Algorithm for constructing a single-pitched rafter frame:

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No less often than the previous example, the task of constructing an extension to an existing building arises. For quite understandable reasons, the roof will be single-pitched. It will fit perfectly into any architectural and landscape conditions, and will not create a threat of precipitation accumulation.

The rafter system is constructed at an angle of 20º, since metal tiles will be installed on top of it. The rafters will rest on the main wall and the opposite brick wall of the extension. In the example of a single-pitched structure we have proposed, it is necessary to cover a span of 4.75 m, which is more than 3.5 m. This means that braces will greece mobile database to be installed to ensure rigidity. The design and installation of braces are carried out with the condition that their angle of inclination should not exceed 45º.

The section of the board for making rafter legs is 50x200mm. They will be installed every 70cm. We will make the braces from a 50x150mm board, and for the construction of the lathing we will stock up on a 25x100mm board.

We install a 100×150mm beam flush with the inner plane of the extension wall, not forgetting to lay waterproofing beforehand. We fix the beam with bolts every 80-100mm.
In the main wall at the planned height we gouge out grooves for installing the upper heels of the rafters. The depth of the grooves is 12 cm, the width is slightly larger than the thickness of the board, the step is 70 cm. Instead of gouged out grooves, you can use metal brackets that are simply screwed to the wall. In shape, they resemble an inverted letter "P", in which the upper edge of the rafter is located.
Let's make a template for the rafter legs. We put a 50x200mm board to the place intended for it and mark the cuts on both edges. The depth of the upper cut, necessary for installing the rafter in the groove, is 10 cm. It is not necessary to make it deeper, otherwise the rafter will rest against the wall, and this is undesirable. We transfer the dimensions of the upper cut to the bottom. At the same time, we mark the vertical line of the cut along the width of the cornice.
Using the template, we make all the rafter legs and install them in their proper places. For fastening at the top, we use metal corners, one side of which is screwed to the wall, the second to the rafter. At the bottom, we fix them with corners or brackets.
We try on a piece of board to the main wall and one of the rafter legs to determine the point of cutting the groove for the brace. Do not forget that the angle between the wall and the brace should not exceed 45º, and the lower heel of the brace should rest against the wall 20-30 cm below the opposite wall.