Minimum Roof Slope for Shingles, How to Measure and the Types

It is not difficult to see why homeowner tends to opt for shingles for roofing. Shingles are not that pricey if compared to other roofing options. They also come in varied designs, which enable application in any building.

Installation of this roofing must be carefully done, though. It is important to have basic knowledge such as minimum roof slope for shingles for the installation procedure.

Minimum Roof Slope for Asphalt and Shingle Roof

Before diving into a deeper discussion, such as minimum slope for a shingle roof, it might be better to look at shingle roofing benefits beyond pricing and diversity. First of all, most houses tend to utilize shingles made out of asphalt.

Minimum Roof Slope for Shingles

It is because the material is durable enough. Besides, the asphalt material can reflect light, which means that your roof will not get heated up that easily.

What are the steps of installing a shingle roof? Let’s take a look at the following guide.

  1. Prepare for safety gears and the workstation’s safety.
  2. Calculate the minimum roof slope for shingles and learn why the slope is an important component.
  3. Prepare the roof deck for the project.
  4. Start the task from the upper side of the roof to the lower part. Install protection underneath the roof of the desk to prevent upward water movement.
  5. Install ice dam protection over the eaves. It should extend up to ¾ inches beyond the eaves. The valleys on the roof should also be coated to improve water-shedding protection on the surface.
  6. Install the roof underlayment overlapping the ice dam and water protector. This creates secondary protection layer.
  7. Seal the valleys and the joints.
  8. Start installing the shingles on the roof by following package instructions. At this point, it is important to remember that the minimum roof slope for asphalt shingles must be fulfilled.
  9. Install caps for the hip and ridges.

Some people may have a hard time grasping technical ideas like minimum roof slope for shingles. All buildings must adhere to the code regulated by the local government. Since the roof gets exposed to water and snow in a cold climate, the roof should be able to let them slide down. If not, the water and snow will be accumulated on top and wear down one’s roof too quickly.

Thus, the minimum roof slope for shingles must be fulfilled first. For asphalt shingle roofing, the minimum slope is measured at 2-12 inches. A roof with such a slope has quite the angle to let water and snow run. However, since it is not that steep, the flow will not be as quick as the steeper roof. It might not be obvious to see the slope measurement. It is not that hard to calculate, actually.

How to Measure Roof Slope

To measure the roof slope, a homeowner can make a ratio by dividing rise by run. The rise is the measurement from the horizontal truss toward the top of a roof. Meanwhile, the run is the length of the horizontal roof truss. According to this standard, there are three types of slopes known by the general public.

Flat roof slope

The measurement of flat roof slope varying from 0-12 inches to 2-12 inches. However, asphalt shingle roofing should fulfill the minimum roof slope for shingles because it is impossible to install the shingle at an angle flatter than that. In a flat roof slope, a homeowner needs to find ways to ensure that water will run down safely.

Low roof slope

The measurement should range from 2-12 inches to 4-12 inches to be dubbed as a low roof slope. Since it is steeper than the low roof, water will run a lot quicker down. It is easy to install asphalt shingles on such roof slopes.

Conventional roof slope

The standard roof slope tends to measure beyond 4-12 inches. Shapes of the roof may vary a lot depending on the slope measure. This type of roofing easily fulfills the building code. However, a homeowner needs to take extra measures to prevent water from running down too quickly. It is especially applied on a very steep slope.

As you can see, constructing a shingle roof is not that simple. There are measurements to be taken, and therefore planning becomes quite important. It will be helpful to work together with an experienced consultant despite how easy DIY shingle installation is.

Luckily, there are special apps that can help measure slope. Manufactured shingles also come with a chart that includes minimum roof slope for shingles.