The issue of the tightness of the garage box rises before every car owner, especially if the structure is a classic box of concrete slabs. A leaky roof is not just wet walls, it is corrosion of the body, spoiled tools and constant dampness that destroys the foundation. That's why the choice is, How to cover the roof of the garage of concrete slabsThis is a critical stage of major repairs or construction.
The modern construction market offers many solutions, from time-tested bitumen shingles to modern sprayed polymers. However, not every material is suitable for a flat or low-sloping surface of reinforced concrete flooring. It is necessary to take into account not only the cost, but also the weight of the structure, the complexity of installation and the service life of the coating in an aggressive external environment.
In this article, we will discuss in detail the main types of coatings, their advantages and disadvantages, as well as laying technologies that will allow you to forget about leaks for many years. Well-chosen waterproofing It will be a reliable shield for your property.
Base analysis and surface preparation
Before purchasing materials, it is necessary to conduct a thorough audit of the current state of the floor plates. Concrete is a porous material and prone to microcracks through which moisture can penetrate inside, even if the top layer appears whole. The basis for any roofing cake is a quality screedwhich forms the necessary slope for the flow of water.
If deep cracks or potholes are observed on the surface, they must be sealed with repair compounds based on cement or epoxy resins. Ignoring this stage will lead to the fact that any, even the most expensive coating, will soon deform and lose its tightness. It is important to ensure a height difference of at least 2 cm per linear meter for effective drainage.
Particular attention should be paid to the joints between the plates. These are the most vulnerable places of the structure, where leaks most often occur. They are sewn, cleaned of dust and filled with waterproofing mastics or special sealing cords. Only after the complete drying of the preparatory layer, you can start choosing the finishing coating.
⚠️ Warning: Never place a soft roof on a wet base. The remaining moisture when heated will turn into steam, which will lift the coating and lead to the formation of bubbles.
Traditional bitumen-polymer materials
The most common answer to the question of how to cover the roof, remains roll roof on the basis of bitumen. Modern modifications, such as Technonicol, linocrosm or bicrosthThey significantly surpassed the Soviet ruberoid in durability and elasticity. They are based on glass canvas or polyester, impregnated with modified bitumen, which makes the material resistant to temperature changes.
Installation of such materials is carried out by fusing using a gas burner or gluing to a bitumen mastic. For garage roofs, a two-layer system is most often used: the lower layer serves as waterproofing, and the upper one, with a protective sprinkle of slate or granulate, protects against ultraviolet light and mechanical damage. This is a budget option, which, when properly laid, lasts up to 15 years.
However, bitumen materials have their own characteristics. They require a perfectly flat base and careful preparation. At low temperatures, bitumen becomes fragile, so it is recommended to carry out work in the warm season. In addition, open fire during installation requires strict compliance with fire safety rules.
Secrets of the durability of bitumen roofing
To increase the service life of the bitumen roof, it is recommended to conduct a surface inspection every 3-5 years. Places with thinned sprinkle can be treated with bitumen mastic and sprinkled with quartz sand. This will restore protection from ultraviolet light and prevent bitumen from drying out.
Flooring and metal roofing for the garage
If you are looking for an option that will last for decades without much care, it is worth paying attention to the following: flooring. Metal sheets with polymer coating are great for floors made of concrete slabs, especially if you want to create an additional slope or insulate the roof. The profile is characterized by high strength, fire safety and a variety of color solutions.
Installation of a metal profile on a flat roof of the garage has its nuances. Since the sheets do not have absolute tightness at the joints, a layer of steam and waterproofing is necessarily laid under them. The sheets are attached to a pre-mounted crate or directly to the lags installed on top of the plates. It is important to use special screws with EPDM seals that prevent moisture from entering the holes.
The advantage of metal is the speed of installation and the ability to lay at any time of the year. However, it is worth considering that a metal roof requires a high-quality noiseproofingOtherwise, the sound of rain will be heard inside the garage. It is also necessary to monitor the integrity of the polymer layer: any scratches during installation should be painted immediately to avoid corrosion.
- 🏗️ High mechanical strength - can withstand the weight of snow and human walking.
- 🔥 Fire safety – metal does not burn and does not support combustion.
- 🎨 Aesthetic appearance – a wide selection of colors and wave profiles.
- ❄️ Installation at any time of the year - does not depend on air temperature and humidity.
