With the onset of cold weather, every car owner faces the need to keep the heat in the garage. Quality. wall-insulation allows not only to create comfortable conditions for repair, but also to prevent the formation of condensation, which is destructive for the body of the car. Ignoring this stage leads to dampness, mold and corrosion of metal elements of the structure, as well as the car itself.
In this article, we will analyze proven thermal insulation technologies that can be implemented independently without the involvement of professional teams. You will learn about the characteristics of various materials, installation features depending on the type of walls and critical nuances of ventilation. Correctly executed heat-insulation It is an investment in the durability of your property.
Before purchasing materials, it is necessary to audit the current condition of the walls and determine the purpose of the premises. Will you heat your garage in winter or just want to minimize the temperature? The answers to these questions directly affect the choice of technology and thickness.
Selection of suitable thermal insulation material
The construction materials market offers a wide range of solutions, each with its own advantages and disadvantages. The most popular option remains polystyreneIt is valued for its low hygroscopicity and ease of installation. Styrofoam sheets are easily cut with a regular knife, do not require special fasteners and perfectly keep warm even at high humidity.
However, it should be borne in mind that this material belongs to the class of combustibles, which requires additional protection. For garages, the brands PSB-S-25 or PSB-S-35 are often used, where the letter "C" indicates the presence of flame retardants that slow down combustion.
The alternative is mineral-wool and basalt-plate. These materials have excellent fire resistance and sound insulation, but require careful waterproofing. If the wool gets wet, it will lose its thermal insulating properties and can become a source of moisture for the metal.
The modern solution is to be sprayed polyurethane. It creates a monolithic layer without seams, which eliminates cold bridges, but requires special equipment for application. For most motorists, rigid polymer-based plates remain the optimal balance of price and quality.
Surface preparation and material calculation
Before starting the work, the basis must be carefully prepared. Walls should be cleaned of dust, dirt, oil stains and peeling plaster. If you work with brickwork, all cracks should be sealed with cement mortar or mounting foam to prevent blowing.
Pay special attention to the elimination of fungus and mold, if they already exist. The surface is treated with antiseptic deep penetration primers. Ignoring this stage will lead to the fact that under the insulation will continue destructive processes.
⚠️ Warning: Never install a heater on wet walls. Residual moisture, once in a closed space, will inevitably lead to the formation of condensation and corrosion of valves or metal profiles.
To calculate the amount of material, measure the perimeter of the garage and the height of the walls. From the obtained area, subtract the area of the gates and window openings. It is recommended to add 5-10% of the margin for trimming and possible errors during installation, especially if the walls have complex geometry.
☑️ Checklist for wall preparation
If the walls of the garage are made of metal, the preparation includes cleaning from rust and coating with anticorrosion composition. Metal structures are subject to thermal expansion, so fasteners must have a margin of safety.
Technology of installation of insulation on different types of walls
The method of fastening directly depends on the material from which the garage is built. For brick and concrete walls, the combined method is most effective: gluing plates to a special glue foam with additional fixation with dowels-umbrellas. This ensures tight fit and no air pockets.
In the case of metal garages ("shells"), the frame method is often used. On the walls is mounted crate of wooden timber or metal profile, in the cells of which the insulation is inserted. This approach allows you to level the surface and create a ventilation gap.
| Type of wall | Recommended material | Method of attachment | Need for crate |
|---|---|---|---|
| Brick/Concrete | Foam, EPPs | Glue + dowels | Not necessarily. |
| Metal | Minwata, Penofol | On the frame. | Required. |
| foamblock | Foam, PPU | Glue/Spealing | If you wish, |
| Tree. | Minwata, Ecovata | Between the bars | Yeah (as part of the wall) |
When using frame technology, the strut step should correspond to the width of the insulation. If you use soft mats, they need to be inserted into the spores so that they are tightly held between the profiles without additional attachments.
Use a tolule-free mounting foam to stick the foam. Normal foam when drying expands and can deform plates, disrupting the geometry of the layer.
