How To Frame A Hip Roof - Including A Common Rafter Review

Summary

This instructional video teaches viewers how to frame a hip roof using a framing square and a calculator. It covers the process of calculating and installing common rafters, as well as the layout and cutting of hip and jack rafters. The video provides a quick method for calculating common rafters using the run and pitch, and demonstrates how to use a framing square for precise cuts. It also explains the adjustments needed for hip rafters due to their 45-degree angle and how to calculate jack rafter lengths, ensuring a snug fit for all roof components.

Takeaways

• 🏠 Framing a hip roof involves using common rafters, hip rafters, and jack rafters.
• 📏 A framing square and a calculator are essential tools for calculating and laying out the roof components.
• 📐 The 'run' is calculated as half the total span minus half the thickness of the ridge material.
• 📈 The 'pitch' is the roof's rise per 12 inches of run, determined by personal preference or design specifications.
• 🔢 For common rafters, use the construction calculator to input the run and pitch to find the diagonal measurement.
• 📝 Layout for common rafters includes marking for the birdsmouth, soffit, and fascia cuts using a framing square.
• 👑 The 'king common rafter' is the first common rafter installed, which aligns with the ridge and center line on the plate.
• 🔄 The hip roof starts a specific distance back from the building's edge, which is the run measurement.
• 🛠️ Hip rafters have a different run measurement (17 inches instead of 12) due to their angle to the ridge board.
• ✂️ Jack rafters are shorter and have a 45-degree bevel at the top, with a common rafter seat cut and tail assembly.
• 🏁 The process requires careful measurement and cutting, with adjustments for overhangs and the thickness of materials.

Q & A

What are the main components of a hip roof?

A hip roof is composed of common rafters, hip rafters, and jack rafters.

What is the purpose of calculating the common rafters before framing a hip roof?

Calculating and installing common rafters is essential as they form the base structure of the hip roof, and the hip rafters and jack rafters are positioned relative to them.

What two measurements are required to calculate common rafters using a construction calculator?

The two measurements needed are the run and the pitch. The run is half the distance of the total span minus half the thickness of the ridge material, while the pitch is the roof's rise per 12 inches of run.

How is the run calculated for the common rafters?

The run is calculated as half the total span of the roof minus half the thickness of the ridge material.

What does the pitch represent in the context of framing a hip roof?

The pitch represents how much the roof rises per 12 inches of horizontal run, which is dependent on personal preference, codes, or designer specifications.

How do you use a framing square to layout a common rafter?

To layout a common rafter with a framing square, align the pitch mark on the tongue side with the edge of the wood, then align the 12-inch mark on the other side, clamp it in place, and trace the tongue angle at the top of the rafter.

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

The birdsmouth cut in the rafter is designed to allow the rafter to sit on the top plate of the wall and provide support for the roof sheathing.

How do you determine the starting point for the hip roof?

The hip roof starts 23 and a quarter inches back from the edge of the building, which corresponds to the run measurement.

What is the difference between a common rafter and a hip rafter?

A common rafter runs from the wall plate to the ridge, while a hip rafter extends from the corner of the building up to the ridge, forming the corner edge of the roof.

How do you calculate the length of a hip rafter using a calculator?

After inputting the common rafter length into the calculator, you press the hip and valley button to find the total length of the hip rafter, which does not include the overhang.

Why is the run measurement of the framing square adjusted when laying out hip rafters?

The run measurement is adjusted from 12 inches to 17 inches to account for the slower rise of the hip rafter compared to the common rafter, ensuring the correct angle and fit for the hip rafter.