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When Jean-Marc Tournebize decides to build a carport, he sees big. His shows nearly 30 m2 of floor space, under a height between 2.20 and 2.90 m. The care taken in the realization is in agreement, and it offers multiple possibilities of development.

A carport made by an individual like a pro

Level : beginner
Time : 20 hours
Cost: Around € 3,000
Equipment: circular saw, drill, perforator, tools, finder and mason.

See the plan of this realization (in pdf): Shelter for car: the plan

Building permit required for a carport

Given its size, the project was the subject of a building permit filing, mandatory. The shelter at a slope is leaned against the west gable, along the garage. On the front of the house, it is aligned in the extension of the facade.
At the rear, the slope of the original roof is asymmetrical and descends lower than at the front. The ridge of the shelter is aligned with the highest sewer line of the house, around 2.90 m. Thus placed as high as possible, it makes it possible to obtain the slope necessary for the terracotta tiles and to preserve a minimum height in foot of slope of more than 2.20 m.
By respecting these simple principles, the shelter does not unbalance the overall harmony of the building.
With the land boundary at 3 m, it was difficult to take better advantage of the available space and the existing configuration.
The other advantage of this provision is the simplification of implementation. The shelter is simply added to the existing building, without any need for any recovery, on the cover or flow of rainwater, for example.
The floor consists of a classic concrete slab, dosed at 350 kg of cement per cubic meter. With a thickness of about 12 cm, it is armed with peripheral ropes of ø 10 mm and welded mesh plates. It shows a slight slope forward (1 cm per meter) to facilitate the evacuation of rainwater. A gutter with a grid borders this slab on the length of the garden. Given the slope of the ground, the slab forms an overhang of a few centimeters. A layer of crushed gravel in front of the house redraws the traffic lanes and compensates for this difference in level.

The frame of the carport

The main elements of the frame are in spruce. They have been recovered, but commercial woods, of more traditional sections, can be used. Each piece was planed and tinted before final assembly.
Given the coverage area, a ridge tip and a sandpit could have been enough. But an intermediate breakdown, for the anecdote added after the chevron, confirms the overall stability. It rests on two half-trusses with horizontal entry, one at the front and one at the center. At the back, it is supported by a vertical pole.
As it was reported after the installation of the rafters, this intermediate failure and the half-trusses are connected by metal connectors, hooves for the links and two straight connections for the bottom post.
The location of the ridge is adjusted level and the failure is fixed to the pinion with six studs, sealed every 120 cm. For this type of application, chemical sealing is recommended, especially in the honeycomb type blocks, as is the case here.
Ridge and intermediate faults have a fairly large section, that is 115 x 135 mm. Standardized bastaings or planks of commerce could have sufficed. For its part, the sandpit displays the same thickness, but a much larger width of 275 mm. It is stuck in a U-notch, cut at the top of the three poles.
These have a section of 195 x 200 mm. The whole is locked by bolting then balanced by reported struts.
The originality of the assembly relies on the use of adjustable feet at the base of the posts. It is a practical way to adjust the levels which also allows to isolate the wood from any contact with the ground and to make a bonding as solid as aesthetic with the slab. This, thanks to a simple bolting on threaded rods, sealed.
The rafters, 60 x 90 mm section, are arranged every 60 cm and nailed. They support the battens of 27 x 27 mm.

Carport cover

The cover is made of Alpha 10 tiles (Imérys), color aged in the mass. It is a large interlocking tile with flat flange, widely used in Alsace, Burgundy, Franche-Comté, Ile-de-France and Rhône-Alpes. Its harmonious proportions, its bevelled nose, give it a sober and modern line. She is cross-joint pose.
Thanks to its dimensions (455 x 310 mm) and its variable flange, from 330 to 370 mm, this tile offers a great ease of implementation. Especially in the present case, it ensures continuity with the existing roof, made with the same material. It takes about 10.5 tiles per square meter (370 mm gauge), resulting in a load per square meter covered of 46.5 kg.
The roof of the shelter is bordered by two co-ordinated banks, right-sided, left-facing, to take into account the laying direction of the tiles (from bottom to top and from right to left).


In addition to the grid gutter at the edge of the slabRainwater harvesting is ensured by a conventional 65 mm dia. It is connected to an 80 mm descent connected to a concrete manhole with a visit buffer placed at the foot. This look also retrieves the exit of the grid gutter.
The whole is connected to the storm water collector of the street by a pipe of 100 mm in diameter.
The size of the network is calculated according to the coverage area served. In this case, this arrangement is simplified by the location of the main collector at the edge of the road, almost opposite. There is no connection on the existing network, before the main collector.

Choosing the location of a carport

to draw the location of a carport

The location of the shelter is delimited by a path to powder. It takes over the main layout, in width and length, as well as the path of the evacuation pipe towards the main collector.

Identify the height of the breakdown

locate the height of the ridge tip

The height of the ridge is marked with the line at 2, 88 m, well wedged between the two slopes of the main roof. This piece is mounted on threaded and bolted studs, sealed in the gable wall.

Cut the support posts

support posts for carport

The support posts, in spruce, are intersected to 2 m in length and equipped with their stainless steel foot. The installation of the sandpit (115 x 275 mm) on the three posts is done with a handsaw.

Nest and adjust the feet

set the feet of a wooden carport

The adjustable feet consist of two parts, nested one inside the other by a threaded axis. The adjustment is made by screwing or unscrewing. They also offer the advantage of insulating the posts from the ground.

Fix the sandpit

to install the sandpit of a carport

The bolting of the sand pit at the top of the posts is done before the training. The set is wedged provisionally by boards and props, doubled by the establishment of some rafters.

Arrange the rafters

lay the rafters of a carport

The intermediate rafters are arranged at constant spacing, every 60 cm. The top of the ridge tip has been slashed to the plane to facilitate nailing. Shoring can then be removed.

To assemble

assembly of the foundations of a carport

The intermediate failure is based on two rafters and a vertical post. The links are fixed to the wall and the sand pit by hooves. The rest of the assemblies are provided by straight connectors or by nailing.

Lay the tiles

lay the flat tiles of a carport

The battens are nailed to the rafters, in parallel lines respecting the draft of the tile. The adjustable caliper makes it possible to adapt exactly the distance of the battens according to the surface covered. The laying of the tiles does not present any difficulty. The straight banks are first put in place and the elements are placed from left to right. Previously, the end of the rafters is intersected.

Lay the gutter

struts reported on a carport

A nailed edge board hides the ends of the rafters. It also serves as a support for the half-round gutter. Note the reported struts, nailed between the posts and the sandpit.

Connect the collector

manifold connection on a carport gutter

The waters of gutters are led by a descent connected to a look.
The site ends with the trench necessary for the installation of the connecting pipe with the main collector.

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