Building a reliable car shelter is a task that every vehicle owner faces. A 6 by 6 garage made from a profile pipe is one of the most popular and rational solutions for a summer house or private home. This design provides sufficient space not only for parking, but also for organizing a full-fledged repair area or workshop. The use of rolled metal allows you to build a strong frame in the shortest possible time, minimizing the cost of heavy construction equipment.
The main advantage of frame technology is its high strength with a relatively low weight of the structure. Profile pipe, unlike round pipe, has better bending resistance characteristics, which makes it an ideal material for load-bearing posts and trusses. A properly designed frame can withstand significant snow and wind loads typical of many regions. At the same time, the cost per square meter of the finished building remains competitive compared to permanent brick or block buildings.
In this article we will analyze in detail all the stages of creating a garage, starting with choosing the metal section and ending with wall cladding. You will learn about the nuances that beginners often miss, which can lead to structural distortion or corrosion. A competent approach to planning and purchasing materials will allow you to avoid unnecessary costs and mistakes. We build a garage with our own hands, relying on proven technical solutions.
Design and selection of profile pipe section
Before starting any work, it is necessary to clearly understand what loads the future structure will experience. A 6 by 6 meter garage has a fairly large roof area, which requires careful calculation of the snow cap. The main load-bearing element is profile pipe, the cross-section of which is selected based on the length of the span and the height of the building. For racks, a square profile of 100x100 mm or 80x80 mm with a wall thickness of at least 4 mm is most often used.
For horizontal purlins and truss elements, you can use a pipe of a smaller cross-section, for example, 60x60 mm or 50x50 mm. It is important to consider that saving on the thickness of the metal wall is unacceptable, since this directly affects the stability of the entire frame. If you plan to cover the garage with heavy materials, such as corrugated sheets with insulation or sandwich panels, the safety margin should be increased. The design scheme must take into account not only the weight of the roof itself, but also the possible wind pressure.
Particular attention should be paid to the span length of 6 meters. This is a significant distance, which without additional intermediate supports requires the use truss system rafters Simple beams can bend under their own weight and the weight of snow, which will lead to deformation of the entire structure. Trusses allow you to redistribute the load and transfer it to the vertical posts, ensuring the rigidity of the entire system.
Why are trusses better than beams?
The truss structure works on compression and tension of the elements, which allows you to use less metal with greater load-bearing capacity. A simple beam bends, requiring a much more powerful and expensive section for a span of 6 meters.
- 🏗️ Frame stands: profile 100x100x4 mm for corner supports.
- 🏗️ Rafter trusses: profile 60x60x3 mm or 50x50x3 mm depending on the pitch.
- 🏗️ Sheathing for the roof: profile 40x20 mm or 50x20 mm.
- 🏗️ Rigidity connections: 40x40 mm profile for braces in the plane of the walls.
Foundation and foundation preparation
The quality of the foundation determines the durability of the entire structure. A garage made of a profile pipe is lighter than a brick one, but still requires reliable support, especially if you plan to install gates and heavy equipment. The most common and economical solution is shallow strip foundation. It ensures uniform load distribution and protects the lower trim from contact with the ground.
The process begins with marking the area according to dimensions of 6 by 6 meters. A trench 40-50 cm deep is dug along the perimeter, after which formwork and reinforcement cage are installed. It is important to provide embedded parts or anchor bolts for fastening the lower trim of the metal frame. Concrete must gain full strength within 28 days before installation of metal structures begins.
The second option is to use screw piles. This method allows construction to begin even in winter and on difficult soils. The piles are screwed in around the perimeter and in the places where the load-bearing columns are installed. After installation, they are tied with a channel or large-section profile pipe, creating a single platform. This method is less labor-intensive, but requires precise control of the verticality of the piles.
⚠️ Attention: Never install a metal frame directly on the ground or asphalt without waterproofing. Capillary rise of moisture will lead to rapid corrosion of the lower trim, even if the metal is painted. Use bitumen mastic and roofing felt.
Frame assembly: bottom frame and racks
Installation of the frame begins with the bottom trim, which connects the foundation into a single system. For this, a profile pipe with a cross section of 100x100 mm or 120x120 mm is used. The pipes are laid out along the perimeter of the foundation, the diagonals are checked (they must be perfectly equal) and fixed temporarily. After leveling, welding of corners and joints is carried out.
The next stage is the installation of vertical racks. They are welded to the bottom trim strictly perpendicularly. To control the vertical, be sure to use a building level or plumb line. At this stage, it is important to immediately set the correct height of the gate opening; usually it is 2.5–3 meters. The remaining racks can be the same height or higher if you plan to have a pitched roof with a slope back.
To ensure spatial rigidity, horizontal connections are welded between the posts. They prevent the frame from folding lengthwise or crosswise. Often connections are arranged in three levels: below, in the middle and under the roof. All welds must be cleaned of slag and coated with anti-corrosion primer immediately after cooling to prevent oxidation.
☑️ Checking frame geometry
Pay special attention to the gate opening. Strengthening is often required here, since it is in this area that some connections are missing. You can use a pipe with a thicker wall or a double profile. If you are planning to install sectional doors, make sure the side posts are reinforced to support the guides.
