Carport for two cars: design and construction

Protecting your car from the scorching sun, hail, snow and bird droppings is not a luxury, but a necessity to preserve the paintwork and extend the life of the body. When the family budget includes two vehicles, the issue of parking becomes especially acute, because simply parking them in the open air becomes risky. Carport for two cars is an excellent alternative to a full-fledged garage, providing the necessary ventilation and protection, while remaining significantly cheaper and easier to construct.

Unlike a permanent garage, this design does not require complex ventilation and a massive foundation, which makes it an ideal solution for a summer house or private home on a limited budget. A properly designed parking lot will protect equipment from paint fading, corrosion and mechanical damage caused by natural factors. It is important to immediately decide on the type of construction, since single-pitched and gable options require a different approach to calculating loads.

Modern materials make it possible to assemble a reliable structure in just a few weekends, using a minimal set of tools. However, in order for the structure to stand for decades and not collapse after the first snowfall, it is necessary to strictly adhere to installation technologies and take into account regional climate characteristics. In this article we will analyze in detail all the stages: from choosing a location to the final installation of the roofing.

Selecting the optimal location and calculating the dimensions of the structure

The first and most important step is to choose the location where your parking will be located. It is necessary to take into account not only the convenience of check-in, but also the wind rose, groundwater level and the possibility of connecting electricity for lighting. The distance to the residential building should be sufficient to prevent exhaust gases from entering the windows, but at the same time allow for convenient wiring.

The dimensions of the canopy for two cars are calculated based on the average size of modern sedans and crossovers. The standard width of one parking space is 3 meters, however, for comfortable opening of doors and boarding passengers, it is better to allow 3.5 meters per car. Therefore, the minimum overall width of the structure should be approx. 7 meters.

The length of the parking lot usually varies from 5.5 to 6 meters, which allows you to accommodate even extended versions of cars with extra space for the trunk. The height of the visor also plays a role: too low will interfere with the installation of a roof rack, and too high will create windage. The optimal height for the front edge is about 2.3–2.5 meters and the rear edge (for slopes) is at least 2 meters.

⚠️ Attention: When planning the site, be sure to take into account the future landscape design and the possibility of heavy equipment access for maintenance, if necessary. Do not place the canopy close to trees - falling branches can damage the roof.

Don't forget about technological gaps. There should be free space between the racks and the body so as not to accidentally scratch the car when parking. It is also worth providing space for the possible installation of additional shelving or hooks for storing garden tools around the perimeter.

Choice of materials: metal, wood or polycarbonate

The building materials market offers many options, but for the frame they most often choose between a metal profile and timber. The metal profile pipe has high strength and durability, requiring only periodic anti-corrosion treatment. Wood looks more aesthetically pleasing and environmentally friendly, but requires constant care, impregnation with antiseptics and protection from moisture.

For roofing, the most popular solution is cellular polycarbonate. This material is lightweight, allows light to pass through (which is important if a recreation area is planned under the canopy) and holds snow loads well when installed correctly. Metal tiles or corrugated sheets are heavier options that require a reinforced frame, but they provide complete protection from ultraviolet radiation and better insulate from rain noise.

• 🏗️ Profile pipe 80x80 mm - ideal for main support pillars, withstands enormous bending loads.
• 🪵 Glued laminated timber — more stable than a solid array, less susceptible to deformation and twisting when humidity changes.
• ☀️ Polycarbonate with UV protection - required for regions with active sun, prevents fading of car paint.

When choosing a roofing material, consider its noise level. The metal rattles a lot when it rains, which can disturb the residents of the house if the canopy is adjacent to the bedroom. Polycarbonate or soft roofing (ondulin) is much quieter in this regard. It is also important to remember about the flammability class of materials, especially if a barbecue area is planned nearby.

Foundation and installation of support pillars

The reliability of the entire structure directly depends on the quality of the foundation. Since the weight of the canopy is much less than the weight of the house, making a continuous strip foundation is often impractical. The most effective solution for support pillars is to install separate concrete cups or use screw piles that can be screwed in one day.

If you choose concreting, then the depth of the holes should exceed the soil freezing level in your region, usually 1.2–1.5 meters. A sand and gravel cushion 15–20 cm thick is poured into the bottom of the pit for drainage, after which formwork and reinforcement cage are installed. The pillars are fixed strictly vertically, checking the position with a level in two planes.

Scheme for preparing a hole for a pole:
1. Dig a hole 40x40 cm, depth 120-150 cm.
2. Fill in 15 cm of crushed stone and compact it.
3. Install the formwork (height above ground 20 cm).
4. Insert the reinforcement cage and support pipe.
5. Pour concrete grade M200-M250.

In the case of using screw piles, the process is faster, but requires an accurate calculation of the bearing capacity of the soil. The piles are screwed in manually or mechanically until dense layers of soil are reached, after which the pipe cavities are concreted to prevent corrosion from the inside. The pile head is then welded to the metal structure of the canopy.

