Red-marked surface inward
One surface of each slab is marked with red spots or red line and this should always face inside. This ensures the optimum base for rendering. When using two layers of slabs, this applies primarily to the outer slab.
Install insulation carefully
Install the slabs tightly against the base by avoiding the creation of continuous air channels between the wall and insulation. Stagger the joints of the slabs. Avoid using small pieces of insulation because it can lead to defective joints.
Fastening of thin rendering insulation
PAROC® lamellas mainly fastened to the wall with glue. Lamellas are placed with cut surface to the wall. PAROC® slabs are fastened to the wall with both adhesive and mechanical fasteners. Cover the entire perimeter of slabs with adhesive and with spots in the middle of the surface (see drawing). The method and number of fasteners depend on the type the wall, wind loads, and building height. Follow the instructions of the system owner– each system owner has their own fasteners and glues specially designed and tested for certain applications.
Fastening of thick rendering insulation
Install PAROC® rendering slabs with mechanical fasteners. The method and number of fasteners depend on the type the wall, wind loads, and building height. Follow the instructions of the system owner– each system owner has their own fasteners and glues specially designed and tested for certain applications.
Quality of surface
The insulation surface must be dust free and clear to ensure proper adherence between the insulation and the rendering layers. This must be taken into consideration when storing and transporting the insulation before installation. Also mind the edges of the slabs and lamellas.
Avoid prolonged exposure to weather conditions
In rendering applications, do not leave the insulation surface unfinished or uncovered for an extended period. Prolonged exposure to weather ages the surface of the rendering insulation, causing a poor bond for rendering mortar. If ageing occurs, brush away the “dead” insulation surface (1–2 mm) to reveal healthy fibres.
Protect insulation from heavy rain. PAROC® stone wool is rain-resistant, but we recommend covering the insulation material during installation, particularly during times of heavy rain.
Wet insulation in the structure
Stone wool is vapour permeable and moisture repellent. If the surface of a product gets wet after it has been installed in the structure, it usually dries quickly without any permanent damage to the thermal properties of the product. Installation that has become slightly wet on its unmarked external side (the side without red marks) can be installed as it will be able to ventilate and dry. Replace any installation that has become wet on both sides.
To ensure the proper functioning of the insulation prior to installation, store the packages so that they do not get damaged, wet or dirty.