Projected Roof Area Definition

Take the roof s total square footage and divide by the total square footage handled by one drain.

Projected roof area definition.

The above sizing data is offered as a guide only. The decorative horizontal molding or projected roof overhang. Synonym discussion of projection. From table 1 one 4 leader at 4 rate of rainfall will take care of 3 460 sq.

Projected area is the two dimensional area measurement of a three dimensional object by projecting its shape on to an arbitrary plane. This is often used in mechanical engineering and architectural engineering related fields specifically hardness testing axial stress wind pressures and terminal velocity. Roof live loads and snow act downward on the projected area. Dead loads also act downward but you need to apply the whole sloped area because that is all actual material with weight.

The result is the number of drains needed. The roof area ra is calculated easily. In sizing roof drains and storm drainage piping one half of the area of any vertical wall that diverts rainwater to the roof shall be added to the projected roof area for inclusion in calculating the required size of vertical conductors leaders and horizontal storm drainage piping. Formed metal sheeting secured on or into a wall curb pipe rooftop unit or other surface to cover and protect the upper edge of the membrane base flashing or underlying metal flashing and associated fasteners from exposure to the weather.

After studying building plan and physical arrangement assume that 4 leaders are required for this project. If you ve got a 45 degree roof with 10 of rise and 10 of run on the rafters you would apply plf weight 2 sqrt 2 on the horizontal projected area. This table is based on zurn s roof drain vertical requirement for horizontal roof areas at various rainfall rates table. Total roof area 500 by 200 100 000 sq.

Number of roof. An l shaped metal strip positioned along a roof s edges to allow water to run off the roof without running down the eaves or siding. Example of a projected area from a hardness indentation. Eaves on a sloped roof the horizontal underside that projects out from the house wall.

Calculate drains needed. Projection definition is a systematic presentation of intersecting coordinate lines on a flat surface upon which features from a curved surface as of the earth or the celestial sphere may be mapped.