What is Pitched Roof ? How to calculate roof pitch?

What is a Pitched roof?

  • A pitched roof is a style of roof that is common among others.
  • It has slopes on two sides.
  • It is good for drainage, and it is made with various materials.

Materials for pitched roof

1) Asphalt shingles

What is Pitched? How to calculate roof pitch?
  • It is made of organic or fiberglass materials.
  • It is lightweight and easy to install.
  • It is durable, fire-resistant, and affordable.

2) Clay tiles

What is Pitched Roof ? How to calculate roof pitch?
  • It is made of clay that is baked at a high temperature.
  • It is heavy so requires a strong support structure.
  • It is durable and fire resistant and also good for hot climates.

3) Metal

What is Pitched Roof ? How to calculate roof pitch?
  • It is made of steel, aluminum, copper, or zinc
  • It is lightweight and durable.
  • It is also available in various colors and styles, and it is good for all climates.

4) Slate

What is Pitched Roof ? How to calculate roof pitch?
  • It is made of natural stone, which is heavy and requires a strong support structure.
  • It is more durable and provides resistance to fire
  • But it’s expensive.

5) Wood shingles

What is Pitched Roof ? How to calculate roof pitch?
  • It is made of cedar, redwood, or pine.
  • It is lightweight so it’s easy to install.
  • It requires regular maintenance.

How to find the pitch of a roof steps?

If we measure the distance between the outer edge of the roof and the highest point directly under the ridge of the roof. This is known as the “rise” of the roof.

Here we measure the distance from the outer edge of the roof to the point where we took the first measurement. This is known as the “run” of the roof.

Now in this step, we divide the rise by the run.

And multiply the result by 12 to get the roof pitch in inches per foot.

If we don’t have a roof pitch in inches per foot and have the roof pitch in degrees, we have to use a conversion chart or online calculator to convert it to inches per foot.

How to calculate roof pitch?

Roof pitch can be defined as the measure of the steepness of a roof, which is generally expressed as a ratio of the rise (vertical height) to the run (horizontal distance).

What is Pitched? How to calculate roof pitch?

Its typical measuring unit is inches or feet per foot. The method of calculating roof pitch using is clarified below using a numerical example.

For calculating the roof pitch as a ratio, we need to measure the rise and run of the roof. Let us consider that the rise is 6 feet and the run is 12 feet.

What is Pitched Roof ? How to calculate roof pitch?

Now we divide the rise by the run so we can get the ratio: 6/12 = 0.5.

Here in this step, we multiply the ratio by 12 to change its unit to inches per foot: 0.5 x 12 = 6 inches per foot.

Hence, the roof pitch in this numerical example is 6:12 or 6 inches of rise for every 12 inches of run.

Another method to calculate roof pitch is by using a pitch gauge. A pitch gauge is a specialized tool that measures the angle of the roof and provides the pitch as a ratio or degree.

What angle is a 5/12 pitch roof?

According to the standard pitch of a roof, a 5/12 pitch roof has a slope angle of approximately 22.62 degrees.

Too calculate the slope angle, you can use the arctangent function (tan-1) or a roofing calculator to calculate the slope angle.

By using the arctangent function, the slope angle can be calculated as follows:

Tan-1(5/12) = 22.62 degrees

Hence, a 5/12 pitch roof has a slope angle of approximately 22.62 degrees.

What is a 6/12 pitch roof?

According to the standard pitch of a roof, a 6/12 pitch roof is a roof that have rise 6 inches vertically for every 12 inches of horizontal distance. This is equal to or similar to a 26.57-degree angle of slope.

In other words, for every 12 feet (or any other unit of horizontal distance), the roof rises 6 feet (or any other unit of vertical distance).

The pitch of a 6/12 roof is moderately steep, and it is a common pitch used in many residential and commercial buildings.

How to build a pitched roof?

1) Designing the roof:

  1. Firstly, we determine the pitch and size of the roof
  2. Now we need to decide on the roofing material and calculate the quantity needed
  3. And finally, we plan for the roof’s structural support.

2) Preparing the roof frame:

What is Pitched Roof ? How to calculate roof pitch?
  1. Firstly, we install the ridge board at the peak of the roof
  2. And install the rafters at the correct spacing and proper angle
  3. Here we also have to install collar ties or rafter ties for added support
  4. At last, we need to install the fascia and soffit board

3) Installing the roof covering:

  1. Priority is given to installing the underlayment over the roof deck
  2. Now we install the starter course for the roofing material
  3. After that, we install the remaining courses of the roofing material
  4. At last cut and install the ridge cap at the peak of the roof

4) Finishing touches:

  1. At the final touch, we install the gutters and downspouts
  2. We can also install vents if necessary
  3. And apply any necessary sealant or flashing

The process of building a pitched roof can vary depending on the specific design, materials, and structural requirements of the roof. We should consult a licensed contractor or professional before starting any roofing projects.

What is a 4 12 roof pitch?

A 4/12 roof pitch can be defined as a roof that rises 4 inches vertically for every 12 inches of horizontal distance. According to the standard pitch of the roof, it is known to be equivalent to an 18.43-degree angle of slope.

In different words, for every 12 feet (or any other unit of horizontal distance), the roof rises 4 feet (or any other unit of vertical distance).

A 4/12 roof is a relatively low pitch, which makes it easier to walk on and install roofing materials. This 4/12 pitch is generally used in residential construction for homes with a modern or minimalist aesthetic.

What is the standard pitch of a roof?

There is not any such standard that one-size-fits-all standard pitch for a roof, it has a high possibility that it can vary depending on factors such as the building design, climate, and roofing material used in it.

However, some of the common roof pitches used in residential and commercial construction include the below degrees:

4/12 pitch (18.43 degrees)

5/12 pitch (22.62 degrees)

6/12 pitch (26.57 degrees)

7/12 pitch (30.26 degrees)

8/12 pitch (33.69 degrees)

9/12 pitch (36.87 degrees)

10/12 pitch (39.81 degrees)

12/12 pitch (45 degrees)

The roof’s pitch is an important consideration when choosing roofing materials and calculating the load capacity of the roof.

Read Also,

Types of roof | Types of roof materials | Their uses with pictures

Types of tiles for roof | Types of tiles for home, Cement Tile, Ceramic Tile

Foundation waterproofing membrane – Different types and Materials

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"Structural Engineer" with over 5 years of experience in estimation, structural design, and surveying. I am passionate about using his skills to create safe and sustainable structures. I am also a keen writer, and I enjoy sharing my knowledge and experiences with others.