The STIFERITE Class SK exterior insulation system can be installed on all building substrates with a good continuity and bearing capacity:
brick walls, blocks, panels or concrete walls, tuff, outdoor wood, etc.
A damage and support resilience inspection must be carried out particularly in restructuring cases and, should this require a recovery, a primer must be laid or the substructure must be roughened.
The STIFERITE Class SK panels can be cut or trimmed with a cutting tool blade (hacksaw rigid blade, circular saws), but cannot be cut by hot wire.
Bead or spot (recommended) round the edges fastening method: Lay the glue around the edges (bead) and two or three gluing points at the centre of the panel,
so that by pressing the insulating plate at the bottom, and respecting the admissible support tolerances, a 40% minimum glue coverage is obtained.
Entire surface method: The glue can be applied to the insulating panel with a notched trowel (with variable teeth according to the evenness of the support). This bonding system is only possible for sufficiently plained supports.
The STIFERITE Class SK panels must be laid in horizontal rows, from the bottom upwards, with half-bond patterns. The heads of the panels must be alternated in the corners.
The panels must be perfectly matched and there should be no gaps greater than 2 mm. Should these be present, they must be sealed with strips of insulating material or filled with single-component polyurethane foam.
After careful installation, the surface of the panels must be leveled. Otherwise, any irregularities of the panels’ surface must be smoothed with abrasive paper. The possible abrasion may remove areas not exceeding 30 cm. The dust produced by the sanding operation must be taken away.
The polyurethane foam on the edges of the panels not protected by the coating tends to turn yellow due to UV rays: the powdery substance produced (yellowish) must be completely removed by sanding and brushing before applying the base-coat.
The STIFERITE Class SK exterior thermal insulation system envisages the fixing with dowels of the panels and may only be carried out after the glue has completely
hardened (at least 48 hours).
The anchors must comply with ETAG 014 requirements. The typology choice should be made by considering the substrate features (gravel, concrete, wood,...), the plaster and possibly the putty and the flatness of the anchoring substructure in order that the fastening is appropriately resistant to tearing. We recommend 60 mm diameter hammer, screw anchors or toggles for STIFERITE Class SK panels. The height, orientation and typical wind strength in the area where the building is located defines the required amount of hardware with an anchor load of 0.2 or 0.15 kN (see Eurocode I).
The most common fastening scheme for STIFERITE Class SK panels dimensions 600 x 1200 mm is the illustrated "T" one, which requires fastening each panel at the corners and in the centre (4,17 fastening points/m2).
The base-coat plaster is applied by hand or machine to the insulating layer in the thicknesses specified by the manufacturer and the stiffened fibre glass
mesh is inserted vertically from top to bottom, with an overlap between the sheets of at least 10 cm whilst avoiding the formation of any folds.
The mesh should be positioned in the centre or in the outer third of the base-coat plaster. The finishing coat is applied with the "wet on wet"
method in order to ensure the necessary coverage of the entire mesh.
The fibreglass mesh must be covered with at least a 1 mm layer of mortar, and of at least 0.5 mm in the mesh overlap areas.
After the base coat plaster is hardened, in accordance with the manufacturer’s instructions, and with the appropriate weather conditions, the finishing coat may be applied; this must be laid over a base-coat where indicated by the system manufacturer's manual.