Q:
# How do you make a roof pitch table?

To make a roof pitch table, measure the rise and the run of a roof, and express the rise and the run as a ratio, such as rise:run. Divide the rise by the run, find the tangent inverse, express the tangent inverse as degrees, and repeat for any further rise:run measurements.

Continue ReadingA standard sloping roof has a single rise:run relationship, or pitch, which is a proportion that indicates how many inches the roof rises vertically across the number of inches it spans horizontally. A roof pitch table merely shows the rise:run of roofs that slope at various angles. Standard pitch tables assume a run of 12 inches.

To find a roof's pitch externally, mark a spirit level at 12 inches. Hold the level horizontally, and measure the distance from the roof's sloping surface to the mark on the level. To find a roof's pitch internally, mark a spirit level at 12 inches. Using a ladder, hold the level horizontally to the bottom side of a rafter. Measure the roof's sloping surface to the mark on the level. This is the roof's pitch, or 6:12, for example

Dividing the rise by run yields the tangent 0.5. For the simplest way to obtain the most accurate result, use a scientific calculator to find the inverse tangent. Type 0.5 into the calculator, push the inverse button, and push the Tan button. The result is the slope angle expressed in degrees.

Follow the same steps for any number of rise:run increments. This constitutes a roof pitch table.

Learn more about Carpentry-
Q:
## How do you cut rafters for a framing square?

A: To cut rafters with the help of a framing square, you need to know the pitch of the roof and the roof span, then you need to mark the measurements on the l... Full Answer >Filed Under: -
Q:
## How do you calculate roof rafter length?

A: To calculate the roof rafter length, determine the roof's pitch and the direction in which the rafters rise from the opposite exterior walls till the ridge... Full Answer >Filed Under: -
Q:
## How do you lay out common roof rafters?

A: Laying out a common rafter begins with preparing a detailed roofing plan and obtaining the pitch of the roof. Get the roof span, and make a triangle called... Full Answer >Filed Under: -
Q:
## How do you determine the minimum pitch for your roof?

A: To determine the minimum pitch of a roof, look at the existing roof or the material the roof is made of. Alternatively, consider the type of environment th... Full Answer >Filed Under: