Having your own place to store your car is not just a whim, but a necessity that prolongs the life of the vehicle. Construction of a permanent structure made of bricks or blocks requires significant investment and time, while metal frame allows you to build a reliable shelter in a matter of days. Exactly profile pipe has become a standard in low-rise construction due to its durability, affordable price and ease of installation.
Development of literate project is the foundation for success, because mistakes at the planning stage are difficult to correct in the finished structure. You need to decide in advance on the dimensions, type of roof and method of fastening the elements in order to avoid waste of metal. In this article we will analyze in detail all the stages of creating a project, from choosing a profile section to assembly farms.
Why a profile pipe? It has a rectangular or square cross-section, which simplifies the joining of elements and creates an aesthetic appearance for the finished garage. Unlike a round pipe, flat edges are easier to cover with sandwich panels or corrugated sheets without the use of additional adapters. This key factor, affecting the speed and cost of installation work.
Selection of material and calculation of profile section
The basis for the durability of a garage lies in the correct selection of rolled metal. For racks that take the main vertical load, a profile with a section of 100x100 mm or 80x80 mm with a wall thickness of at least 4 mm is most often used. For horizontal jumpers and piping elements, a pipe of 60x60 mm or 60x40 mm is suitable. The use of thinner metal is unacceptable, since the structure may not withstand wind load or the weight of snow.
Particular attention should be paid to the material for roofing farms. Here, a profile of 40x40 mm or 40x20 mm is often used, forming a triangular or trapezoidal structure. It is important to understand that saving on wall thickness will lead to the roof sagging under the weight of precipitation, which can lead to the destruction of the entire system. It is better to calculate the cross-section with a safety margin, especially if you plan to install heavy insulation or solar panels.
⚠️ Attention: When purchasing metal, be sure to check for quality certificates. Often on the market there is a profile with a reduced wall thickness (for example, instead of 4 mm it is actually 3 mm), which critically reduces the load-bearing capacity of the frame.
To connect the elements you will need high-quality electrode or semi-automatic welding machine. The seams must be welded on all sides to ensure the integrity of the assembly. After welding, the joints are cleaned of slag and covered with anti-corrosion primer, since it is the welded seams that are most vulnerable to rust.
Development of drawings and frame diagrams
Design begins with determining the dimensions of the future structure. The standard size for one car is 4x6 meters, however, for comfortable maintenance and placement of shelving, it is better to consider the option of 5x7 meters. The location of gates, wickets and ventilation openings must be clearly marked on the drawing. Without a detailed diagram, you risk encountering inconsistencies during installation.
The installation pitch of the racks usually varies from 2.5 to 3 meters. Increasing the pitch requires strengthening the horizontal connections or using a profile with a larger cross-section. Vertical braces provide rigidity to the frame in the longitudinal direction, preventing it from “folding.” Horizontal ties (crossbars) distribute the load from the roof to the racks.
- 📐 Dimensional accuracy: all angles must be strictly 90 degrees, distortions will lead to difficulties when covering.
- 🏗️ Foundation type: the diagram should take into account anchor bolts or embedded parts for attaching the racks.
- ❄️ Snow load: roof slope angle and truss pitch are calculated based on the construction region.
When creating a truss drawing, it is important to calculate the length of the diagonals. For a span of 6 meters, the height of the ridge truss is usually 0.8–1.2 meters. In a simplified way, the design can be represented as a triangle with additional internal braces that dampen vibrations. If you do not have an engineering education, use ready-made standard solutions or specialized calculators.
Foundation and bottom trim
A metal garage is lightweight compared to a brick one, but requires a rigid foundation to avoid deformation due to soil heaving. The optimal solution is a strip foundation or a monolithic slab. If you choose tape, then you need to pour a reinforced screed on top of it, which will serve as the floor. This will prevent dampness and rodents from entering.
The lower trim (bed frame) is laid directly on the waterproofing of the foundation. For this purpose, a large cross-section profile pipe (100x100 mm) or a channel is used. Fastening to concrete is carried out through anchor bolts with a diameter of at least 16 mm, which are installed at the stage of pouring the foundation or drilled later using a chemical anchor.
| Base type | Strength | Cost | Difficulty of installation |
|---|---|---|---|
| Monolithic slab | High | High | Average |
| Tape + screed | High | Average | High |
| Columnar | Average | Low | Low |
Waterproofing between metal and concrete is required. To do this, use roofing material or bitumen mastic. Without this layer, the metal will begin to corrode from capillary moisture rising from the ground. The corners of the binding are carefully welded and reinforced with gussets made of sheet metal 6-8 mm thick.