⚠️ Attention: Never skimp on the depth of the foundation. Heaving of the soil in the spring can warp light pillars, leading to the destruction of the roof and damage to parked cars.

After the concrete has hardened (usually 7–14 days to gain strength), you can begin installing the top trim. Metal elements are welded, and wooden elements are connected with powerful bolts or metal plates. All seams and joints must be treated with anti-corrosion compounds.

Installation of frame and roofing system

Assembly of the frame begins with the installation of the Mauerlat (for wood) or the top trim (for metal). This is a connecting element that distributes the load from the roof to the supporting pillars. For two cars, the span is quite large, so it is often necessary to install additional trusses or arches to prevent the roof from sagging under the weight of snow.

The pitch of the rafter legs or purlins depends on the selected roofing material. For polycarbonate, the distance can be 1–1.5 meters, while for heavy tiles the step should be reduced to 0.6–0.8 meters. It is important to ensure the necessary slope of the slope for efficient water drainage; The minimum tilt angle for polycarbonate is 5 degrees, for metal tiles - 14 degrees.

Fastening roofing sheets requires the use of special thermal washers (for polycarbonate) or roofing screws with rubber seals. The fasteners must be tightened perpendicular to the surface, avoiding overtightening, which can deform the material. The joints of the sheets are closed with connecting profiles, ensuring tightness and compensation for thermal expansion.

Pay special attention to the ends of the structure. If the canopy is open on the sides, then the wind load is minimal. If partial glazing or lining of the sidewalls is planned, it is necessary to strengthen the vertical posts and foundation, since the windage of the structure will increase many times over.

Comparison of roof types and their characteristics

The choice of coating affects not only the appearance, but also the microclimate under the canopy. To make it easier for you to decide, we have prepared a comparative table of the main materials used to organize parking lots.

Material	Service life (years)	Difficulty of installation	Noise insulation
Cellular polycarbonate	10–15	Low	High
Corrugated sheeting (metal)	20–30	Average	Low
Metal tiles	30–40	High	Low
Ondulin (bitumen)	15–20	Low	High

Polycarbonate is good because it is not so stuffy under it in the summer, since part of the heat escapes through the transparent structure if a material with the correct light transmittance is chosen. However, it requires careful cleaning of snow; sharp objects should not be used. Metal roofs are more durable, but in the summer it can be hot under them, although this is not as critical for a car as for a person.

Bituminous shingles or ondulin perfectly dampen the sound of rain, but require continuous sheathing, which increases wood consumption and the overall cost of the structure. In addition, such materials are more flammable and require strict fire safety measures, especially if there are sources of open fire nearby.

Secrets of polycarbonate durability

When installing polycarbonate, always place the sheets with the marked side (with UV protection) facing out. If you mix up the sides, the material will collapse under the sun in 2-3 years. Also leave gaps in the joining profiles for thermal expansion.

Drainage, lighting and additional options

Just putting up a canopy is not enough - you need to organize water drainage. Stormwater runoff from the roof can turn the area under cars into a swamp or damage the foundations of nearby buildings. It is recommended to install gutters along the lower slope and drain the water through pipes into a storm drain or drainage well.

Lighting a parking area is a matter of safety and comfort. It is better to place the lamps on support poles at a height of at least 2.5 meters, so as not to blind the driver or hit the trunk. To save energy, use motion sensors or twilight switches that will turn on the lights only when necessary.

• 💡 LED spotlights — produce bright white light, do not heat up and consume minimal energy.
• 💧 Storm sewer - mandatory to prevent the formation of puddles and ice in winter.
• 🔌 220V socket - useful for connecting a compressor, washing or charging power tools.

As an additional improvement, you can consider installing side curtains made of awning fabric. They will protect the car from slanting rain and snow, as well as from dust in windy weather. These curtains can be easily removed in summer for better ventilation.

⚠️ Attention: Electrical wiring under a canopy should only be carried out in corrugated pipes or cable ducts intended for outdoor use. All connections must be sealed and protected from moisture.

Questions and answers (FAQ)

Is it necessary to make a concrete platform under a carport?

Making a full-fledged concrete slab is not necessary, but it is advisable. Asphalt or paving slabs will protect from dirt and dust. If budget is limited, geogrid can be used with crushed stone backfill to provide excellent drainage and a solid surface.

What is the minimum roof pitch required for an awning?

For polycarbonate, the minimum slope is 5-7 degrees, for metal tiles - at least 14 degrees. A smaller slope will lead to stagnation of water and leaks, as well as an increase in snow load in winter.

Is it possible to attach a carport to a house?

Yes, this is a popular option. However, you cannot rigidly connect the canopy structure to the house, since they have different shrinkage. Use expansion joints and sliding fasteners. Also check whether the extension does not interfere with the lighting of the rooms on the first floor.

Will the canopy support the weight of the snow cover?

If the calculation is done correctly taking into account your region (snow load), it will withstand. For central Russia, the structure should withstand about 180 kg/m². It is important to clear snow from polycarbonate in a timely manner if its layer exceeds 20-30 cm.