How To Work Out A Cut And Pitched Roof

An angle cut is a very common cut needed for constructing rafters for any roof.

How to work out a cut and pitched roof.

Pitch rise run 1 5 6 25. 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. It is often compared to slope but is not exactly the same.

Measure the vertical distance from roof to level. Extend it upward so it is perpendicular to the level. 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. Move the tape measure along the the roof until it hits the level at exactly the 12 inch mark.

Shingle roofs typically have a life span of 15 30 years while membrane roofs usually last 5 15 years. These roofs have a pitch less than 4 12. Pitched roof designing buildings wiki share your construction industry knowledge. Conventional roofs are the easiest to construct and you can walk on them safely.

Roof pitch is the measurement of a roof s vertical rise divided by its horizontal run. Let s say it is equal to 1 5 m. Use a tape measure to measure the entire width of your building. Calculate the roof pitch as the proportion of rise and run.

Measure the rise of your roof. 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. Hold the 0 mark of the tape measure against the roof. Although ceramic tile roofs are expensive they can have a life span of over 100 years.

Rafter rise run 1 5 6 2 25 36 38 25rafter 38 25 6 18 m. 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. Use a pencil to jot the width down somewhere. They have a pitch ranging from 4 12 to 9 12.

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. There are two basic methods of pitched roof construction.