Arranging a reliable shelter for a car is not just a matter of comfort, but the need to extend the life of the vehicle. Roof in the garage with his own hands This is a real task for a home builder, which allows you to save significant money on the services of professional builders. Properly designed and mounted roofing will protect the car from rain, snow, hail and scorching sun, creating an optimal microclimate indoors.
Before starting to purchase materials, it is necessary to clearly determine the type of construction and loads that the structure will carry. In most cases, for separate standing or attached garages are selected roof-topIt is the easiest to perform and requires a minimum amount of materials. However, even such a seemingly simple design requires careful preparation, calculation of the angle of inclination and selection of high-quality design. waterproofing.
In this article, we will discuss in detail all stages of construction, from the design of the truss system to the finishing surface. You will learn about the nuances of working with various materials, understand how to ensure the durability of the design and avoid the typical mistakes of beginners. Self-installation This will allow you to monitor each step of the process and be confident in the quality of the work done.
Design and calculation of loads
Any construction starts with a competent design, and garage roofing is no exception. The planning phase should take into account the climatic features of the region, in particular, the average rainfall in winter and the strength of winds. These parameters will determine slope and cross-section of the beams used. If you live in a snowy area, the stingray should be steep enough that snow does not linger on the surface, creating a critical load.
The optimal angle of inclination for a single-slop structure is considered to be a range of 15 to 30 degrees. A smaller angle will require a reinforced truss system and perfect waterproofing, as the water will drain slowly. A larger angle will increase the sailing structure, which will require more reliable attachment to the walls. For cross-section calculation joist and step rafters can use special online calculators or tables SNIP.
⚠️ Warning: Never skimp on the cross section of the rafters legs. The sagging of the roof under the weight of snow can lead to irreversible deformation of the walls of the garage and the destruction of the entire structure.
Also at the design stage, it is important to determine the direction of water flow. Rain and melt water should not drain onto the foundation of a neighboring building or onto a pedestrian area. Often, they are installed to drain water. drainage Or make a special pavement with a slope from the walls of the garage. An accurate drawing will help calculate the required amount of lumber and roofing, minimizing waste.
Selection of materials for the truss system
The basis of any roof is its frame. For the garage, a wooden timber is most often used, as it is available, easy to handle and has sufficient strength. Standard material for rafters and mauerlat is considered pine-timber cross-section 150x50 mm or 200x50 mm. The wood should be dry, without large knots and traces of rotting, otherwise the service life of the structure will be sharply reduced.
Before installation, all wooden elements must be processed. antiseptic and flame retardant. The antiseptic will protect the bar from mold, fungus and insects, and flame retardant will reduce the combustibility of the material, which is critical for the fire safety of the garage. It is better to carry out the treatment in two layers, giving each layer to dry completely before assembly of the structure.
As an alternative to wood, you can consider a metal profile, but working with it requires welding skills and more complex cutting equipment. Wooden rafter more forgiving for the beginner and allows you to use simple carpentry tools. To connect the elements, metal corners, plates and galvanized screws are used, which prevent corrosion in the places of the fastener.
- 🌲 Pine timber is the most popular and affordable option for the frame.
- 🛡️ Antiseptic impregnation is mandatory for protection from moisture and biological destruction.
- 🔩 Metal fasteners – use only galvanized elements for durability.
- 📏 Board trimmed - necessary to create a crate for roofing material.
☑️ Verification of materials
Installation of mauerlat and rafting legs
Installation of the frame begins with the installation of mauerlat - a support bar, which is laid on the upper end of the walls. If the walls of the garage are made of brick or gas block, under the mauerlat must be laid a layer. waterproofingLike a ruberoid. Mounting the bar to the wall is carried out with the help of anchor bolts or studs, which are laid at the stage of construction of walls.
After fixing the mauerlat, they begin to install the truss legs. The step between rafters is usually 60 to 100 cm, depending on the planned load and the type of roofing material. For a garage, 80 cm is considered the optimal step. The rafters are cut into the mauerlat or fastened with special metal supports, providing a rigid fixation.
It is important to observe a single plane of the slope. To do this, the extreme rafters are installed first, and a control cord is stretched between them. All intermediate elements are aligned strictly to this level. Altitude difference between the front and back walls of the garage should correspond to the planned angle of inclination.
Nuances of attachment to different walls
If one wall is higher than the other, the mauerlat on a high wall can not be used, making a log of rafters directly into the wall or using special brackets. On a low wall, the timber is mandatory for an even distribution of the load.
In parallel with the installation of rafters, puffs or rigs are mounted, which prevent the legs from diverged under load. This is especially true for large-sized skies. The design should be rigid and stationary, any backlashes at this stage are unacceptable.
Crate and vapour insulation device
When the truss system is ready, they move on to creating a crate. It serves as the basis for fastening the roofing material and evenly distributes the load. For the crate, a trimmed board with a thickness of 25-30 mm or moisture-resistant plywood is used. The step of the crate depends on the type of finishing: for hard materials (slate, proflist), the step can be rarefied, for soft ones (ruberoid, bitumen shingles) it is required. flat-floor.
