Gallons Per Square Foot Of Roof

The load increases with the use of heavier roofing material.

Gallons per square foot of roof.

2 every square foot of roof space collects 6 gallons of water in a 1 inch rainfall. To figure out the square footage of a surface multiply the width x length. Conversion between gallon and square feet. Take the dimensions of the footprint of your roof and convert them to inches.

Permeable area needed to absorb the rainwater. Outside of the u s a degree angle is typically used. 1 us gallon 231 cubic inches. Where rainfall rate is expressed in inches per hour and roof area is given in square feet.

To a depth of 1 in 1 hour. Of water in a gallon 0 623 gallons per hour. 1 inch of rainfall in an hour will cover 1 sq ft. 3 to account for losses and inefficiency you can expect to collect about 75 of the actual rainfall so your calculation should be multiplied by 75.

It is often compared to slope but is not exactly the same. Converting this to gallons per minute per square foot gpm ft 2. The answer is about 623 gallons. In the united states a run of 12 inches 1 foot is used and pitch is measured as the rise of the roof over 12 inches.

The square footage of a roof is the same whether it is pitched or flat. One gallon covers 80 square feet of corrugated metal roof and 100 square feet of smooth metal roof. For example on a 2 000 square foot roof you can collect 2 000 x 0 56 1 120 gallons inch of rain. Meaning you can capture about 62 gallons per sq ft.

Gallon to square feet calculator. To calculate the runoff from any given rainfall. In this example 600 x 240 x 1 144 000 cubic inches of water divide by 231 to get the number of gallons because 1 gallon 231 cubic inches. Multiply the cubic feet by the amount of water per cubic foot which is 7 48 gallons.

A clay tiled roof may have a dead. If you have a foam or modified bitumen concrete built up or bonded tar and gravel roof you need one gallon for every 50 square feet of roof surface. In this example you would multiply 7 48 times 600 to get 4 488 gallons of water. The dead load of a typical asphalt shingled wood framed roof is about 15 pounds per square foot.

Of water 231 sq in. Usgs cascades volcano observatory vancouver washington.