Question 1

What is the difference between rebated halflap shiplap and standard shiplap cladding?

Accepted Answer

Standard shiplap uses a simple rebate on one edge so boards overlap face-to-face. Rebated halflap shiplap has a matching rebate cut into both the top and bottom edges of each board, which creates a tighter, more precise fit that reduces gaps and improves weather resistance without relying on a thick overlap.

Question 2

Does the pressure treatment mean I don't need to apply a finish?

Accepted Answer

The pressure treatment protects the timber against rot and insect attack, but it does not provide a decorative finish or full UV protection. Applying an exterior paint, stain or preservative oil will protect the surface from weathering and help maintain the appearance of the cladding over time.

Question 3

How do I calculate how many boards I need for my project?

Accepted Answer

Divide the total wall area you need to cover by the effective cover width of 110mm (0.11m). For example, a wall 2.4m high and 3m wide gives 7.2 square metres, which at 0.11m cover per board requires approximately 66 linear metres of cladding. Always add 10 per cent for waste and cutting.

Property	Detail
Material	Scandinavian redwood
Treatment	Pressure treated for rot and insect resistance
Profile	Rebated halflap shiplap
Nominal Size	16mm x 125mm
Finished Size	Approx. 12mm x 120mm
Effective Cover	110mm per board
Lengths Available	3.9m, 4.2m, 4.5m, 5.4m
Use Class	Suitable for exterior use

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Shiplap Claddings

Treated Rebated Halflap Shiplap Cladding 16mm x 125mm