How To Work Out Roof Area For Soakaway

So get your tape measure out and calculate the total surface area in square metres.

How to work out roof area for soakaway.

The two determining factors for soakaway success are the size of the area or volume of water to be drained and the percolation rate of the soil sub soil or in some sites the depth to the water table. To work out what size of soakaway is required you firstly need to calculate the area of the roof that will discharge into the soakaway. Write this figure down on a notepad. Calculating the roof area.

Okay that s the roof bit out of the way. Measure the length of the roof from one end to the other along the eaves. How to quickly test if a soakaway will work. And one cubic metre is suitable for 50 square metres of surface area.

For example 50m2 roof area requires a rubble filled soakaway of 50m 2 x 50 3000 0 3 2 8m 3. With the above information it is possible to work out how much insulation you may need how many roof vents you ll need to install and how many. One of the first things to consider when choosing a site for a soakaway is the water table aka saturation line. If you have several different surface areas connecting to the same soakaway roof gutter conservatory patio.

It affects walkability as well as drainage and roofs in areas of high rain or snowfall tend to have steeper pitches. Depending whether the roof area is measured horizontally. 30 m2 roof area x pitch angle factor 1 5 45 m2. You need to calculate the whole impermeable area roof size patio size driveway size etc as well as perform percolation tests to determine the permeability of the ground around the property.

To calculate the size volume of a rubble filled soakaway the same calculation can be used but the result divided by 0 3. Because this is only one half of the roof we will need to double this number to find the entire roof area 121 45m. 8 7m x 6 98m 60 73m. Roof pitch affects the actual area of the roof.

So for our example the half roof area is as follows. This is calculated as follows. Roof pitch is a determining factor for cost of the roof as well as the roof area and the type of materials used.