Calculating Hip and Jack Rafters

This video tutorial covers the process of framing a hip roof using a framing square and a calculator. It begins with an introduction to the components of a hip roof, including common, hip, and jack rafters. The tutorial provides a detailed explanation of calculating and cutting common rafters, followed by a transition to hip rafters. It explains how to use a construction calculator to determine the necessary measurements and demonstrates the layout and cutting process for both common and hip rafters. The video concludes with instructions on laying out and cutting jack rafters and assembling the roof structure.

What are the two essential numbers needed to calculate common rafters using a construction calculator?

• Span and thickness

• Run and pitch

• Height and width

• Length and angle

What is the diagonal measurement of the common rafter in the example provided?

• 23 and a quarter inches

• 8 and an eighth inches

• 34 and seven-eighths inches

• 26 inches

What is the purpose of the birdsmouth cut in a common rafter?

• To reduce the rafter length

• To adjust the pitch

• To fit the rafter onto the wall plate

• To extend the overhang

How do you determine where the hip roof starts in relation to the common roof?

• By checking the ridge board

• By using the run measurement

• By calculating the pitch

• By measuring the total span

What adjustment is made to the framing square when laying out hip rafters?

• Change the pitch to 12 inches

• Adjust the run to 17 inches

• Decrease the angle to 30 degrees

• Increase the thickness by 1 inch

What is the purpose of the double bevel cut on a hip rafter?

• To adjust the pitch

• To reduce the rafter width

• To fit tightly into the ridge space

• To increase the rafter length

How is the overhang amount determined for a hip rafter?

• By adjusting the ridge board length

• By measuring directly from the fascia

• By using the common rafter overhang and pitch

• By calculating the total span

What is the height above plate measurement used for in hip rafters?

• To determine the rafter length

• To calculate the pitch

• To set the seat cut height

• To adjust the ridge board

Why is it necessary to account for the thickness of the hip when calculating jack rafters?

• To maintain the correct pitch

• To ensure the rafters are parallel

• To adjust the length of the ridge board

• To achieve the correct on-center spacing

What is the final step in ensuring jack rafters fit correctly?

• Increasing the rafter length

• Mirroring the cuts

• Reducing the thickness

• Adjusting the pitch