Finding The Roof Span Based On Line Length

This is based upon the span of the rafter horizontal span not total rafter length live and dead loads.

Finding the roof span based on line length. For example if the roof rises 4 feet and the span is 16 feet twice the run then the pitch is 4 16 or 1 4. Roof base length width how roof pitch is calculated. Trying to find what size lumber to use. Shingle roofs typically have a life span of 15 30 years while membrane roofs usually last 5 15 years.

This rafter span calculator is species specific for douglas fir hemlock etc. It is often compared to slope but is not exactly the same. I want to open up the space so i need to span answered by a verified structural engineer. Pitch is the incline of the roof represented as the ratio of rise to the span twice the run.

Although ceramic tile roofs are expensive they can have a life span of over 100 years. The roof beams are running in line with the length of the building. To size joists and rafters use the maximum span tables for southern yellow pine. Thus a moderate 6 in 12 roof pitch means that the roof rises 6 inches vertically for every 12.

Calculate the length of common rafters with this free and easy online tool by entering a dimension for the roof width selecting a pitch for the roof and the thickness of the ridge. A roof s pitch is determined by how much it rises vertically for every foot it runs horizontally. The length of the rafter. More roof calculators roof truss calculator.

Roof pitch is the measurement of a roof s vertical rise divided by its horizontal run. It is the length of this portion of the rafter. The results are automatically fired. The run of the rafter.

Height of the scaffold. If you plan to have overhang etc. The rise of the rafter.