Roof Overhang Framing Details

In this system the outer framing under the overhanging roof deck sheathing is formed by two parallel long 2x4 s or 2x6 s that are connected together laterally by short blocks like the rungs of a ladder.

Roof overhang framing details.

Overhangs can vary in width from a few inches to several feet. On sheds and homes overhangs are commonly referred to as eaves or rakes depending on where they are located. The following conceptual details figures 9 1 to 9 6 show some of the typical conditions commonly encountered. The ladder detail is frequently used when the builder continues the same truss size or rafter size all the way through the gable end.

For wood framed construction comparable details are contained in the american wood council wood frame construction manual. These are limited to an overhang length of 12 and apply for up to 139 miles per hour ultimate wind speed. Eaves form the overhang to distribute water clear of the walls. When designing a gable end eave without a return the dimensions to look at are the width of the trim set between 6 in.

What is a roof overhang. That is their functional purpose. 9 3 built up roofing because this is a wood detailing manual this section will only attempt to highlight some basic edge conditions that often adversely affect adjacent wood construction. The first approach to achieving a strong durable struc.

Position the square at the end of the rafter board with the tongue on your left and facing away from you. Eave overhang detail with that in mind we kept a roof overhang at the eaves as it provides a nice shadow line and protects the second floor windows from a bit of the summer sun. An overhang is the portion of the roof that runs past the wall providing coverage for the space around the foundation of your shed. Thick and the overhang from the side wall set between 12 in.

Add the length of the overhang beyond this mark and. Details for conventional wood frame construction. As shown earlier in figure 2 there are some prescriptive details in the irc for cold formed steel construction. However there is also an architectural purpose to them.

The diagonal plates are 3 1 2 inches down from the tops of the rafters to support 2x4 lookouts for framing the rake. Start with roof framing. After the end points of the plates are located the length is found using a base 1 triangle for a 6 in 12 pitch where the hypotenuse is 1 118 times the length of the base. They also help to frame windows on upper stories.

Measure form the top of this line down the board to determine the line length or length of the rafter less the ridge. Ladder details are usually adequate if the overhang is less than about 8 inches although they are frequently used for longer overhangs. At the rakes however with a nod to yankee frugality and clean modern lines we kept the roof trim as close to flush as practical while still allowing for a rain screen channel ventilated at the top as well as the bottom. To 18 in depending on the style of the building.

Wide especially when the eave overhang is less than 12 in. Avoid gable ends that are over 8 in.