What is shiplap cladding?

Shiplap is a timber cladding profile machined with a rebate along the top and bottom edges of each board. When boards are fixed horizontally, the rebate on the bottom of one board slots over the top of the board below, creating a tight, interlocking joint that sheds water effectively and gives a neat, uniform appearance. It is one of the most widely used profiles for garden buildings and outdoor timber structures.

What is the difference between shiplap and feather edge cladding?

Both are popular choices for outdoor timber cladding, but they differ in profile and appearance. Shiplap has a uniform thickness with a rebated interlocking joint, giving a clean, modern horizontal line finish. Feather edge boards are tapered and overlapped rather than interlocked, giving a more traditional close-board appearance. Shiplap is generally considered easier and faster to install due to its self-aligning rebated profile.

What is the difference between shiplap and tongue and groove cladding?

Tongue and groove (T&G) boards have a projecting tongue on one edge that fits into a groove on the adjacent board, creating a flush joint. Shiplap uses a rebated overlap joint rather than a flush fit, making it better suited to exterior applications where water shedding is a priority. T&G is more commonly used for interior lining, flooring, and applications where a flat, seamless surface is required.

How long will treated shiplap last outdoors?

Pressure treated shiplap used in above-ground applications such as shed and summerhouse cladding typically has a service life of 15 years or more when correctly installed and maintained. Applying a good quality exterior timber stain or paint every few years will enhance protection and extend the life of the cladding further. Ensuring adequate ventilation behind the cladding and avoiding ground contact will also help maximise longevity.

Can treated shiplap be painted or stained?

Yes. Once installed and given sufficient time for any residual moisture from the pressure treatment to dry out — typically 2–3 months — treated shiplap can be finished with a suitable exterior timber paint or stain. A microporous finish is recommended as it allows the timber to breathe while providing excellent protection against the elements. Regular maintenance of the finish will significantly extend the life of the cladding.

Treated shiplap cladding 12mm x 120mm - Cain Brothers Timber Merchants

Description

Treated shiplap cladding 12mm x 120mm is a versatile and attractive timber product used extensively in the construction and cladding of garden buildings, sheds, summerhouses, playhouses, and a wide range of outdoor timber structures. The distinctive rebated profile of shiplap allows each board to slot neatly into the one below, creating a tight, weatherproof overlap joint that locks out wind and rain while giving a clean, horizontal lined finish that is both practical and visually appealing.

Each board is machined to a consistent 12mm thickness and 120mm width, making them easy to work with on site and straightforward to calculate quantities for any project. The pressure treatment process forces preservative deep into the timber fibres, providing long-lasting protection against rot, fungal decay, and insect attack from the inside out. This makes treated shiplap a far more durable choice than untreated alternatives, significantly reducing ongoing maintenance requirements and extending the working life of the structure.

The interlocking rebated profile means boards can be fixed quickly and accurately, with each board self-aligning as it slots over the one below. This makes shiplap one of the most installer-friendly cladding profiles available, whether you are an experienced joiner or a confident DIYer tackling a garden building project.

Suitable for use on new builds and as a replacement cladding material on existing structures, 12mm x 120mm treated shiplap is a tried and tested product trusted by builders, landscapers, and garden building manufacturers across the UK.

Key features:

12mm x 120mm rebated shiplap profile
Pressure treated for long-term rot and decay resistance
Interlocking profile for fast, accurate installation
Creates a tight, weatherproof joint between boards
Ideal for sheds, summerhouses, garden buildings, and outdoor structures
Consistent machined dimensions throughout
Available in bulk quantities for larger projects
Suitable for new build and replacement cladding applications

Additional information

Shiplap	Per meter

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