Fungi for fastening the insulation are common facade fasteners, they are used to install insulation to the inner and outer surfaces of the walls of low and multi-story buildings. Before choosing such consumables, you need to familiarize yourself with their varieties, as well as technological features.
Product classification
In order to meet the needs of the modern construction industry, today three varieties of fungi are made for the installation of insulation. Among them are fasteners with a polymer nail, metal, as well as a metal nail with a thermal head.
Plastic dowels, for example, are made of polyamide, nylon or polypropylene. The main advantage of these products is the low price, but their strength leaves much to be desired.
Characteristics of plastic dowels
Plastic fungi for attaching insulation are intended for the installation of thermal insulation on surfaces made of brick or concrete, but they can not be used for working with heavy insulation on hollow walls or foam concrete surfaces. Today, the cost of one such fastener for thermal insulation with a polymer nail is approximately equal to two rubles per piece.
Features of metal fungi
Metal dowels are stronger in comparison with polymer analogues, but their use is limited by a rather impressive thermal conductivity of the metal, which can degrade the efficiency of thermal insulation. Metal fungi for fastening the insulation are able to form cold bridges, which are zones with a fairly high thermal conductivity. A dowel with a metal nail may corrode during operation, and if the installation was carried out on plaster facades, the surface may become covered with yellow spots of rust. You will have to pay about 4 rubles for one such dowel with a metal nail.
Characteristics of fungi with a thermal head
Fungi for fastening insulation, which have a thermal head, are common as an alternative to metal dowels. They are based on a steel nail, but the cap is coated with metal with low thermal conductivity. Impact-resistant polyamide is used as a coating, the thermal conductivity of which is 0.027 W / micron, this parameter can be compared with the similar quality of a large number of popular heaters. Among other things, the metal nail is in the so-called polymer case, which is why the dowel is not exposed to moisture and corrosion. However, you will have to pay more for all these qualities, the price of a product with a thermal head can vary from 4 to 6 rubles. for one piece, the final cost will depend on the manufacturer.
Determination of the length of the fastener
When the insulation is fixed to the wall with fungi, it is important at the first stage to calculate the necessary length of the consumables. In this case, you must be guided by the rule that provides for the use of the formula: D = T + K + I + Z. In it, the value of T is the thickness of the applied insulation, while K is the thickness of the adhesive layer that is used to strengthen the insulation panels. The length by which the dowel will go deep into the wall is indicated by the letter I, this value cannot be less than 4.5 cm. And finally, Z is the value that is used when the wall deviates from the vertical. Use it if necessary.
Quantity determination
If you will use fungi for fixing the insulation, the consumption per 1 square meter should be determined by you. To do this, use building codes. To fix the thermal insulation on the internal walls or facades of one-story buildings per square meter of insulation, it is necessary to use four fasteners, each of which is located in the corner. In this case, you need to add one in the center of the panel. If we are talking about the corners of the building, then 6 fungi will be required, which are installed parallel to each other. To install insulation on facades, the height of which starts from 8 and ends with 20 m, 7 pieces per square meter will be required. If you have to work with the facade of a multi-storey building, the height of which is more than 20 m, then 9 fungi will need to be spent per square meter of thermal insulation.
Length and cost
If you need fungi for attaching a heater, you can buy this consumable in St. Petersburg at different prices. For example, if we are talking about a dowel, the dimensions of which are 10x100 mm, and the nail has a polypropylene coating, then for one unit of goods you will have to pay 2.39 rubles. If the length increases to 160 mm, then the dowel for thermal insulation will cost 5.68 rubles, while he will have a metal nail. Fasteners with nylon nails 120 mm long will cost 3.86 rubles. Fungi for attaching the insulation, the length of which is 120 mm, cost 6.27 rubles. In this case, there is a metal nail and a thermal head.
If you are interested in a variety of fungus that has a metal nail and a thermal head, then the length of the fastener can be equal to 160 mm, the price in this case increases to 7.74 rubles. With the same length, but with a polypropylene nail, the price will be 2.94 rubles. You can buy fungi for attaching a heater in Moscow at the same cost, if the length is increased to 200 mm, and the nail is metal, then 7.79 rubles will have to be paid for 1 unit. If necessary, you can find a metal nail, which looks like a dowel with a length of 220 mm, while the price is 9.82 rubles. Such fungi for attaching the Technonikol insulation are also suitable, you can use them with a length of 140 mm. If the nail is covered with polypropylene protection, then 2.67 rubles will have to be paid for the dowel.
Mounting technology
Whatever insulation material you use, whether it’s polystyrene, polystyrene foam or polystyrene, the technology for installing the material with dowels will be identical. First, the insulation is prepared, then the panels are installed on the adhesive solution, and the next step is fixing with dowels. Do not forget about the need for processing joints, as well as the installation of an insulating film. At the final stage of thermal insulation, it is sheathed with finishing material or plastered. Before installing the insulation, it is important to prepare the surface, remove the plaster and repair unevenness and cracks. In order to improve the adhesive quality of the adhesive, the base of the walls is degreased. Panels of polystyrene foam, polystyrene foam or foam plastic are seated on an adhesive composition that should not contain toluene or acetone, as well as other organic solvents. In order to exclude thermal insulation shift under its own weight, a metal profile should be laid under the first row of plates. Once the solution has dried, additional fixation with fungi can be carried out. For their installation, holes will be required, for the completion of which drills with a diameter equal to the diameter of the fastener foot should be used. While the length of the hole should be greater than the length of the dowel by a centimeter, this will eliminate unreliable fixation if dust has accumulated inside the hole.
Additional recommendations
Fungi should be located at the joints of the panels, as this will not cause an increase in the holes in the insulation, which can adversely affect the effectiveness of the insulation layer. If the fungus needs to be installed in a metal coating, then a self-tapping screw should be fixed to its leg, then with the help of it the fasteners are pressed into thermal insulation so that the self-tapping screw reaches the insulated surface. Then, with the help of a screwdriver, the dowel is screwed into the metal, and the depth of the hole for the self-tapping screw should be approximately 15 mm. After the installation of thermal insulation is completed, the joints formed between the insulation panels must be glued with reinforcing aluminum tape.