SPP WEATHERBOARD SYSTEMS

For generations New Zealanders have chosen natural timber weatherboards as their preferred choice for exterior cladding.
With a proven history of well over 150 years, timber weatherboards continue to withstand the rigours of New Zealand’s uniquely changeable climate.

SPP WEATHERBOARD SYSTEMS allow you to create a timeless style, in a cost efficient and environmentally friendly manner. Produced from renewable Radiata Pine that is 100% FSC certified, SPP WEATHERBOARD SYSTEMS offer discerning specifiers, builders, and homeowners an environmentally responsible, and superior finished cladding system which is safe to handle for staff, builders and homeowners alike.

SPP weatherboards are available in a variety of sizes and profiles, and can be adapted to suit any style of home or commercial building. Ease of installation and finishing make SPP weatherboards not only stylish and durable, but also very cost efficient.
Building or renovating? Trust you are making the right choice for your next building project with SPP WEATHERBOARD SYSTEMS:

  • Environmentally Friendly
  • Cost Efficient
  • Durable
  • Easy to Install & Quick to Finish
  • Energy Efficient
  • Made in New Zealand
  • Timeless Style
  • Superior Finish

SPP Weatherboard Systems

SPP weatherboards and treated products, manufactured by Southern Pine Products (SPP) make a complete weatherboard system produced from kiln dried Radiata Pine. The SPP WEATHERBOARD SYSTEM offers builders and homeowners substantial savings in both time and money whilst better protecting our environment. SPP weatherboards are primarily delivered to site treated (H3.1 LOSP) and coated with a machine applied Alkyd (oil based) primer. Simply finish pre-primed product on site with two coats of 100% premium acrylic house paint to achieve a great look and long lasting finish.

General Information

SPP weatherboards and components are produced from kiln dried New Zealand Radiata Pine and have been treated to H3.1 standard. Pre-primed weatherboards and components have also been coated with a machine applied alkyd primer in a controlled factory environment.
Profile Choice: Careful consideration during the design process should be given to the choice of profile, the size of the board and the subsequent surface coating in relation to the prevailing weather and exposure conditions at the site. SPP weatherboards and components have been manufactured in accordance with NZ3617 standard.
Grade Options: SPP weatherboards are primarily pre-primed finger-jointed Radiata in uniform lengths (normally 6.1m), but can also be adapted to other grades including clears, number two clears and dressing grade. Pine clears, number two clears, and dressing grade options are available in both dressed and band-sawn finishes, and are supplied in a random spread of lengths, either pre-primed or natural.

Finger Jointed

Short lengths of clear Radiata glued and then jointed to form a uniform length, normally 6.1m. Available pre-primed this grade is suitable for paint finish only.

Clears

Whilst some minor defects are permissible in this grade, as the name suggests it is essentially clear four sides.

No.2 Clears

This grade is primarily clear on the face and edges and allows defects such as knots and other minor blemishes on the back face. An occasional defect may occur on the face and should be docked prior to application.

Dressing Grade

Dressing Grade is an appearance grade, with sound tight knots and other natural defects as per N.Z grading (NZS 3631: 1998)
Dressing Grade allows for and may include defects such as:-

  • Tight Knots
  • Resin Stains
  • Tannin staining
  • Intergrown knots
  • Bark encased knots

Prior sorting of the boards and some docking/cross cutting will be required to remove defects that do not meet the requirements of the N.Z building code. The above is a result of Dressing Grade allowing for the inclusion of numerous smaller knots, therefore having an increased likelihood of resin bleed, as well as shrinkage and cracking of the knots.
Dressing Grade weatherboards offers a low cost alternative to Clears and Finger joint; however consumers should be aware that more maintenance of both the weatherboard and its surface coating may be required. Southern Pine Products Ltd takes every care in processing this product and it is likely your Dressing Grade weatherboards are at the higher end of the grade and will include a good percentage of No.2 Clears.

Treatment H3.1/ H3.2

Radiata weatherboards are generally LOSP treated to H3.1 standard and require a minimum four coat premium quality paint system to meet building code requirements. If the end user intends to use a stain finish, then the weatherboard must be CCA treated to H3.2 standard.

Dimensional Change

Timber is hygroscopic (absorbs moisture from the atmosphere) and will take up and release moisture until it reaches an equilibrium moisture content with the surrounding environment. During this process, which is ongoing, the timber expands and contracts and thus some dimensional changes will occur, this will be minimised by the application of a quality paint system.

Resin Bleed and Tannin Staining

Resin bleed and tannin staining are natural features of timber weatherboards, which may sometimes occur. Whilst unsightly this occurrence does not affect the durability or long-term performance of the weatherboard. Selecting a light coloured top coat and a correctly applied premium quality paint system, which includes an oil based undercoat and premium acrylic top coats with tannin blockers, will help minimise both dimensional movement and surface degradation such as resin bleed and tannin stain.

Handling

SPP weatherboards and components should be unloaded by hand, or with a hiab or forklift. Do not tip SPP products from a truck. Avoid scratching the face of the board, and always carry individual boards with their long sections upright to avoid excessive bending.

Storage

SPP weatherboards and components must remain dry at all times prior to installation. SPP Weatherboards and components should be stored indoors on a flat surface off the ground, on bearers at 900mm centres, and at least 150mm of the ground, out of direct sunlight and protected from both rain and ground moisture uptake. If storing outside use a secondary waterproof cover whilst allowing for a good air circulation.

Surface Coatings

The primary reasons for applying surface coatings to weatherboards and components are:-

  • Preventing excessive movement
  • Protection against moisture uptake and surface degradation
  • Appearance

A quality four coat paint system provides the most effective timber surface protection. Semi-transparent stains and acrylic clear finishes have become more popular in recent years, but do not offer the same surface protection and may require more maintenance over time.

