Projected Roof Area Definition

The above sizing data is offered as a guide only.

Projected roof area definition. Take the roof s total square footage and divide by the total square footage handled by one drain. From table 1 one 4 leader at 4 rate of rainfall will take care of 3 460 sq. Eaves on a sloped roof the horizontal underside that projects out from the house wall. Example of a projected area from a hardness indentation.

Projected area is the two dimensional area measurement of a three dimensional object by projecting its shape on to an arbitrary plane. 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. Synonym discussion of projection. The roof area ra is calculated easily.

The decorative horizontal molding or projected roof overhang. 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. 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. After studying building plan and physical arrangement assume that 4 leaders are required for this project.

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. 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. Number of roof. How to use projection in a sentence.

Roof live loads and snow act downward on the projected area. Determine rate of rainfall for this example use 4. Dead loads also act downward but you need to apply the whole sloped area because that is all actual material with weight. Calculate drains needed.

This table is based on zurn s roof drain vertical requirement for horizontal roof areas at various rainfall rates table. The result is the number of drains needed.