Gallons Per Square Foot Of Roof

For instance an l shaped surface can be broken into 2 smaller rectangles see illustration below.

Gallons per square foot of roof.

At 12 of depth or 66 sq. 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. In those instances you need to break the area down into smaller rectangles. So a 50 x 20 roof is 600.

400 square foot roof draining to 1 raingutter downspout. 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. For instance a 7 12 roof pitch means that the roof rises 7 inches for every 12 horizontal inches. Example roof and and design.

So with a 5 000 sq. 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. Take a guess what is the volume of water that runs off a 1 000 square foot roof during a 1 rain storm. Roof area the 3 inch rainfall will produce 18 700 gallons in one hour at the rate of 312 gallons per minute.

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. Code to add this calci to your website. What about non rectangular areas. With a cedar roof make sure you pre wet the roof down with water first.

Or 0312 gallons per minute sq. Conversion between gallon and square feet. 6 depth double. To calculate the runoff from any given rainfall.

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. However a good starting point in my experience is 1 gallon of roof mix covers 100 sq. Roof i use about 50 gallons of mix. Rainwater can be collected from the roofs using the rain water harvesting method.

It is often compared to slope but is not exactly the same. Square footage is based on multiplying the length of an area x width of that area. Take the dimensions of the footprint of your roof and convert them to inches. How do i calculate square footage.

The answer is about 623 gallons. Step 3 multiply the cubic feet by the amount of water per cubic foot which is 7 48 gallons. 248 7 48 33 sq. 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.

I am referencing the square footage of the roof with pitch factored in not the floorplan square footage. Using a 10 000 sq. The collectable rainwater from the roof can be calculated in gallons using this calculator based on the rainfall and area.