Where Is Roof Overhang Measured From

The overhang of roof shingles is the amount of the shingle that extends past the lower edge of the roof creating a lip.

Where is roof overhang measured from. The siding underneath the overhang is known as the soffit. The base length is simply the distance from the second corner to the third corner on the house s long side. Metal is usually installed on rafters or strip sheathing rather than the solid decking used under other materials. The next step is to measure the pitch also referred to as the roof slope of the roof deck.

Knowing that will determine what your roof s pitch since the run is 12 inches by default. Our calculator rounds up to the nearest foot so you can do the same when measuring. Having overhang prevents the water from making contact with the structural areas of the roof. Record these values as roof rise over run with the vertical measurement listed first and the horizontal second.

Doing so keeps basements and crawlspaces dry and it also helps to. On a ladder at the walled part of the pitched roof place the level against the roof overhang rafter with the 12 inch mark on the rafter s bottom edge. The base width is the distance from one corner of your roof to the other at its base on the short side of your house. Most homes in frederick have standard overhang lengths.

The second option if the box is unchecked means that the specified overhang dimension will be measured from the exterior finish face of your wall out to the rafter ends. A typical metal roof overhang may be 2 to 4 inches or even less. Some slight overhang is recommended in conjunction with a drip edge flashing to prevent water from getting under the roofing and onto underlying wood. They are essential for framing and shading windows reducing splashback and getting rain to fall far enough away from the foundation.

Now measure from the end of the level up to the bottom edge of the rafter. The wall section above right which by the way is from my recently published book residential roof design using autodesk revit shows an overhang of one foot six inches. Roof overhangs might look relatively routine but there is a lot of design thinking that goes into creating the optimal dimensions for each one. The typical maximum overhang is 2 feet.

This type of overhang is great for preventing most types of damage against bad weather. You ll need to figure out the vertical distance also known as the rise over a 12 horizontal segment also known as the run. Usually homeowners or contractors adjust the overhangs to fit the weather in an area.