Comparative cost and service life analysis
The choice of material often comes down to budget, however, savings during the purchase phase can lead to double the cost in a few years. To understand the more profitable it is to cover the roof in the long term, it is necessary to compare not only the price per square meter, but also the cost of installation, as well as the estimated life.
The table below shows the averages for popular materials. It is worth considering that prices can vary depending on the region, manufacturer and thickness of the material. More expensive options often pay off at the expense of not having to repair annually.
| Materials | Duration of service (years) | Difficulty of installation | Approximate cost (ruble/m2) |
|---|---|---|---|
| Ruberoid (economy) | 3-5 | Low. | 150-300 |
| Bicrost/Technoelast | 10-15 | Medium | 400-900 |
| Flooring (with insulation) | 20-40 | Tall. | 1200-2500 |
| Liquid rubber | 15-20 | Medium | 600-1000 |
As you can see from the data, roll-stock It is the most affordable solution, but requires more frequent updates. Metal roofing and modern membranes cost more at the start, but provide reliability for decades. The choice depends on your financial ability and willingness to engage in roof maintenance in the future.
The cheapest material is not always the most economical in terms of year of service. Consider the cost of the work and the frequency of repairs.
Innovative methods: liquid rubber and membranes
Modern technologies offer an alternative to traditional rolled materials - sprayed waterproofing or rubber. This method allows you to create a seamless monolithic coating that perfectly repeats all the irregularities of the base and seals even hard-to-reach places around the ventilation pipes.
The basis of such materials is a bitumen-polymer emulsion, which is applied by cold spraying or brush. After drying, an elastic film is formed, resembling rubber, which does not crack in the cold and does not flow in the heat. It is an excellent solution for roofs of complex configuration where the use of rolls is difficult.
Another modern option. PVC or TPO membranes. They are mechanically mounted or loaded with ballast. Membranes have high vapor permeability, which allows you to remove moisture from the structure, and are resistant to punctures. Although the cost of such materials is higher, their resource often exceeds 30 years.
☑️ Preparation for liquid rubber
Technology of laying and important nuances
The quality of the roof is 80% dependent on compliance with the installation technology. Regardless of the material chosen, there are a number of universal rules, the violation of which will lead to leaks. The first step is always to primer the base with a primer, which improves adhesion and binds the residual dust.
When working with floatable materials, it is important not to overheat the bitumen. Excessive heating leads to burnout of modifiers and loss of elasticity, and insufficient - to poor adherence to the base. The movement of the burner should be uniform, with simultaneous rolling of the roll.
Particular attention should be paid to the adjoining walls and parapets. In these places, a reinforced waterproofing carpet is necessarily made with a material planted on a vertical surface of at least 20 cm. To protect against mechanical damage, the upper edge is fixed with a metal bar.
⚠️ Note: When installing the flooring, walk only on the ridges of the wave, using special shoes with soft soles so as not to deform the metal and not damage the polymer coating.
The final step is always to check the drainage system. Make sure that the water flows freely into the gutters or funnels, without forming stagnation anywhere. Stagnation of water is the main enemy of any roof, accelerating the destruction of materials.
To check the slope of the roof, use a long building level or pull the cord. Water should not stagnate anywhere puddles - these are the first points of leakage.
Questions and answers
Can I put a new roof over an old ruberoid?
Technically, this is possible, but not recommended by experts. The old layer can hide swelling and moisture, which will eventually destroy the new coating. In addition, the adhesion of new materials to the old oxidized surface is often low. It is better to completely dismantle the old cake or carefully prepare the base.
What is the minimum slope required for a soft roof?
For bitumen-polymer materials, the minimum slope is 1.5-3 degrees (about 2 cm per 1 meter). If the slope is smaller, increased waterproofing and no obstacles to water runoff are required, since the flow rate will be very low.
Do I need to insulate the roof of the garage from stoves?
If the garage is heated or used as a workshop, it is mandatory. Insulation (minwat, foam) prevents the formation of condensation on the inner surface of the plates in winter. For a cold garage, high-quality waterproofing from above is enough.
Which is better for a flat roof: a ruberoid or a membrane?
The membrane is more technologically advanced, durable and allows you to install without an open fire, which is safer. Ruberoid is cheaper, but requires skills when melting and serves less. The choice depends on the budget and the priorities of the owner.