The part that overhangs the support should not be longer than 25 of the length of the adjacent fully supported part as shown in figure 2.
Framing cantilever roof overhang.
Floor cantilevers supporting an exterior balcony are permitted to be constructed in accordance with table r502 3 3 2.
Shedding rainwater away from siding and trim especially from door and window sills can greatly reduce rot mildew and a host of other problems that can be caused by water streaming down the face of the building.
Most architects engineers like to use a 1 2 or better cantilever ratio favoring the inside in these situations.
Figure 2 loads created by cantilever framing the non cantilevered end must either be counterweighted or firmly anchored to its support to counter the upward tendency that comes about when a load is placed on the overhang.
As far as this author can tell this area of light construction is not covered in the international residential code for wood framing but it is covered for cold formed steel framing where section r804 3 2 1 2 contains requirements for rake overhangs the two methods shown are the cantilever outlooker option 1 and the ladder outlooker option 2.
This video will.
Floor cantilever spans shall not exceed the nominal depth of the wood floor joist.