Hip roof: the main rules of construction

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The main features of hip roofs

08 Hip roofs -Figure 1

The design of hip roofs has two sides:

  1. The longest slopes have the trapezium shape
  2. The shorter ones are triangles.

08 Hip roofs - Picture 2

The basis of the hip roof is the rafters. They can be:

  • Central
  • Diagonal
  • Corner or external

08 Hip roofs - Picture 3

Long-term operation of the roof and reliable protection of the house from strong gusts of wind and heavy rainfall depends on the angle of its inclination. In turn, the bevel is directly proportional to the climate of the area. Before you start building a roof you need to know about:

  • Precipitation amount
  • Air flow strength
  • Building material for roofing system installation

The above mentioned indices will indicate the height of the roof and the angle of inclination you can orient to the developers.

08 Hip roofs - Picture 4

It's important to note! Self-sufficiency in hip roof calculations is welcomed in case of installation by a specialist. In the remaining moments, a thorough consultation with a professional is necessary. You can calculate the area of ​​the hip roof in the computer program for the design of construction sites.

Design of the roofing roof truss system

The above image of the hip roof design shows the tetrahedral structure. The standard slopes are refined by the second pair of skates, making the design more functional and aesthetic.

The scheme of the structure of the hip roof is made by a scribing rod using the Pythagorean theorem.

08 Hip roofs - Picture 5

Design implies execution of rules:

  1. Intermediate components have a steeper slope. Their installation involves the use of boards 5/15 centimeters
  2. Short details are screwed to the corners of the rafters, not to the ridge elements
  3. It is better to use the same materials for the skeleton and ridge parts
  4. Central rafters are mounted to the ends of the ridge boards
  5. The central rafters must be firmly pressed against the ridge board and fastenedto the upper end of the

strapping. Example in the photo.

08 Hip roofs -Figure 6

Classification of four-sloped hip roofs

Distinguish:

  • Tent roof - it has four monotonous rails in design, the same angles
  • Semi-hull - the length of the hips does not reach the roof edges, covering the top half of the roof slope
  • Broken - different slope of the ramps, different length. Its construction is a very laborious process.

08 Hip roofs - Picture 7

Instruction for the design of a gable roof

The basic principle for installing a hip roof is to know the rules for calculating its area and not to disregard the recommendations of professionals.

Some principles:

  • The main supporting structure is the skate, it should be in the center of the roof structure.
  • Diagonal rafters take over all wind loads. Diagonal rafters should be made of thick, thick boards, one end should be mounted in the hobby, the second - go beyond the boundaries of the house.
  • The central frame is located from the edges of the ridge and opens onto the walls.
  • The intermediate frame is mounted on the base of the ramp.
  • Non-long rafters are mounted at the same angle.

Additional points:

  1. Before starting the construction of the hip roof, you need to make an axis marking from the end of the house.
  2. Next, the width of the ridge board and the placement of the main element in the rafter system are determined.
  3. To the withdrawn line attach the measuring rod with one edge, the second - on the side wall line, the location of the intermediate rafters.
  4. The length of the roof overhang is the length of the end of the beam to the overhang of the roof and the length of the timber on the outer corner of the wall.

A more complete visual overview can be obtained by viewing the video in the adjacent tab:

Calculation formula for the hip roof plan

We operate according to the scheme:

  • The design of the intermediate rafters is determined by the measuring rod. From the data table we find the result and select the slope of the roof.
  • Determine the length of the rafters from attaching the support to the ridge board.
  • In the same scheme we measure the length of the overhang. It is desirable to use the formula of the Pythagorean theorem: the square of the hypotenuse is equal to the sum of the square of the legs.

The rafter is measured according to the scheme:

  1. Measured rafters
  2. The result obtained by the Pythagorean formula can be used as the projection value
  3. We multiply the resulting digit by the correction factor. The data will be the length of the angled rafters

. See the video in the next tab in detail:

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