How To Work Out A Cut And Pitched Roof

Pitch rise run 1 5 6 25.

How to work out a cut and pitched roof.

Shingle roofs typically have a life span of 15 30 years while membrane roofs usually last 5 15 years. Roof pitch is the measurement of a roof s vertical rise divided by its horizontal run. Use a tape measure to measure the entire width of your building. Move the tape measure along the the roof until it hits the level at exactly the 12 inch mark.

Extend it upward so it is perpendicular to the level. It is often compared to slope but is not exactly the same. A cut roof this is the traditional method of cutting the timber on site and building up the roof using rafters ridge boards joists and purlins etc the exact details being determined by the size of roof size of timbers etc. Measure as precisely as possible down to the 1 4 inch 0 64 cm 1 8 inch 0 32 cm or 1 16 inch 0 16 cm.

These roofs have a pitch less than 4 12. A pitched roof is a roof that slopes downwards typically in two parts at an angle from a central ridge but sometimes in one part from one edge to another. Use a pencil to jot the width down somewhere. Although ceramic tile roofs are expensive they can have a life span of over 100 years.

Measure the vertical distance from roof to level. An angle cut is a very common cut needed for constructing rafters for any roof. Knowing how to make this calculation will make your roof construction project easier and will ensure the safety and success of your roofing project once completed. For example the width of the building may be 72 75 inches 184 8 cm.

Hold the 0 mark of the tape measure against the roof. Calculate the roof pitch as the proportion of rise and run. The pitch of a roof is its vertical rise divided by its horizontal span and is a measure of its steepness. There are two basic methods of pitched roof construction.

Rafter rise run 1 5 6 2 25 36 38 25rafter 38 25 6 18 m. Conventional roofs are the easiest to construct and you can walk on them safely. You can also calculate roof pitch even without using a roof slope calculator. They have a pitch ranging from 4 12 to 9 12.

High pitched roofs often need extra fasteners and their pitch can be as high as 21 12. Calculate the rafter length substituting these values into the following formula.