Vertical Shiplap

Clelands Timber Products have over a 100 years’ experience in the timber industry and produce a CodeMark approved Complete Weatherboard System.

With a range of finishes, sizes, timber treatments and pre-primed options produced from sustainably sourced NZ Radiata Pine, you can rest assured we’ll stand by our products for another 100 years.

Options Available

Profile Nominal size Finished size Length Grade Treatment Finish Profile
Vertical – WS 200 x 25mm 180 x 18mm 6.3m Finger Jointed H3.1 Pre Primed or Dual Coat
Vertical – WS 150 x 25mm 135 x 18mm 6.3m Finger Jointed H3.1 Pre Primed or Dual Coat

Why choose this product?

Code Mark

Audited tried and tested product


25 year warranty. Transferable to new owners

NZ Made

Responsibly sourced NZ product


Number one choice for NZ's for over 100 years


Treated to prevent deterioration

Easy to Specify

Comprehensive technical drawings for architects and specifiers


Design specifically for NZ's weather and standards


Made by our experience team and subject to our stringent quality checks


Attractive and durable solution for exterior home cladding

Finish Options

Single Coat

Our primer is a machine coated alkyd oil based primer designed as an adhesion coat for the next coat of paint. This primer does not waterproof the timber but does slow water uptake.

Radiata Pine contains tannin which can cause paint to turn brown. Our primer blocks the migration of the tannin into the paint coating minimising the discolouration of the painted surface.

Dual Coat

Applying a second coat of oil based primer gives additional durability particularly during the construction stage and reduces water uptake.

Not only does this improve the long term performance of the top coat, it reduces painters time on site, many have estimated the saving at approximately 25% cheaper than on site painting.

Treatment Types


LOSP H3.1 is an effective preservative designed to provide lasting protection for wood products used in external situations above ground protecting against decay and insects. The timber is treated in finished form which improves its dimensional stability.

This LOSP product comes with a 25 year guarantee against fungal decay and insect attack and is water repellent to reduce general uptake of moisture.

For more detailed information about this process refer to

Grades Available

Finger Jointed

Finger jointing results in much higher quality and stronger pieces and components, while dramatically reducing waste. The two most important advantages of finger jointed lumber are straightness and dimensional stability.