Installation of rafter system and trusses
The garage roof, 6 by 6 meters, is the most critical unit, taking the main snow loads. For a span of 6 meters, the use of simple beams is ineffective, so triangular trusses are assembled. They can be fabricated on the ground and then lifted and installed onto finished posts using a crane or winch. The truss installation step is usually 2-3 meters.
The truss consists of upper and lower chords, as well as braces (braces) inside the triangle. The upper belt sets the slope of the roof, which must be at least 10-15 degrees for snow slope. The lower belt serves as the ceiling for the garage and the basis for the filing. All connections of truss elements are made using sheet metal gussets, which increases the area of the weld and the reliability of the unit.
After installing the trusses, a sheathing made of a 40x20 mm profile pipe is welded along the upper chord. The sheathing pitch depends on the type of roofing material: for corrugated sheeting, 0.5–1 meter is enough; for metal tiles, the pitch must exactly correspond to the wave. A cornice overhang is made along the perimeter of the roof so that water flows further away from the walls and foundation.
| Design element | Recommended pipe cross-section (mm) | Wall thickness (mm) | Note |
|---|---|---|---|
| Main racks | 100x100 | 4.0 | Load-bearing columns |
| Bottom harness | 100x100 or 120x120 | 4.0 - 5.0 | Frame base |
| Trusses (belts) | 60x60 or 80x80 | 3.0 - 4.0 | Depends on snow load |
| Lathing | 40x20 or 50x20 | 2.0 - 3.0 | Under roofing |
| Stiffness connections | 40x40 or 60x60 | 3.0 | Longitudinal stability |
Use a jig to assemble trusses. Assemble one reference truss, fix its position and weld the rest according to the template. This ensures that all trusses are the same and the roof is level without distortions.
Welding work and anti-corrosion protection
The quality of welded joints is the key to garage safety. For profile pipes, shielded gas arc welding (MIG/MAG) or manual arc welding (MMA) with a 3 mm electrode is optimal. It is important to weld seams on all accessible sides, avoiding lack of welding. If the pipe has a large wall thickness, it may be necessary to cut the edges at an angle of 45 degrees.
After completing all welding work, it is necessary to clean each seam with a grinder with a flap wheel. Scale and slag must be completely removed, as corrosion quickly develops underneath them. Then the entire structure is degreased and coated with a metal primer. It is recommended to use primers with a rust converter if there are already traces of oxidation on the metal.
The final coating is selected based on the budget and operating conditions. Alkyd enamels are cheaper, but fade and crack faster. Polyurethane paints and hammer enamels are more expensive, but create a durable film that is resistant to mechanical damage and ultraviolet radiation. Pay special attention to the ends of the pipes - they need to be sealed with plugs or silicone to prevent moisture from getting inside the profile.
⚠️ Attention: Do not paint metal at temperatures below +5°C or in high humidity. Condensation appearing on cold metal will negate all efforts at protection, and rust will come out from under the paint in the first season.
Wall and roof cladding: choice of materials
To cover a garage from a profile pipe, a profiled sheet (corrugated sheet) is most often used. This is a lightweight, durable and inexpensive material. A sheet with markings is suitable for walls C (wall) wave height 8-21 mm. For roofing it is better to use a more rigid sheet with markings NS or N wave height from 35 mm, which will withstand snow and walking during installation.
The sheets are fastened with roofing screws and a rubber washer. They must be twisted strictly perpendicular to the surface, without squeezing the rubber band, so as not to damage the seal. The sheets are laid overlapping on one wave. If the garage is planned to be used as a warm workshop, a layer of insulation (mineral wool or polystyrene foam) and a vapor barrier film are laid between the metal and the frame.
Sandwich panels can be an alternative to corrugated sheeting. They already contain insulation and are assembled like a construction set. This speeds up the construction process and immediately provides thermal insulation. However, the cost of such a garage will be significantly higher. The gates are also sheathed to match the main structure; the frame for them is made more dense so that the leaf does not flapping in the wind.
Frequently asked questions (FAQ)
Do you need a drawing for a 6 by 6 garage or can you build it by eye?
It is highly not recommended to build a garage of this size without a drawing. An error in calculating trusses or choosing a pipe section can lead to the collapse of the roof under the snow. The drawing allows you to accurately calculate the amount of metal, avoid unnecessary trimmings and correctly plan gates and windows.
Which foundation is best for a garage on heaving soil?
On heaving soils that freeze strongly and swell in winter, a foundation on screw piles is best suited. It penetrates the freezing depth and is not subject to the forces of frost heaving, unlike a shallow-depth tape, which can warp.
How to treat the inside of a profile pipe so that it does not rust?
If the garage is not heated, a good quality primer and paint will suffice. If there is high humidity or heating inside, it is recommended to use special rust converters before painting, and be sure to weld the ends of the pipes or close them with plastic plugs.
Is it possible to expand a garage from a profile pipe in the future?
Yes, modularity is one of the main advantages of frame garages. If during construction you provide technological holes in the end walls and make a foundation with a reserve or a pile foundation, the structure can be easily increased in length by adding another span.
What is the optimal gate height for a passenger car?
For standard passenger cars and crossovers, the optimal height of the gate opening is 2.5 meters. This is enough to spare. For minibuses or SUVs with an expeditionary trunk, the height should be increased to 2.7–3 meters.