Installation of vertical posts and trusses
Installing the racks is the most critical stage in assembling the frame. First, corner supports are placed, which are temporarily fixed with braces. Then a cord is stretched between them, and intermediate posts are mounted along it. Verticality is checked by a plumb line or level in two planes. After alignment, the racks are welded to the embedded parts or anchored.
The next stage is lifting and installation farms. This operation is difficult to perform alone; the help of at least two people or the use of a winch will be required. The trusses are installed in increments of 1 meter (or according to the design) and welded to the upper ends of the racks. It is important to ensure the same distance between the trusses along the entire length of the garage.
☑️ Stages of frame assembly
“Bulls” or mounting plates are often used to connect the trusses to the posts, making positioning easier. If the trusses were made as composites (of two halves), they are joined on the ground and then lifted as a whole. Welds at joints must be made with special care, since maximum stress is concentrated here.
Purlin system and roof covering
Purlins are laid on top of the trusses - horizontal pipes of a smaller cross-section (40x20 mm or 60x40 mm), onto which the roofing material is directly attached. The pitch of the purlins depends on the type of coating: for corrugated sheeting it is usually 0.5–1 meter, for metal tiles - strictly according to the wave. The purlins also serve as links, providing spatial rigidity to the roof.
The most popular roofing for garages made from a profile pipe is a profiled sheet (corrugated sheet) or metal tiles. These materials are lightweight, durable and easy to install. Fastening is carried out with special self-tapping screws with a rubber washer, which are screwed into the lower part of the corrugated sheet wave. This prevents leaks at the fastening points.
- 🌧️ Roof slope: the minimum angle for corrugated sheeting is 8-10 degrees, otherwise the snow will not roll down.
- 🔩 Fasteners: use self-tapping screws with EPDM seal, resistant to ultraviolet radiation and temperature changes.
- 💨 Wind protection: the ends of the roof must be covered with wind strips so that gusts of wind do not tear off the coating.
⚠️ Attention: When installing the roof, do not overtighten the screws. Clamping too tightly will damage the rubber washer, which will lead to rapid drying of the seal and leaks after a year or two of use.
Wall cladding and gate installation
After completing the roofing work, they begin covering the walls. A frame made of a profile pipe allows you to use various materials: corrugated sheets, sandwich panels, siding or even polycarbonate to create translucent areas. The sheet material is fastened to vertical posts and horizontal connections every 50-70 cm.
Gates can be swinging, sliding or lifting. For a frame garage made of pipes, swing gates welded from the same 40x40 mm profile are ideal. They are easy to manufacture and reliable. If you choose an overhead sectional door, it is necessary to strengthen the opening in advance with additional vertical posts and a lintel, since the weight of the sections and guides creates a significant load.
To insulate the garage from the inside, mineral wool or expanded polystyrene is placed between the frame profiles. On the inside, the insulation is covered with a vapor barrier film and sheathed with plasterboard or OSB boards. This turns a light hangar into a full-fledged room suitable for work in winter.
Do I need to ground a metal garage?
Yes, grounding is required. The metal frame is an excellent conductor, and in the event of a thunderstorm or electrical short circuit inside the garage, it can become a source of danger. The ground loop is made from a steel angle or strip buried in the ground next to the garage and connected to the frame by welding or bolting.
How to treat a pipe against rust before welding?
If there is rust on the profile, it must be cleaned with a grinder with a flap wheel until there is a metallic shine in the areas of future seams. The rest of the surface can be treated with a rust converter, but welding cannot be done through it. After assembly, the entire frame must be primed.
What truss pitch is optimal for a 4 meter garage?
For a span of 4 meters and using a profile pipe of 40x40 mm or 50x50 mm, the optimal truss pitch is considered to be 1 meter. This provides sufficient rigidity for snow loads up to 180-200 kg/m² (middle band). Increasing the pitch to 1.5-2 meters will require a significant increase in the profile section.