Particular attention should be paid to vapor isolation. Warm air from the garage, rising up, condenses on the cold underside of the roof, causing the wood to rot. To avoid this, under the crate (or under the insulation, if the roof is planned to be warm) is laid. vapor-proofing. It is fastened with a cover of 10-15 cm and fixed with a construction stapler to the rafters.
⚠️ Attention: When installing vapour insulation, monitor the tightness of the joints. Even small tears of the film will negate all protection against moisture, leading to rapid destruction of the insulation and wood.
If you plan to insulate the garage, then heat insulation material is laid between the rafters, most often mineral-wool or polystyrene. The insulation should fit tightly to the rafters, but not be compressed to maintain its thermal insulation properties. On top of the insulation is also closed with a layer of windproof membrane.
| Roofing material | Crate type | Step crate | Weight 1 sq.m. |
|---|---|---|---|
| Fresh-natil | Sparse | 30-50 cm | ~5 kg |
| Metal tile | Sparse | 35 cm | ~5 kg |
| ondulin | Frequent or solid | 45 cm (axis) | ~3 kg |
| ruberoid | Complete (plywood/OSB) | 0 cm | ~5 kg |
For a solid crate under a soft roof, use OSB-3 sheets 10-12 mm thick - this will provide a perfectly flat and durable surface.
Selection and installation of finishing coating
The choice of roofing material is a balance between budget, durability and aesthetics. One of the most popular options for garage is flooring. It is lightweight, durable, does not require complex maintenance and is available in a wide range of colors. Installation of the profile list begins with the bottom row with a swing in one wave. Fixing is carried out by special roof screws with a rubber washer in the deflection of the wave.
Another budget and time-tested option is ruberoid or its modern analogues (Euroruberoid). This material is ideal for flat or low-sloping roofs. Installation is carried out by fusing using a gas burner or gluing to a bitumen mastic. It is important to lay the ruberoid in several layers (usually 2-3), providing overlapping of the canvases.
Metal roofing looks aesthetically pleasing, but requires more complex installation and more finishing elements. slate (asbestos cement or modern asbestos-free) is characterized by durability, but has a large weight, which requires a reinforced truss system. When choosing a material, take into account not only the price per square meter, but also the cost of finishing elements, fasteners and the complexity of installation.
- 🏗️ Durability – Choose materials with a lifespan of at least 20 years.
- 🌧️ Tightness - pay special attention to the places adjacent to the walls and the ventilation terminals.
- 🔨 Ease of installation - for independent work it is better to choose a flooring or ondulin.
- 💰 Cost – consider the full estimate, including all components.
The final stage of installation is installation wind-bar And the cornice overhangs. These elements protect the underroof space from blowing the wind and getting oblique rain. All places of adjoining the roof to vertical surfaces (walls, pipes) must be carefully sealed with bitumen or polyurethane mastics.
Properly designed overhangs and cornices prolong the life of the walls of the garage, diverting water further from the foundation.
Roof care and typical mistakes
Even the best roof requires periodic maintenance. At least twice a year, in spring and autumn, it is recommended to hold visualization coverings. It is necessary to remove fallen foliage, branches and other debris that can trap moisture and contribute to rotting. In winter, the roof should be cleaned of excess snow in a timely manner, if the angle of inclination is not sufficient for its independent descent.
One of the typical mistakes in construction is neglecting the ventilation of the underroof space. The lack of air circulation leads to the accumulation of condensate, which is harmful for wooden structures. Make sure you leave. ventilation between the insulation and waterproofing, and also install the vents in the cornice and skate zones.
⚠️ Warning: Do not use metal shovels or scrapers with sharp edges to clean the roof. You can damage the protective layer of the roofing material, which will lead to corrosion and leaks.
Also, there is often an error in the calculation of the load-bearing capacity. Savings on the section of the beam or increasing the pitch of the rafters "by eye" can lead to sagging of the roof under the weight of snow. It is always better to make a margin of safety than to engage in expensive repairs. Regular painting Metal elements and processing of wooden parts with protective compounds will significantly extend the life of your garage.
What to do if a leak is found?
First, find the location of the damage. If it is a crack in the metal, use a bitumen tape or a special sealant. If the problem is in the joint, miss it with mastic. A temporary solution can be installed from the inside, but a major overhaul requires access from the outside.
What is the minimum roof slope for a garage?
The minimum slope depends on the material. For profnatile is recommended at least 8-10 degrees, for rolled materials (ruberoid) allowed up to 3 degrees, provided a solid crate and high-quality waterproofing. The optimal slope is considered to be 15-20 degrees.
Do I need to insulate the roof of the garage?
If the garage is heated or you plan to spend a lot of time in it in winter, insulation is a must. For a cold garage, where the car only sleeps, enough quality ventilation to remove moisture coming with the car.
What is better to fasten the flooring: nails or screws?
Exceptionally special roof screws with EPDM-laying. Nails over time shatter from vibration and temperature expansions, and do not provide tightness of the hole.
How often should I change the ruberoid on the roof?
The service life of a conventional ruberoid is 5-7 years. Modern floatable materials (euroruberoid) last 15-20 years or more. The term depends on the quality of installation, the slope of the roof and climatic conditions.