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How many feet can you cantilever?

The recommended maximum extension for a cantilevered exterior deck is four feet. In this situation, 2X joists should extend back into the floor at least eight feet, using a recommended 2:3 ratio. It is possible to extend beyond four feet but each situation must be examined and analyzed for structural capacity.

openjoisttriforce.com - Cantilevers: Best practices with open-joist construction

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Used for centuries in many different ways, cantilevers as a construction device were first recognized in 19th Century bridge designs. But they gained significant notice in architectural use when Frank Lloyd Wright unveiled his iconic “Fallingwater” commissioned residence. There the cantilever was not just a structural means to an end but also a dramatic design feature. Today, cantilevers are commonly used for balconies and decks but are also effective in extending upper story living space beyond the boundaries of bearing walls. “Bargain” space results and architectural interest is often created through the use of cantilevers. Let’s look at how best to frame for cantilevers when using an open web floor joist like TRIFORCE®.

Establish the Situation

Any time a cantilever is being considered as part of a floor system design, loading conditions related to the cantilever must be recognized and analyzed. Design software will dictate specific framing practices but for our purposes here, general approaches to cantilever installation will be discussed.

Cantilevers Parallel to Joist Direction

In this situation, while the open web joist stops at an exterior bearing, a 2X extension from it extends beyond the bearing to become the cantilever joist (see following illustration). This 2X is fastened to the side of a TRIFORCE® joist so that it “snugs” against the joist webs and under the top chord of the joist. 1-1/2” dimension lumber is attached to the top of this 2X so that the cantilever can achieve the same top plane as the open joist. Where this 2X crosses the bearing, a solid wood filler is needed to transfer load. If the cantilever is being extended from the trimmable I-Joist end of a TRIFORCE® joist, a 5/8” wood filler is required on the OSB panel.

Cantilevers Perpendicular to Joist Direction

With TRIFORCE®, it is possible to construct a cantilever perpendicular to the joists by using 2X joists inserted through the open webs of the joists. In this situation, the following illustration shows proper framing to transfer load correctly to the bearing wall. The recommended maximum extension for a cantilevered exterior deck is four feet. In this situation, 2X joists should extend back into the floor at least eight feet, using a recommended 2:3 ratio. It is possible to extend beyond four feet but each situation must be examined and analyzed for structural capacity. In all cases where dimension lumber is used for framing an exterior deck, it is recommended that treated lumber be used. For more information about framing cantilevers in a TRIFORCE® floor system, please download our spec guide. Contact us with any questions. We’ll be glad to help.

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What is roof over porch called?

decks.com - Porch Roof Designs, Styles & Types | Decks.com

Different Types of Porch Roof Designs

The most common porch roof is a gable roof. The gable roof is a triangle-shaped roof that projects along a ridge down the center of the enclosure. The sides are sloped at a particular pitch rise over run to shed snow and water. For instance, a 6/12 roof pitch means the roof elevates 6’ over a 12’ span. Gable roofs usually overhang the walls of the enclosure on the sides thus creating the need for soffits and fascia. Gable roofs are familiar forms and blend in well with many house designs. The peak of a porch gable roof can sometimes create problems if it interferes with house windows. A hip roof is a more complicated roof style where all the roof sides slope downwards to the walls. There are no gables and the slope is generally relatively gentle. A square hip roof is shaped like a pyramid. Hip roofs are more difficult to build than gable style roofs because they require a more complicated set of roof trusses. They have the aesthetic advantage of providing a solid, compact appearance for the structure. A shed style porch roof involves a single sloping roof surface that attaches to the house wall on the high end and support posts on the low end. The shed style roof is common for long and narrow front porches. It doesn’t usually make sense to include a shed style roof over a deep porch because the roof line at the house will be too high and it will look out of place. Gable Porch Roof This is an example of an A framed gable end porch roof. Shed Roof This is an example of a one pitch shed style porch roof.