Gallons Per Square Foot Of Roof

In those instances you need to break the area down into smaller rectangles.

Gallons per square foot of roof.

Take a guess what is the volume of water that runs off a 1 000 square foot roof during a 1 rain storm. With a cedar roof make sure you pre wet the roof down with water first. I am referencing the square footage of the roof with pitch factored in not the floorplan square footage. What about non rectangular areas.

Using a 10 000 sq. For example a 3 inch per hour rainfall will build up to a 3 inch depth on a flat roof in one hour at the rate of 1 87 gallons per hour sq. 6 depth double. So a 50 x 20 roof is 600.

400 square foot roof draining to 1 raingutter downspout. At 12 of depth or 66 sq. The answer is about 623 gallons. Rainwater can be collected from the roofs using the rain water harvesting method.

So with a 5 000 sq. How do i calculate square footage. Code to add this calci to your website. The collectable rainwater from the roof can be calculated in gallons using this calculator based on the rainfall and area.

To calculate the runoff from any given rainfall. 12 depth a basin or dry stream bed that is approximately 6 feet by 6 feet or a dry stream bed that is 3 feet wide x 11 feet long. Roof i use about 50 gallons of mix. Square footage is based on multiplying the length of an area x width of that area.

For instance an l shaped surface can be broken into 2 smaller rectangles see illustration below. Roof area the 3 inch rainfall will produce 18 700 gallons in one hour at the rate of 312 gallons per minute. 248 7 48 33 sq. Conversion between gallon and square feet.

Step 3 multiply the cubic feet by the amount of water per cubic foot which is 7 48 gallons. Use one gallon for every 50 square feet of bonded tar and gravel roof and for every 50 to 75 square feet of rolled roofing. Gallon to square feet calculator. While the amount of primer needed per square foot depends on how porous the current roofing is one gallon of primer covers about 50 to 100 square feet on built up roofs asphalt surfaces and modified bitumen roofs.

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. It is often compared to slope but is not exactly the same. For instance if the pool is 3 feet deep 10 feet wide and 20 feet long you would multiply 3 times the product of 10 times 20 to get 600 cubic feet. Example roof and and design.

400 sq foot roof x 62 248 gallons. Take the dimensions of the footprint of your roof and convert them to inches. Outside of the u s a degree angle is typically used.