T&G Installation Guidelines


Link to PDFs Installation/Submittals & Cleaning Instructions

NOTE: These instructions are prepared for persons experienced in the field of siding and soffit installation and assume a foundational working knowledge of the tools and application process. Please check with the Authority Having Jurisdiction to verify local building code requirements. It is highly recommended that Longboard® be installed by an experienced professional.

This manual must be read in conjunction with project drawings and specifications, applicable building codes, and relevant compliance documents. The details in this manual provide guidance on how to comply with Longboard®’s installation requirements and need to be reviewed by all parties who are responsible for installing Longboard® products on a project.

Best Practices

Use appropriate PPE (personal protective equipment). The cutting of metal increases the risk of eye injury and hearing loss. USE EYE AND HEARING PROTECTION.

  • Plan your install for best yield/finish appearance.
  • With Longboard® woodgrains, understand the repeating pattern to ensure a satisfactory install.
  • Do not install over pressure treated material without adequate barrier protection.
  • Keep courses straight and level, and in line with adjacent walls. Throughout installation, check the panels’ horizontal alignment every few rows to ensure the siding is installed straight and level on the wall and for panel alignment around corners and above doors and windows.
  • Siding is only as straight and stable as its substrate. In retro-fits: strapping or removal of original cladding or substrate may be necessary. Only install over a flat substrate or a suitable sub-structure.
  • A proper amount of care, as with any prefinished product, will result in a premium quality installation and a lifetime of maintenance free enjoyment.
  • KEEPING IT STRAIGHT AND LEVEL. Keep in mind, siding is only as straight and stable as what lies under it.
  • Throughout installation, check the battens horizontal alignment every few rows to make sure the siding is hanging straight and level on the wall


  • Cut Longboard® using standard wood cutting tools such as a miter saw & table saw with a carbide blade for non-ferrous metals. 60-80 tooth blades are recommended.
  • Cut face up whenever possible: Longboard® is a prefinished material. A reasonable amount of care is critical to obtain the desired results and to prevent marring and scratching.
  • All Longboard® planks are produced a minimum of 1” longer than the specified length, allowing the trimming of taped ends on woodgrain colour installations.
  • Always cut off taped ends as trims will not cover the unfinished ends.
  • Use touch-up pens (light & dark) to paint cut ends of any visible aluminum.
  • Longboard® woodgrains have a repeat pattern every 2’-4’, depending on the species.


Install trims first, hard fastening with the #8 self-drilling corrosion resistant exterior screws (supplied by others) directly through the flange.  Use included quick-screen clips for Starter Strip and Finishing Base or any horizontal trim, to maintain the rear ventilation plain, but still hard fasten for attachment.

Longboard panels are installed using Quick-Screen clips @ 32” on centre (standard requirement), included with every siding or soffit order.  The clips create the rear ventilation plane and allow the installer to “back off” the screw and shim tight to address any substrate discrepancies.  It is good practice to install one hard fastener at the midpoint of each panel, through the flange, to prevent migration of the cladding.

1 Box of 4” V Groove Includes: 135 clips

1 Box of 6” V Groove Includes: 90 Clips

Each 12’ length of Vent Strip Includes: 5 Clips

If less than 32” spacing is required, additional clips can be purchased

Hard fasten any butt-joints (see expansion/contraction)

Snap in any Finishing Cap, Flat Cap and/or U Cap to complete installation


UPON DELIVERY: Check that the delivery is complete, and material has arrived in good condition.  Inspect material before installation, Longboard is not responsible for the installation of damaged or blemished product.

Water-Resistive Barrier

Prior to siding, make sure the water-resistive barrier is properly installed according to the manufacturers’ instructions.

IBC Code Reference: “1403.2 Weather protection.  Exterior walls shall provide the building with a weather resistant exterior wall envelope.  The exterior wall envelope shall include flashing, as described in section 1405.3.  The exterior wall envelope shall be designed and constructed in such a manner as to prevent the accumulation of water within the wall assembly by proviing a water-resistive barrier behind the exterior veneer, as described in section 1404.2, and a means for draining water that enters the assembly to the exterior.  Protection against condensation in the exterior wall assemnly shall be provided in accordance with the International Energy Conservation Code.


1. A weather-resistant exterior wall envelope shall not be required over concrete or masonry walls designed in accordance with chapters 19 and 21, respectively.

2. Compliance with the requirements for a means of drainage, and the requirements of Sections 1404.2 and 1405.3, shall not be required for an exterior wall envelope that has been demonstrated through testing to resist wind-driven rain, including joints, penetrations and intersections with dissimilar materials, in accordance with ASTM E 331 under the following conditions….”


IBC Code Reference: “1405.3 Flashing.  Flashing shall be installed in such a manner so as to prevent moisture from entering the wall or to direct it to the exterior.  Flashing shall be installed at the perimeters of exterior door and window assemblies, penetrations and terminations of exterior wall assemblies, exterior wall intersections with roofs, chimneys, porches, decks, balconies and similar projections and at built-in gutters and similar locations where moisture could enter the wall.  Flashing with projecting flanges shall be installed on both sides and the ends of copings, under sills and continuously above projecting trim.”

Expansion/Contraction Trims

Longboard is aluminum, and will expand and contract 1/4” every 24’ in all directions when exposed to a temperature change of 30 degrees C (54 F)

Lengthwise, each panel MUST terminate into a minimum of one trim

Typical trims used are: Starter Strip, J-Track around windows & doors, Corners, Finishing Cap/Finishing Base at the top of walls & underside of windows and Flat Cap/Base or U Cap/Base for expansion trims in the field

Install Longboard 2 1/2” Perforated Vent Strip where soffit venting is required, as per local code requirements

Longboard perforated vent provides 84 inches of Net Vent Area per 12’ stock length. 21 lineal ft. = 1 sq. ft. of NVA

It is imperative that Longboard panels are cut to fit to the midpoint coverage of trim pieces.  This will allow for both expansion and contraction without bottoming out or contracting out.  Do not fasten Longboard panels and trims together as this will not allow for free movement

Perpendicular to the panels, Longboard siding & Soffit must be broken up using an expansion trim (Finishing Cap/ Finishing Base or Flat Cap/ Base or U Cap/Base) or through-wall flashing at every floor elevation or a maximum of 24’ to accommodate expansion/contraction and floor compression


Staggered butt-joints are acceptable, with only one butt-joint per row between two trims.  Hard fasten each panel through the flange, with a self-tapping screw each side of the butt-joint.  This will keep the butt-joint tight while allowing free movement of expansion/contraction via the Quick-Screen clips and into the pocket of the trims.  Use touch-up pens (light & dark) to paint cut ends of exposed aluminum.