Extensions to the house can have different parameters,

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The Mauerlat is made from a beam with a cross-section of at least 100×150 mm. The part should not move closer than 50 mm to the outer edge. The element is fastened to studs embedded in the masonry in advance. If the structure is made of wood, the function of the Mauerlat is performed by the upper crown of the walls.
It is best to prepare a template of the appropriate length for the rafters in advance. Moreover, it is desirable that the timber initially be slightly larger (by 50-100 mm from each edge) than the planned length. The required overhang of the eaves is formed after the installation of the rafters, cutting off the excess edges. Usually, roof overhangs are made within 400-500 mm on each side.
Along the entire length of the mauerlat, markings are made for notching for rafters. The step between them is in accordance with the project. The wood sample is made to a depth not exceeding 1/3 of the timber thickness.

The manufactured rafters are installed in their places greece mobile database connected to the wall plate in the chosen way (nails, staples, corners, etc.).
Once installation is complete, the rafters are trimmed to the required length and covered with a nailed wind board.
There are two methods that can be used to form roof overhangs in front and behind the garage.
The Mauerlat is extended to the required length beyond the walls of the building.
Additional elements – fillies – are attached to the outer rafters.

and with a span width of less than 4000 mm, a classic scheme with rafter support on two bearing points can be used. However, with wider buildings (˃4000 mm), it will be necessary to install braces that rest against the wall of the building.

A mauerlat made of 100×150 mm timber is laid on the outer wall of the extension. The part is fastened using the selected method (on studs, anchors); in a wooden structure, the part is not mounted using the upper crown of the wall as a support for the rafters.
In the opposite wall of the house, for the rafters, it is necessary to prepare nests for the size of the rafter in the thickness of the wall (such grooves can be made at the stage of laying).