Where Is Roof Overhang Measured From

The siding underneath the overhang is known as the soffit.

Where is roof overhang measured from.

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. The base length is simply the distance from the second corner to the third corner on the house s long side. Most homes in frederick have standard overhang lengths. Usually homeowners or contractors adjust the overhangs to fit the weather in an area.

That is the roof s rise. Knowing that will determine what your roof s pitch since the run is 12 inches by default. The overhang of roof shingles is the amount of the shingle that extends past the lower edge of the roof creating a lip. The more water you keep from the structural components of the roof or fascia the longer these parts will last.

Roof overhangs might look relatively routine but there is a lot of design thinking that goes into creating the optimal dimensions for each one. This type of overhang is great for preventing most types of damage against bad weather. The typical maximum overhang is 2 feet. 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.

Having overhang prevents the water from making contact with the structural areas of the roof. 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. Now measure from the end of the level up to the bottom edge of the rafter. Some slight overhang is recommended in conjunction with a drip edge flashing to prevent water from getting under the roofing and onto underlying wood.

Homes in areas where rains are more frequent have longer overhangs with the maximum overhang length measured at 2 ft. Our calculator rounds up to the nearest foot so you can do the same when measuring. 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. They are essential for framing and shading windows reducing splashback and getting rain to fall far enough away from the foundation.

The next step is to measure the pitch also referred to as the roof slope of the roof deck. You ll need to figure out the vertical distance also known as the rise over a 12 horizontal segment also known as the run. Record these values as roof rise over run with the vertical measurement listed first and the horizontal second.