Finishing and Painting (SPP Pre-Primed Two Coat Weatherboards)

  • Painting should take place a soon as possible after installation. If boards have been exposed for longer than six weeks, some sanding and re-priming may be required.
  • Check the moisture content of the boards before painting. Equilibrium Moisture Content (EMC) should be at 16% or less. Use a correctly calibrated moisture metre to check.
  • Once installed, remove all loose material such as dirt from the surface. Spot prime any exposed timber with two coats of acrylic primer. Punch nails, putty over and spot prime immediately. Any sealants used should be of a flexible exterior grade and suitable for over cutting with acrylic paint.
  • Once prepared, simply apply two coats of 100% premium acrylic house paint to the manufacturer’s specification, at a rate of 12-14m2 per litre.
  • Once applied the two top coats should have a combined thickness of no less than 50 microns.
  • The onus is on the painter to ensure that the primed surface remains well adhered to the timber substrate and is a suitable base for the subsequent top coats, particularly where the boards have been exposed for longer than six weeks before top coating.
  • Painters should refer to the AS/NZ 2311 guide to painting buildings.
  • We recommend galvanised jolt head nails for fixing SPP weatherboards and components. It is assumed the nails will be punched, puttied over and painted.

Finishing and Painting (SPP Pre-Primed One Coat Weatherboards)

  • Painting should take place a soon as possible after installation. If boards have been exposed for longer than six weeks, some sanding and re-priming may be required.
  • Check the moisture content of the boards before painting. Equilibrium Moisture Content (EMC) should be at 16% or less. Use a correctly calibrated moisture metre to check.
  • Once installed, remove all loose material such as dirt from the surface. Spot prime any exposed timber with two coats of acrylic primer. Punch nails, putty over and spot prime immediately. Any sealants used should be of a flexible exterior grade and suitable for over cutting with acrylic paint.
  • Apply one full coat of oil based undercoat.
  • Once undercoated, simply apply two coats of 100% premium acrylic house paint to the manufacturer’s specification, at a rate of 12-14m2 per litre.
  • Once applied the two top coats should have a combined thickness of no less than 50 microns.
  • The onus is on the painter to ensure that the primed surface remains well adhered to the timber substrate and is a suitable base for the subsequent top coats, particularly where the boards have been exposed for longer than six weeks before top coating.
  • Painters should refer to the AS/NZ 2311 guide to painting buildings.
  • We recommend galvanised jolt head nails for fixing SPP weatherboards and components. It is assumed the nails will be punched, puttied over and painted.

Staining

*Note: Weatherboards must be CCA treated to H3.2 standards if being stained.

  • Prior to installation apply one full coat of your chosen stain to all four sides of the product. Seal all cut ends with the stain.
  • After installation apply an additional 1-2 coats on the face and bottom edge. Read the stain manufactures instructions prior to starting.

Colour Choice

  • Dark colours absorb heat from the sun and may cause excessive movement, distortion and possibly resin bleed. Light colours reflect the suns heat. SPP weatherboards and components must be painted in light colours only with a light reflective value (LRV) of greater than or equal to 45%. Refer paint colour charts for details.

Installation

SPP weatherboards and components should be installed as per the current building code and BRANZ recommended good building practices. Some helpful hints are listed below:

  • Ensure a quality building wrap is installed in accordance with the manufacturer’s specifications. When installing the wrap, pay particular attention to the openings for doors and windows, internal and external corners and any other intrusions through the wrap such as metre boxes.
  • Flashings of approximately 75mm each way should be installed over the wrap on external and internal corners, prior to installation.
  • Seal all cut ends with two coats of acrylic primer.
  • Single nail all weatherboard profiles, regardless of size. Nailing boards together will likely result in split boards.
  • Never nail through laps. Nails should be fixed approximately 10mm above the rebate or for bevelback approximately 10mm above the board below.
  • Refer to nail chart for correct nail type and size.
  • Leave a 2mm gap between rebated profiles (such as rusticated or shiplap) to allow for expansion and contraction.
  • Ensure non-rebated profiles such as bevelback have a minimum lap of 32mm.
  • Angle mitre joints away from the prevailing wind at the site and/ or use flat soakers.
  • Ensure weatherboards, once installed, are at least 150mm from the ground and 100mm from decks and terraces.
  • Timber facings combined with scriber or plugs not only look good but offer additional protection against the weather.

Nail Sizes For Timber Cladding

Profile Direct Fix Over Cavity
Bevelback 75×3.15 JH 90×4.0 JH
Rebated Bevelback 60×2.80 JH 75×3.15 JH
Scallop Rusticated 60×2.80 JH 75×3.15 JH
Vertical Shiplap 60×2.80 JH

*Nail length can be reduced to the ‘direct fix’ size if the cavity batten is deemed to have been structurally fixed to the stud.

Maintenance

Gently wash the exterior of your home once a year to remove surface contaminants such as marine salts etc. Do not use a water blaster. Pay particular attention to areas under eaves or where the boards are not regularly washed by the rain. Re-painting times of seven to ten years will vary depending on the type and quality of the topcoats, chosen surface colour, and climatic conditions the weatherboards and components are exposed to.

This information is supplied in good faith, and we recommend the installer and painters familiarise themselves with all relevant building and painting codes. Builders using weatherboards should purchase the BRANZ Good Practice Guide for Timber Cladding, a comprehensive detailing and installation guide.
Southern Pine Products Ltd will not be liable for any losses incurred from the failure to adhere to good building and painting practices.
Although every effort has been made to ensure the information provided complies with existing standards and recognised codes of practice, no responsibility is accepted for any errors and omissions nor for any specifications or work based on this information.

MOULDING PROFILES GALLERY