# What is a ridge height?

**height**from the top of the plate to the top of the

**ridge Height**from floor to bottom of

**ridge**would be the length of a support under the

**ridge**.

**Height**Above Plate (H.A.P.) is the vertical

**height**of the rafter above the wall top plate. Horizontal Span of Rafter (inches,run)

Consequently, how do you calculate the height of a ridge beam?

**How to Figure the Center Height of Rafters**

- Divide the width of the exterior house frame in inches by two. This provides the run for one side of the roof in inches.
- Multiply the roof pitch by the run factor. The result equals the total distance the roof rises.
- Calculate the top height of the ridge board.

Subsequently, question is, how do you calculate ridge length? A hip roof **ridge** is the width of the structure, plus the thickness of the **ridge**, subtracted from the buildings **length**. To find the **ridge** board **length** you simply measure the **length** of the building, then the width, add the **ridge** thickness to the building width, and subtract this total from the **length**.

Hereof, how tall is a 4/12 truss?

for the top chord lumber. For example: a 33-9-0 (33 ft., 9 in. and zero 16ths) **truss** on a **4/12 pitch** would be 33.75 ft.

What is the difference between a ridge board and a ridge beam?

**Ridge beam** sizing is based on the span of the **beam between** supports, and the amount of roof load supported by the **beam**. A **ridge board** is a non-structural member that serves as a prop for opposing rafters to rest against and connect to. **Ridge boards** can only be used **in** roofs with slopes from 3 **in** 12 up to 12 **in** 12.