Gable roof system

How to make a rafter system of a gable roofTable of contents:

  • 1 Gable Roof Models
  • 2 Angle value
  • 3 Rafter systems
  • 4 Calculation of materials
  • 5 Installation of the rafter system
  • 6 videos

Gable roof thanks to a simple, reliable and presentable Designs have been popular for many years. Depending on size slope of slopes, it is used in regions with different numbers precipitation. The gable roof system provides natural precipitation.

Gable Roof Models

Gable Roof Models

  1. Symmetric – both slopes are the same length and are mounted at one angle. Such a roof is an isosceles triangle with an obtuse or sharp angle.
  2. A sloping roof is created to accommodate the attic room, its rafter system implies a complex, two-level design.
  3. Different angles of slopes – this is an original design, emphasizing the unusual architecture of the house.

Broken gable roof (attic)Broken line gable roof (attic)

Angle value

The angle of inclination is selected after analysis of several indicators: type of roofing, rainfall, wind load. For regions with heavy rainfall, a small angle is recommended. rays, but not less than 5 degrees. On a steep surface, do not snow masses are delayed. Flat roofs with a blunt slope angle Suitable for windy climates.

Tilt angleTilt angle

The gable roof system must comply accepted safety standards and be built in accordance with standards.

Rafter systems

The rafters of a sloping roofHead rafters sloping roof

Bearing elements and rafters take the load from external forces and redistribute it to the walls of the building. From their reliability the strength of the entire roof depends. In the construction of the structure use two rafter systems:

  • Hanging – rafter legs have two fulcrum on the walls building. They are under compression and bending. At a distance a span exceeding 8 meters, installation of a headstock with struts. To reduce the impact of rafters on the walls of the building, their connect by puff.
  • Slats – these bars are supported on the inner wall or special design.

The roof rafters gableHairy gable roof rafters

If it is impossible to use one of the systems in their pure form, resort to a hybrid design that allows you to alternate hanging and rafters.

Material calculation

The device of the gable roof truss system allows carry out calculations yourself, based on knowledge of geometry. For calculating the construction area you need to set the length of the ramp. The amount of material required depends on the angle of inclination. Acute the angle allows you to save money, but the attic is minimized space.

The height of the ridge, the length of the rafters and the roof area are calculated with using geometric formulas. Suitable for clarity scheme of the house. Example – let’s take a slope angle in 45 degrees, the width of the house (base of an isosceles triangle) – 6 m, length – 10 m.

Calculation of materials

First, divide the triangle in half with the height dropped from the top angle. It turns out two right triangles, and one of their legs – desired roof height. Height divides isosceles triangle in half, then one leg is 3 m. The second is calculated by the formula:

3 × tg 450 = 3 m.

Knowing the legs, according to the Pythagorean theorem, we calculate the hypotenuse, which is a rafter:

32 + 32 = X2.

The length of the rafters will equal the square root of 18, approximately 4, 25

The number of rafters is calculated by dividing the total length by a step (0.6 m):

10: 0.6 = 16.6 – this value needs to be doubled.

We calculate the area by multiplying the length of the ramp and the house and, multiplying value at 2:

4.25 × 10 × 2 = 85 m2.

Using various formulas, you can calculate the necessary amount of materials.

Installation of the rafter system

Installation of the rafter system

The bearing base for the roof is Mauerlat – a solid beam section 150 × 150 mm from processed conifers. His fastening is carried out on an anchor, immured in the upper row masonry. They should be 2-3 cm above the beam to provide a place for tightening the nut. Under the Mauerlat a layer of roofing material for protection against moisture. Between the walls transverse beam fastening the Mauerlat and protecting from longitudinal loads. To maintain the ridge, a special beam is laid along stingray – lying, with a section equal to Mauerlat. With significant the width of the building requires the installation of runs.

Attaching rafters to MauerlatAttaching rafters to Mauerlatu

The cross section of the rafters is determined by the pitch and length of the rafter element, usually a board 50 × 150 mm. Rafter trusses easier collect on the ground and ready to serve on the roof. For the template are taken two boards, equal in length to the rafters, and are connected by a nail. The free ends are laid on the supports, the resulting angle is fixed crossbar. The places and the shape of the cuts are marked with the help of the second template made of plywood. Bars are fastened under the desired angle with bolts, cuts are made on them, and after the farm they raise upstairs for installation.

Methods of fastening a ridge beamMounting Methods ridge beam

The first installed rafters on the gables. To Mauerlat they fastened with the help of corners or brackets. The first farms are exhibited strictly in level. Between them stretches a cord, which is reference point for installing the rest of the elements.

To give sufficient rigidity to the entire structure to braces and crossbars are attached to the rafter leg. Skating run bolted to each truss truss. This connecting the element must be made of a solid bar.

Rigid fastening of the ridge beamHard mount ridge beam

With a significant width of the building, installation of runs is necessary, it is a horizontal beam measuring 50 × 150 mm, supporting rafters. For its installation, vertical racks are installed, leaning on a lay. These elements will become the basis of the framework for attic space.

To avoid water dripping onto the walls, it is necessary to provide overhang, for this rafters make hanging 30 cm or attach additional boards of “filly”.

Mounting of fillyMounting filly

On the finished rafters, a crate is packed, for each the desired step is selected for the roofing material for the shingles continuous flooring is in progress. Roof insulation is an important part construction. You can minimize heat loss, competently laying insulation. For this, basalt wool is taken, width material is equal to the step between the rafters, which allows you to quickly and Reliably carry out insulation. Provide reliable roof protection against moisture will help laying waterproofing.

Basalt wool insulation schemeInsulation scheme basalt wool

The symmetrical gable roof model is the easiest to erection and reliable operation option. Load in the rafter system is distributed evenly, which allows extend the service life of the structure. Visual video tutorials will help master the intricacies of work.


This video explains how to build a rafter system. gable roof:

In this video you can see the rafter system on example of one gable roof:

Read also:

Dormer roof

DIY flat roof

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