What is Commercial Roofing?

A flat roof is a slope of less than 5% (2.86 degrees).

Flat roof

Right!

A flat roof is a slope of less than 5% (2.86 degrees).

The division of sloping roofs and flat roofs is determined by the slope. Flat roofs are not absolutely flat, and they have slopes, but they are very small, otherwise the area water cannot be discharged. At present, there is no strict definition of regulations. The waterproofing industry believes that slopes greater than 10% (5 ° 48 ') are slope roofs. Flat roofs with a slope of less than 5% (2 ° 54 ').

Chinese name: Flat roof

Foreign name: plane roof

Why the slope definition is greater than 10%, because the 10% slope can be used for structural waterproofing, using metal sheet. If the slope is less than 10%, the structure cannot be waterproof, and it can only be fully enclosed and waterproof. If you use small tiles to waterproof,

(1) Roofing area; leveling layer; insulation layer; roofing coil waterproofing; iron sheet; UPVC rain bucket; cast iron drain UPVC elbow; drain pipe.

Calculation method of flat roof

Roof area

The tile roof and profile roof (including the eaves part) are calculated by designing the horizontal projection area of the design size by the roof slope coefficient (see the roof slope coefficient table) to calculate the slope area.

Do not deduct the area occupied by chimneys, hood bases, air ducts, small transoms and diagonal trenches.

The area of the overlapping part of the small eaves of the roof and the roof does not increase, but the area of the overlapping part of the eaves of the skylight is included in the corresponding roofing work.

The work and materials of the tile roof, such as the exit of the roof, covering with water, plastering a little, and ridge tiles and gills, are not calculated separately.

Roof waterproof area

The waterproofing of roofing coils and the waterproofing of roofing coatings are calculated in square meters according to the design size and area.

Sloping roof (excluding flat roof to find slope) multiplies the horizontal projected area according to the size shown in the figure by the roof slope extension factor. The sloped area is calculated in square meters. The flat roof is calculated in the horizontal projected area. The slope is prolonged due to flooding of the roof. Don't think otherwise.

The area occupied by chimneys, hood bases, air ducts, small air windows and diagonal ditches on the house is not deducted, and the curved part of the root is not calculated separately.

The curved parts of the roof's daughter walls, expansion joints, skylights, etc., are incorporated into the roofing amount. The overlapping area of the skylight eaves shall be calculated in square meters according to the dimensions shown in the figure and incorporated into the coiled roofing project. As shown in the figure, dimensions are not specified. Expansion joints and daughter walls can be calculated as 625px. Skylights are calculated as 1250px.

The calculation of the amount of coating film roof is the same as that of coiled roof. Paste caulks, glass cloth cover seams, and roof divider seams for filmed roofs are calculated in extended meters.

(3) The amount of cement mortar screed for roofing is the same as that of coiled roofing.

The engineering amount of roof insulation layer is the same as that of coiled roof.

The amount of iron sheet, UPVC rainwater bucket, cast iron drain, cast iron, UPVC elbow, short pipe, and lead wire ball are calculated on the roof.

The roof drainage pipe is calculated according to the design diagram size and the expanded length. If the design is not dimensioned, the lower part of the cornice is counted to 375px above the design outdoor ground level, and the lower end connected to the cast iron elbow is counted to the joint.