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

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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 kind of 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 installation procedure.

Minimum Roof Slope for Asphalt and Shingle Roof

Before diving into 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 shingle made out of asphalt.

Minimum Roof Slope for Shingles

It is because the material is durable enough. In addition, the asphalt material is capable of reflecting light which means that your roof will not get heated up that easily.

What are the steps of installing 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 learning the important reasons why the slope is important component.
  3. Prepare the roof deck for the project.
  4. Start the task from the upper side of roof the lower part. Install protection underneath the roof 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 by it in order 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 instruction. At this point, it is important to remember that minimum roof slope for asphalt shingles must be fulfilled.
  9. Install caps for the hip and ridges.

Some people may have a hard time to grasp technical idea like minimum roof slope for shingles. All buildings must adhere to the code regulated by local government. Since the roof gets the exposure from water and snow in 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. Roof with such 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 steeper roof. It might be confusing to see the slope measurement. It is not that hard to calculate, actually.

How to Measure Roof Slope

To measure the roof slope, homeowner can make ratio by dividing rise by run. The rise is measurement from the horizontal truss toward the top of a roof. Meanwhile, run is the length of horizontal roof truss. According to this standard, there are three types of slope known by 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 minimum roof slope for shingles because it is impossible to install the shingle at an angle flatter than that. In flat roof slope, homeowner needs to find ways to ensure that water will be able to run down safely.

Low roof slope

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

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 fulfill the building code, however, homeowner needs to take extra measure to prevent water from running down too quickly. It is especially applied in very steep slope.

As you can see, constructing 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 experienced consultant despite how easy DIY shingle installation is.

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