Vapour insulation and ventilation
One of the main mistakes in warming is to ignore the vapor insulation layer. In the cold season, the warm air from inside the garage tends to the outside, passing through the walls. When in contact with a cold insulation, moisture condenses, turning into water.
Special membranes must be used to protect thermal insulation. If you insulate the walls with mineral wool, the vapor insulation film is mounted on the warm side (inside the room). For foam, this stage is less critical, but desirable for creating a sealed circuit.
Ventilation is the heart of a healthy garage. Even with perfectly executed insulation, it is necessary to ensure the inflow and extraction of air. Natural ventilation is organized through the winds at the bottom of the walls and the exhaust pipe under the ceiling.
What is the dew point and why is it important?
The dew point is the temperature at which water vapor turns into a liquid. When insulating, it is important to move the dew point into the body of the insulator or outward so that condensation does not form on the inner surface of the wall or on the body of the car.
A forced system using channel fans is more efficient, but requires energy. The minimum air exchange should be about 150-180 cubic meters per hour for a standard single-bed garage.
Finishing and protection of the insulation
The insulation, especially polymeric, should not be left open. It is easily damaged mechanically and, more importantly, requires fire protection. For interior decoration of the garage, fire-resistant drywall (GKLO), flooring or trimming are most often used.
If you choose drywall, the joints of the sheets are clasped, and the surface can be painted or pasted with wallpaper. This gives the garage the look of a living room. A professional is more practical for the “working” zone, since it is difficult to damage it with a tool when repairing a car.
Fire resistance The finish is priority number one. All wooden elements of the frame should be treated with flame-protective impregnation. In the garage, flammable liquids are stored, so the risk of fire is always higher than in the house.
⚠️ Warning: Do not use flammable materials such as conventional foam without a protective layer or low-quality cheap PVC panels for interior decoration of the garage.
Frequent errors and ways to fix them
Many beginners make mistakes that negate all efforts to insulate. The most common of them is the lack of sealing of joints. Even small gaps between the plates create bridges of cold through which heat escapes.
Another mistake is the use of inappropriate adhesives. Some mixtures contain solvents that corrode polystyrene foam. Always check the compatibility of the materials before starting the work.
- ❌ The lack of waterproofing of the foundation, which leads to the rise of moisture on the walls (capillary effect).
- ❌ The use of metal fasteners without thermal washers, creating freezing points.
- ❌ Ignoring the insulation of the gate and ceiling, through which up to 60% of the heat goes.
If you notice mold in the corners after insulation, the technology of vapor insulation is probably broken or ventilation is not working enough. In this case, it may be necessary to dismantle part of the finish for drying and installing additional ventilation channels.
The quality of insulation depends not so much on the thickness of the material, as on the absence of gaps and proper operation of the ventilation system.
FAQ: Frequently Asked Questions
Can I keep the garage open from the inside or just from the outside?
Insulation can be done both ways, but interior insulation is more popular for garages because of the ease of execution. However, with internal insulation, it is critically important to correctly calculate the dew point so that the wall does not freeze and damp. External insulation is more effective, but more difficult to implement, especially if the garages are close to each other.
What is the optimal thickness of the insulation for the middle strip?
For the central regions of Russia, the optimal thickness for foam or mineral wool is considered to be 100 mm. This value can vary depending on the material of the walls: more may be required for brick, less for foam block. The exact calculation depends on the thermal conductivity coefficient of a particular material.
Do I need to insulate the floor in the garage?
Insulation of the floor is desirable if the garage is heated or under it is a basement. If the garage is on a concrete slab directly on the ground, floor insulation will prevent freezing and dampness. Extruded high-density polystyrene foam or ceramzytoconcrete screed is used.
What about electrical wiring when insulating?
All the wiring is better to translate into an open corrugated pipe (cable channel) and lay on top of the layer of the insulation, but under the finishing finish. It is not recommended to slap the insulation, as it violates its integrity. All connections must be in available distribution boxes.