPE

Step 1: Surface Preparation

Start by preparing the wall where the cladding will be installed.

• Inspect the surface: Ensure it’s clean, dry, and structurally sound.
• Attach a weatherproof membrane: Temporarily secure it with tape, then fix it properly with galvanized staples, nails, or screws with washers. This will act as a moisture barrier and promote ventilation.

Step 2: Install the Battens

Treated timber battens provide the framework needed to support the cladding and create a ventilated cavity behind the boards.

Choose the correct batten direction: The direction of your battens depends on how the shiplap will be installed:

• Horizontal shiplap: Install the battens vertically.
• Vertical shiplap: Install the battens horizontally.

Spacing: Space the battens approximately 400–600mm apart, adding additional battens around windows, doors, corners, and other openings where extra support is required.

Secure the battens: Use fixings suitable for the wall construction to securely attach the battens.

Step 3: Prepare the Shiplap Boards

• Inspect your boards: Check for any defects and allow the boards to acclimate to site conditions for 5–7 days. This minimises movement after installation.
• Cut to size: Use a saw to cut the boards to the required length, leaving a 2mm gap at edges for expansion.

Step 4: Start Cladding

You can now begin installing the shiplap boards.

For horizontal installation: Start with the lowest board and work upwards. Ensure the first board is perfectly level, as this will determine the alignment of all subsequent boards.

For vertical installation: Start at one side of the wall and work across. Ensure the first board is perfectly plumb (vertical), as this will determine the alignment of the remaining boards.

Position correctly: Whichever direction you install the boards, ensure the profiled shiplap joint is correctly orientated so that it sheds water away from the wall. The profiled edges should engage neatly with one another rather than simply overlapping.

Step 5: Fix the Boards

Secure the first board: Fix the first board to the battens using suitable stainless steel nails or screws. Follow the recommended fixing position for the specific shiplap profile to avoid restricting the timber's natural movement.

Fit the next board: Position the next board alongside the previous board for vertical installation, or above the previous board for horizontal installation. Engage the profiled edge into the corresponding profile of the adjacent board to create a consistent shiplap joint and shadow line.

Check alignment: For horizontal installation, regularly check that the boards remain level. For vertical installation, check that they remain plumb as you work across the wall.

Repeat: Continue installing and fixing each board until the area is fully covered.

Step 6: Finishing Touches

• Cut to fit: Neatly trim boards around windows, doors, and other openings for a polished look.
• Add trims and mouldings: Use corner trims and edge mouldings to give the installation a professional finish.

Step 7: Protect Your Timber

To enhance the durability and appearance of your shiplap cladding:

• Apply a protective finish: Use an oil, stain, or paint to preserve the timber’s natural colour and protect against weathering.
• Reapply as needed: Regular maintenance will keep your cladding looking great for years to come.