What is the angle of a hip roof?

Aerial close-up view of a modern asphalt shingle roof

The roof slope factor is simple to calculate. All you need is a basic trigonometry equation and a calculator with a square root button. Knowing and utilizing the element can be very beneficial when measuring the area of the roof, such as for purchasing roofing materials. Trigonometry is essential for calculating the height of a roof because it is based on triangles; in particular, the roof is the hypotenuse, or longest side, of a triangle. So, What is the angle of a hip roof?

Stucco house with brown cross-hipped roof, chimney and rain gutter with downspout, soffit board, outdoor air conditioner unit against blue sky, What is the angle of a hip roof?

What is the angle of a hip roof?

The hip roof, sometimes known as a hipped roof, is sloping with no vertical ends. The outside angle where two adjacent sloping sides of a roof meet is the hip. The amount by which such an angle is beveled is referred to as the hip level. Here's how you calculate the angles.

The tangent of the roof angle is calculated by dividing the total roof height by the entire roof width. For example, the deviation of the roof angle is 0.5 if the height is 7.5 feet and the width is 15 feet. Because 7.5 divided by 15 equals 0.5, the tangent of the roof angle is 0.

Factor Analysis and Solution

From the foundation to the ridge, the overall length of a roof is calculated by squaring the run, adding it to the square of the rise, and taking the square root of the total. The factor is then divided by 12. Assume you have a 6/12 pitch roof. 36 plus 144 equals 180, and adding 36 plus 144 equals 180 again. The square root of 180 is 13.416, which is rounded to 13.417 because there are two zeros after the decimal point (1)—dividing 1.

How to calculate the distance formula 

A hip rafter is a rafter that extends from the end of a roof ridge to a corner of the eaves. The Pythagorean theorem enables you to calculate the length of a hip rafter without physically measuring it, which means you must climb onto the roof. The sum of the squares of the lengths of a triangle's other two sides is equal to the square root of the length of its hypotenuse.

You'll Need the Following Things.

  • Angle finder
  • Tape measure
  • Calculator

  1. To get the roof's angle, place an angle finder against the underside of one of the rafters. The bottom of a rafter is frequently exposed in an attic or under the eaves of a house. Assume for this example that the rafter's angle is 23 degrees.
  2. To get the roof's span, measure the distance between the eaves' corners on one end of the structure. In this case, assume that it is 25 feet.
  3. To calculate the run of the roof, divide the length of a single story by two. The roof span is 25 feet, so the run of the roof is 12.5 feet separated by two = 7.5 feet.
  4. Divide the run of the roof by the cosine of the angle of the roof to obtain the length of a common rafter. The run of the roof in this example is 12.5 feet, and the angle of the roof is 23 degrees, so the length of a common rafter is 12.5 / cosine 23 degrees = 13.6 feet.
  5. From a corner of the eave to the end of the roof's ridge, measure the horizontal distance. In this example, suppose that this distance is 12 feet.
  6. To calculate a hip rafter's length, add the square of the result from Step 4 to the square of the result from Step 5. Step 4's length was 13.6 feet, and Step 5's length was 12 feet, resulting in a total of 329 square feet.
  7. To determine the length, take the square root of Step 6's result. The result from Step 6 was 329 feet long, so the hip rafter is 18.1 feet long.

Types of Hip Roofs

The most popular hip roof style in residential construction is one with four roof planes, also known as surfaces. These roof planes are made up of two planes that cover the ends of the home, starting at the ridge and ending at the eaves, and two planes that cover the sides from start to finish. Four plan hip roof is ideal for houses with a square or rectangular footprint at the base. Another basic form of hip roof design is utilized for homes with additions on the rear or side that do not make a simple square or rectangle.

How to Calculate the Hip Roof Pitch

The angle at which the roof planes rise vertically from the horizontal line generated by the wall plates found at the top of each exterior wall is crucial in residential construction calculations for a hip roof. The pitch calculation ratio template is based on a 12-inch model, with 12 inches serving as the horizontal denominator in the pitch calculation ratio. The nominator of the pitch calculation ratio is determined by the angle at which the roof plane rises. A 4:12 hip roof pitch is one example of this calculation, expressed as a percentage. It represents a 4-inch vertical rise for every 12 horizontal inches.

The standard hip roof pitch

The most typical hip roof pitch ratios are 4:12 and 6:12, although they vary depending on factors such as snow, rain, and wind conditions. Steeper hip roof pitch ratios allow for less snow and rain accumulation on the roof, whereas lower ones offer greater wind resistance. Architectural preferences also influence the pitch of hip roofs, which are designed to match the overall aesthetic of a home along the roofline. Roof planes with gables built into them are one example and designs that include decorative elements into the plans, such as dormers and fireplaces.

One of the most appealing aspects of a hip roof in residential construction is its simplicity, especially when compared to more advanced designs with more than four roof planes. Even though a hip roof is more challenging to build than a gable one (a roof with only two roof planes), rafter cuts and plumb lines are usually measured in the same way. In particular, a four-planed hip roof creates an equal pitch for all roof surfaces, giving the property a clean, consistent appearance with constant eave lines and a minimum of variation in the roof.

Leave a Reply

Your email address will not be published. Required fields are marked *