Description
Quick answer: 19x125mm treated redwood shiplap cladding is used to clad sheds, garden buildings, workshops, summerhouses and other outdoor timber structures. The rebated shiplap profile overlaps to help shed rainwater and create a neat external timber finish, with a finished size of approximately 14.5mm x 119mm after machining.
What is this used for?
This pressure treated redwood shiplap cladding is used to protect and finish external timber buildings. It is commonly used for sheds, garden buildings, summerhouses, workshops, outbuildings, storage structures and replacement cladding repairs.
The shiplap profile creates an overlapping joint between boards, helping rainwater run off the face of the cladding while giving the building a clean, consistent timber finish.
Is this the right cladding for your project?
Choose treated shiplap cladding if you want a traditional timber cladding board for an outdoor structure such as a shed, garden room, workshop or outbuilding. It is a practical choice where you want a neat finish, weather-shedding profile and pressure treated timber for exterior use.
This product is designed as cladding, not as structural framing. The building still needs a suitable frame, fixing battens or support structure behind the boards. Good installation matters, including correct board overlap, exterior-grade fixings, cut-end treatment and ventilation behind the cladding.
What does shiplap cladding mean?
Shiplap cladding has a rebated edge that allows one board to overlap the next. This creates a tidy horizontal joint and helps shed rainwater away from the building.
Compared with square-edged boards, shiplap gives a more weather-shedding external profile and a more finished appearance. It is commonly chosen for sheds, garden buildings and other outdoor timber structures where a traditional cladded look is wanted.
Size and finished dimensions
This cladding is sold as 19mm x 125mm pressure treated redwood shiplap. After machining, the finished size is approximately 14.5mm x 119mm.
The stocked board length is 4.8m / 4800mm / 16ft. Choose your quantity based on the area being clad, board coverage, cutting waste, openings, corners and the direction you are fitting the boards.
Size note: Imperial sizes are provided as a familiar reference only. All timber is sold in metric measurements, so please use the listed metric size when ordering or checking suitability for your project.
Key features
- Pressure treated redwood: Treated for exterior cladding use on sheds, garden buildings and outdoor structures.
- Shiplap profile: Rebated overlap helps shed rainwater and creates a neat finished appearance.
- Nominal 19mm x 125mm size: Finished size is approximately 14.5mm x 119mm after machining.
- 4.8m length: Long boards help reduce joins across larger cladding runs.
- Suitable for repairs and new builds: Useful for replacing existing shiplap boards or cladding new timber structures.
- Can be cut and fixed with standard tools: Use suitable exterior-grade nails or screws for installation.
Things to check before ordering
- Finished coverage: Allow for the finished board width, overlap, trimming, openings and waste when calculating quantities.
- Board length: These boards are 4.8m long, so check transport, access, handling and storage before ordering.
- Frame support: Cladding needs a suitable frame, battens or fixing structure behind it.
- Ventilation: Install with suitable ventilation behind the cladding so moisture can escape.
- Fixings: Use suitable exterior-grade screws or nails for treated timber and outdoor use.
- Cut ends: Re-treat freshly cut ends where required after cutting.
- Maintenance: Exterior timber cladding will weather over time and may need ongoing maintenance, cleaning or additional treatment depending on exposure.
- Not structural: This is a cladding board, not a structural framing timber.
Complete the job
For fitting shiplap cladding, you may also need suitable exterior-grade screws or nails, battens or framing timber, and suitable sealants or adhesives where the detail requires them.
To compare similar exterior cladding options, view the full Timber Cladding collection, including shiplap, loglap and tongue and groove cladding boards.
