Non-professional builders unfamiliar with building codes often think that the slope of a corrugated sheet roof is selected only in accordance with the architectural style of the building and the customer's taste. However, this approach is a gross mistake, because the choice of this important indicator is influenced by factors that can be conditionally divided into 2 groups: technical and mechanical. The technical factors that are taken into account when determining the slope of a corrugated sheet roof include the properties of the material itself. Climatic factors include:
When determining the angle of a roof made of corrugated sheets, the snow load is taken into account first. In regions where a lot of snow falls, structures are made with a slope of 20-25 degrees to prevent the formation of a snow cap on the surface of the slopes.
An important factor that is taken into account in the process of designing a roof structure is the amount of rainfall. The more precipitation falls in the construction region, the steeper the roof slope is made.
The slope of the corrugated sheet slopes is also affected by the wind load. If strong, gusty winds blow in the construction region, the roof is made flatter to reduce the windage of the structure.
Minimum slope of roofs made of corrugated sheetsRecommended slopes for different roofing materials
Important! When determining the roof slope, the most important factors are the recommendations of the roofing material manufacturer and the climatic conditions in the construction area. After this, a design project is created that reflects the composition, section and mutual arrangement of the rafter system elements.
Minimum slope
According to building codes, the minimum permitted roof slope for corrugated sheets is 8 degrees, provided that solid or frequent sheathing is installed. However, experienced roofers claim that, subject to certain special conditions, this material can be laid on flatter slopes. If the roof slope is less than recommended, the overlap between the sheets increases, and horizontal and vertical joints are treated with silicone sealant. There are 3 types of corrugated sheet roofs:
Low-slope. If the roof slope angle made of bangladesh mobile database sheet is less than 14 degrees, to improve the waterproofing properties of the coating, the horizontal and vertical overlap is increased to 20 cm, frequent or continuous sheathing is made, and membrane material is used to protect the rafters from moisture. Each sheet of material overlaps the previous one by 3 waves, which reduces the useful area of the material, increasing consumption.
Medium-slope. If the roof slope is 15-30 degrees, then the overlap between the sheets of corrugated sheeting is 15-20 cm, which corresponds to 1-2 waves. Such a slope of the slopes allows you to save money on roofing work due to the increase in the useful area of the sheet.
Steep-slope. If the roof slope exceeds 30 degrees, a minimum overlap of 10-15 cm, corresponding to 1 wave of material, is allowed when installing corrugated sheets. In this case, lattice sheathing with a pitch of up to 25 cm can be used for the flooring.
Determining the angle of inclinationOptions for using corrugated sheets
Please note that when laying profiled sheets, a clear pattern can be observed: the smaller the angle of the slopes of the structure, the greater the overlap between the sheets is required to protect the roof from leaks at the joints and the material being torn off by gusts of wind.