Online calculator for calculating a lean-to roof, slope angle and number of roof battens

Information on the purpose of the calculator

The online single-pitched roof calculator is designed to calculate the slope angle, quantity and size rafters, the number of crates, as well as the volume of necessary materials. The calculations take into account all popular roofing materials such as ceramic, cement-sand, bitumen and metal tiles, ondulin, slate, etc. It is possible to calculate a flat roof according to the specified parameters. The calculation is accompanied by drawings in different projections, and a drawing of the rafters with the dimensions of the lower saw.

The single-pitched roof is the simplest among other types of roofs and economical in terms of consumption of materials and works, as it has only one ramp. This type of roof is quite popular and mostly it is used for garages, outbuildings and other non-residential premises. It can be both attic and heartless.

For this roof, almost all popular types of roofing, under-roofing are applicable materials and insulation materials. Various slope angles are applicable to this type of roof, but most often small angles are used. In this case, it is necessary to take into account the increased snow loads on the roof and clean it from snow in a timely manner.

The following is a complete list of calculations performed with a brief description of each item.

General information on the results of calculations

• Roof tilt angle
- Angle of slope and rafters. The program will also tell you whether this angle is suitable for the selected roofing material. To increase or decrease, change the parameters of the base width or height lifting.
• Roof surface area
- The total area of the entire roof surface, taking into account the length of the overhang. Corresponds to the amount needed roofing and under-roofing material
• Approximate peak load per 1m2 of roof
- Load per 1 square meter of the truss system, taking into account snow, wind load, as well as taking into account the slope angle, the weight of the roofing material, the weight of the crate, counter-crate, rafters and insulation
• Roof weight excluding climatic loads
- Includes the weight of roofing material, crates, counter-crates, rafters and insulation. By default, the bulk density of lumber is 600 kg/m3, and the density of insulation is 35 kg/m3
• Roof weight taking into account climatic loads
- Includes the weight of roofing material, crates, counter-crates, rafters and insulation, as well as snow and wind load in the peak, taking into account the slope angle
• Length of rafters
- The length of the rafters from the ridge to the base of the ramp
• Safety margin
- The margin of safety of a suitable section of the rafters, depending on the minimum section.
• Minimum section of rafters
- The calculated cross-section of the rafters, taking into account the selected parameters and loads.
• Number of rafters
- The total number of rafters at a given step for the entire rafter system.
• Number of rows of crates and counter-crates
- The total number of rows of crates and counter-crates according to the specified dimensions for the entire roof
• Number of rolls of steam-waterproofing with overlap
- The number of whole rolls of steam-hydro insulation, taking into account overlap. The overlap value is calculated automatically depending on the slope angle.