Understanding and designing the perfect roof pitch for your home is a crucial step. Whether you are a homeowner or a contractor, measuring the roof pitch mainly determines how it is made and what type of material should be used. It decides the overall efficiency as well as the appeal too. Read the article to learn about roof pitch calculation.
See also: Roofing materials: Types and features
What exactly is a roof pitch?
Roof pitch is the angle at which the slope of the roof is made. It is also denoted by the ratio of vertical rise to the horizontal run. Roof pitch determines drainage efficiency and is an important aspect of roof building.
Essentials required for measuring a roof pitch
Before you start measuring the roof pitch, there are some necessary tools that you should gather:
Tape measure: A measuring tape to measure the vertical rise as well as the horizontal run.
Level: To determine a horizontal reference line.
Calculator: For precise and quick calculations.
Different ways to measure roof pitch
There are mainly two ways in which you can measure the roof pitch. You can choose according to your preference and the availability of tools:
Measure from the roof surface
The first step is to position the level horizontally with respect to the roof surface. You can make sure that it is properly aligned when the bubble in the level is in the centre.
Using a measuring tape, measure the distance from the roof surface to the bottom edge of a level. This vertical distance is your vertical rise.
To measure the horizontal run, keep the measuring tape at the bottom edge of the level and measure up to 12 inches away. This is the horizontal run.
The ratio of vertical rise and horizontal run is called the roof pitch.
Measuring from below the attic
The first step is to locate the bottom rafter, and with the help of a measuring tape, calculate the distance from the bottom of the rafter to the point where it meets the deck of your roof.
Then measure the horizontal run, which is the distance between the inside of the rafter to the roof decking.
Roof pitch can be calculated in the same way, i.e. the ratio of the vertical rise to the horizontal run.
How to interpret the roof pitch calculation?
Depending on the roof pitch ratio, there are several types of roof pitches:
Low slope roof (2:12 to 4:12)
These types of roofs are usually built on commercial buildings as they ensure proper drainage to prevent the collection of water during rains.
Conventional slope roof (4:12 to 9:12)
As the name suggests, it is a conventional roof style which is generally seen on residential properties.
Steep slope roof (9:12 and above)
These slopes provide a unique look and aesthetic. Not much suitable for commercial buildings or residential properties, these are seen on historical buildings.
Why is accurate roof measurement important?
- It is important to determine roof pitch because different kinds of roofing materials are not suitable for all kinds of roofs.
- The right roof pitch also determines how efficiently the drainage system will work.
- Roof pitch also determines the strength and how effectively the load is distributed. It is especially important in areas where it snows heavily.
- It also affects the aesthetic appeal and determines the overall look of the building or house.
Some tips for accurate measurements
- Always double-check the measurements and the calculations.
- Be cautious while measuring the roof surface.
- Ask for assistance as it helps in taking measurements more precisely.
FAQs
Can the roof pitch be changed during a renovation?
Although it can be changed, it is a very time-consuming, complex and expensive process.
What is a low-pitch roof?
A low-pitch roof is relatively less steep and can usually be seen in many modern architectures.
How does roof pitch determine the roofing material?
Roofing material greatly depends upon the roof pitch; for example, a roof with a steep slope requires a material which is able to shed off water fast. While for the roofs with a lesser roof pitch ratio, more options are available.
Is it necessary to measure the roof pitch from the roof?
Yes, for better accuracy, it is important to measure the roof pitch from the roof.
What is a high roof pitch?
A high roof pitch has a really steep slope. A major example of such roof pitches is historical monuments.
| Got any questions or point of view on our article? We would love to hear from you. Write to our Editor-in-Chief Jhumur Ghosh at jhumur.ghosh1@housing.com |
