Important nuances in the calculation and installation of the hip roof
Online presentation of a four-slope roof on the video in the adjacent tab:
Any roof installation begins with determining its angle of inclination. Experienced builders know that it is the angle of inclination that affects the long-term operation of the roof and the quality of the walls of the house. Often the angle is set depending on the precipitation of the terrain in which the house is built and, in general, its climatic conditions. In strong winds, it is necessary to calculate the roof, reducing the angle of its inclination. A slight slope will save the load-bearing walls from destruction. In cold regions with heavy snowfall, the angle is sharp, making the ramp more abrupt and allowing the snow to fall faster from the roof surface. In settlements with arid weather - a smooth roof slope serves to eliminate excessive overheating.
The construction material is included in the calculation of the hip roof. By the way, often the material becomes the underlying angle of the roof slope.
Consider:
- Angle of 20-22 degrees is selected for roofing from slate surface
- 3-4 degrees on average - roll soft materials are selected at three layers, 10-15 degrees - in two-layer coatings
- 10-12 degrees - calculation of roof slope from corrugated board
- Types of shingles: metallic - 13-14 degrees, soft -10-11 degrees
- 5 degrees - quality ondulin
- All types of angles can be used, using membrane materials, which do not fixate on the severity of the slope.
It's important to note! The deliberate change in the slope of the roof affects its area and, accordingly, the amount of construction equipment and additional costs.
When calculating the angle, special attention is paid to the central rafters, the basis of the roofing system. In the installation of the hip roof of such rafters, three are required, which are joined together at the edges of the ridge beam. Small in length the rafters are fastened to the corner, and their angle coincides with the intermediate rafters.
Principles for calculating a four-slope roof: the hip area calculator
Having examined the structure of the roof, it is necessary to determine the angle of its inclination. His calculation is calculated by the Pythagorean theorem: the central rafters, the sides of the hip roof and the side of the building wall are the components of an isosceles triangle.
You can follow the step-by-step procedure:
- Set the central rafters
- Put the finished board on the top bandage of the end( this will serve as the horizontal structure of the intermediate rafters and the overhang of the roof).
- Measure the slope of the rafter system using the special calculator formulas: the roof slope 3 to 12 indicates the coefficient of the intermediate rafter 1,031, and the angled rafters = 1, 016.
- The hinged roof calculation follows the Pythagorean theorem
Calculation formulas for a four-slope roof
We offer useful algorithms for calculation of the roof area.
The area of the hip roof depends on the angle of inclination, which directly affects the consumption of material. The beginning of the construction of a four-pitched roof starts with the calculation and purchase of materials. It is important to take care of the insulation of the roof from excessive moisture. Specialists recommend the use of special flooring layers that do not allow water to pass through and consequently eliminate condensation processes. Steam formations can be easily eliminated by taking the place of ventilation.
Special word - roof insulation. Use mineral wool. The material can be stacked:
- Butt
- Overlap
Calculation of the building material for the hipped roof is not performed according to the standard scheme. The roof area calculator is often less than the required amount of materials. The way of laying also plays a role: overlap involves the use of additional elements( valley, contiguity).Most types of roofing are constructed using crates and lumber.
The calculation of a four-slope roof begins with the measurement of the length of its surface. The roof area calculator is based on the total area of two triangular hips and two side trapezoids. We calculate according to the formula:
S = 0.5 ah( a = base, h = height) - calculation of triangular hips,
S = h( a + b) \ 2( b - base, h - height, a - length) -calculation for the trapezoid.
It is important to note, before repairing the hip roof, it is necessary to consult with a specialist and find out the subtleties in calculating the hip angle and calculating the area of the gable roof.
For details, see the online lesson on calculating and installing a hip roof in the adjacent tab