Projected Roof Area Definition

How to use projection in a sentence.

Projected roof area definition.

Number of roof. This table is based on zurn s roof drain vertical requirement for horizontal roof areas at various rainfall rates table. 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. Synonym discussion of projection.

This is often used in mechanical engineering and architectural engineering related fields specifically hardness testing axial stress wind pressures and terminal velocity. Projected area is the two dimensional area measurement of a three dimensional object by projecting its shape on to an arbitrary plane. Take the roof s total square footage and divide by the total square footage handled by one drain. 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.

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. From table 1 one 4 leader at 4 rate of rainfall will take care of 3 460 sq. The roof area ra is calculated easily. The result is the number of drains needed.

Total roof area 500 by 200 100 000 sq. After studying building plan and physical arrangement assume that 4 leaders are required for this project. Calculate drains needed. Dead loads also act downward but you need to apply the whole sloped area because that is all actual material with weight.

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. The decorative horizontal molding or projected roof overhang. Roof live loads and snow act downward on the projected area. We multiply the roof length c which is the sum of building length plus the gable end overhangs of the roof by the roof width of slope a that we just figured out above when we computed the hypotenuse of the roof triangle that s why we needed the roof rise number.

Eaves on a sloped roof the horizontal underside that projects out from the house wall. Determine rate of rainfall for this example use 4.