Specifications items low thickness thermal insulation
Laying of basalt wool fiber thermal and acoustic insulation Nobilium thermalpanel, for exterior/interior facades characterized by the use of mineral mortars. The system offers great resistance to the formation of cracks and micro-cracks in fact the tensile strength is 1478 Kpa, according to Uni EN 1606, and having a resistance to vapor diffusion equal to μ= 3, it counteracts the formation in the facade of microorganisms, algae and fungi. The insulation panel is classified, according to UNI EN ISO 1182, in Euroclass A1 fire reaction, therefore complying with the minimum requirements set out in the 2013 VVF guidelines for "simple facades." The insulation system must be made on a clean, load-bearing, dry and flat substrate. The panel shall have the following technical characteristics: density 180 Kg/m³, the thermal conductivity λD equal to 0.032 W/(m-K), specific heat at 2100 J/KgK marked in accordance with EU 305/2011 dated March 9 with PDO from notified institute No. 2685. Provision shall be made for the bonding of the insulation slabs, according to the chosen system of adhesion dictated by the laying cycles of the indicated mineral mortar manufacturers.
Lay the slabs with juxtaposed and staggered joints, including on the edges. Before proceeding with the application of the insulating slabs, the work of preparing the substrate must be completed in a workmanlike manner, consisting of the complete removal of paint, varnish and/or plastic coatings, to be carried out by scraping and/or pressure hydro-washing, until the load-bearing structure is brought to the surface. Then the remediation, rehabilitation and cortical resurfacing of the deteriorated parts should be carried out, any changes in flatness to a tolerance of ± 5 mm. The installation of thermal facade insulation, involves the total adoption and application of a "system" complete with all accessory components and applied according to the operating methods and codes of practice established by the manufacturer. All materials and components adopted (primer coat, adhesive mortar, insulating element, skimming mortar, reinforcing mesh, finishing coat, accessories, etc.) must be part of the same system, compliant and certified.
Preparation of the substrate layer: Adequate preparation of the substrate is reflected in an increase in the ease of installation of the system, resulting in advantages of site organization and better final execution.
- Inspection to assess the type and condition of the substrate and in particular the moisture content of the substrate, the risk of rising water, and the identification of cracks in the substrate.
- Rubbing test performed with the palm of the hand and/or a dark cloth to determine the absence of dust, harmful efflorescence, or existing friable coatings.
- Abrasion or scuff test with a sharp hard object to determine the strength and load-bearing capacity of the substrate. Wetting test with a brush and/or sprayer to determine the absorption and moisture content of the substrate.
- On-site assessment of substrate moisture (visual analysis).
- Checking for flatness, if national tolerances are exceeded in the building, it is necessary to apply suitable compensatory measures by making a load-bearing substrate suitable for bonding.
Gluing and fixing the insulation board: When preparing the adhesive, the manufacturer's instructions (directions on the product packaging, data sheets, safety data sheets) should be carefully followed. Glue application can be done manually or by machine. While by full-surface bonding, the adhesive mortar layer is spread over the entire surface of the insulation panel by means of a notched trowel. It is advisable to remove the adhesive from the edges of the panel for a distance of about 2 cm to avoid the flow of the mortar itself into the panel joints and the consequent formation of small but significant local thermal bridges. Extended bonding is particularly suitable when working on substrates that have good flatness.
A method for determining the adhesion between a plaster mortar and the substrate is defined in EN 1015-12. It is "determined as the maximum tensile stress by direct load perpendicular to the surface of the plaster mortar applied to support. https://www.linkedin.com/pulse/come-assicuro-il-pannello-isolante-fissato-al-supporto-marco-gamba/
Reinforced skim coat; Reinforced skim coat, also called base (or foundation) plaster, is basically composed of two elements: the skimming mortar and the reinforcing mesh. Different types of base plaster can be used ( see certified companies) depending on the requirements of the system and the material. A distinction is made between thin, medium and thick base plaster. The skimming mortar is applied with a smooth steel trowel to a uniform thickness of about 3 mm, following the instructions provided by the system manufacturer. After the formation of the first layer (homogeneous and uniform) of skim mortar, the reinforcing mesh will be laid, which is drowned by the application of subsequent layers of skim mortar. The reinforcement, which is drowned in the skim coat, generally consists of a 150kg/sqm square-mesh fiberglass mesh.
At the corners of doors and windows it is necessary to insert diagonal reinforcing nets, which should be applied in the base plaster before the application of the reinforced skim coat, and fixed, so that the edges of the strips are directly on the corner with an inclination of about 45 °.
Finishing plaster: The implementation of the finishing layer is the final stage of the work, also helps to make the system resistant to weathering and pleasing in appearance (color, gloss). Before laying the final coating it may be necessary, if expressly required by the way the system is made, to apply a layer of primer paint or varnish (primer) whose essential function is to ensure adequate adhesion of the finishing coating to the thin layer of reinforced skim coat. Usually if primer and finish plaster have the same binder base (synthetic resin or lime-cement mineral binders), it is not necessary to use the primer. The primer products are applied in the traditional way using tools such as brush and roller or by spray application. For the creation of the finishing layer, trowel application is usually used due to its better ability to eliminate and compensate for any unevenness defects in the smoothing layer
