Aluminum and galvanized profiles are used in rivet system. The rivet points of the panels and the carrier profiles are drilled 8mm in diameter (sliding point). They are mounted to the system with rivets of 4.8mm diameter. The head diameter of the rivets should be 14-16 mm. Certain points of the panels are drilled to the same size (4.8mm) as the rivet diameter (fixing point). The color of the rivets can be the same as the color of the aluminum or the color of the panel. Screwing is the most common system for fixing Viroc panels in terms of efficiency and ease of application. The substructure can be metal or wood. Due to the similarity of performance of the materials, it is more convenient to use wood substructure. In outdoor applications, the relative humidity difference in the air and the exposure of the panels to the sun causes a size difference in the boards. Therefore, the use of a screw with a head greater than the diameter of the drill hole in the plate is recommended because it allows expansion and contraction to occur without creating any tension.Screws to be used on exterior facades should be stainless steel.

Viroc panels with a maximum thickness of 10mm can be fixed to a metal or wood substructure with adhesive fixing system. The adhesive system generally consists of an adhesive (polyurethane, MS Polymer or hybrid paste), a double-sided adhesive tape, and a primer set to be applied to the substructure. It is not recommended to use the adhesive system outdoors. In countries with special fire regulations, this system is not allowed, as adhesives such as polyurethane, MS polymer etc. do not have fire resistance.

FIXING SYSTEM WITH RIVET OR SCREW

FIXING SYSTEM WITH ADHESIVE

Viroc cement particle boards can be fixed by either mechanical screw-fix or adhesive. The structure supporting the Viroc boards must be aligned and levelled to ensure the board does not warp. The sub-structure used is either treated dry pine beams or metallic profiles made from galvanised steel or aluminium. Whilst the screw-fix approach is the most common method of fixing due to ease and efficiency, Viroc boards can also be bonded onto a metal or

wooden sub-structure using a polyurethane, MS polymer or hybrid mastic adhesive. Nailing is another method of fixing the board to the substrate, and can only be used with wooden structures – ideally indoor.

VIROC BOARDS - INSTALLATION

GENERAL GUIDELINES ON VIROC BOARD PREPARATION

Cutting Viroc boards are easy to fabricate, just like wood. For thicknesses up to 19mm, circular saws are ideal and for greater thicknesses, the support of a workbench is recommended to support safety requirements as well as ensuring even surface quality. A jigsaw is ideal for curved cuts (using the correct blade depending on wood or metal). Drilling A conventional hammer drill is ideal for drilling into the Viroc board, using drill components suitable for drilling metal. Sanding Viroc board can be pre-fabricated with a sanded finish. When the board is sanded, wood particles become visible on the board surface, enhancing the board’s natural appeal. The thickness tolerance of the sanded board is ± 0.3 mm.

Machining of edges Using a router, the edges of the panel can be machined to form bevel, tongue-groove or half lap joints. The tooling pieces should be tungsten carbide. Varnish The Viroc panel can be varnished to improve protection against UV and rain. Continuous and steady application is recommended to support a uniform finish. Solvent based acrylic varnishes are ideal for application. Painting The Viroc panel can be painted for decorative purposes with a large variety of paints or coatings. A paint finish can contribute to the protection and longevity of the panel, as well as add aesthetic dimension to the overall build.