How Far Should Roof To Wall Flashing Overhange The Eaves

Too much overhang and the shingles could blow off in high winds.

How far should roof to wall flashing overhange the eaves.

Two feet is the general maximum length for a typical roof overhang. Overhangs can vary from a few inches to a few feet depending on preference. Eaves are located at the down slope edge of a sloped roof and serve as the transition between the roof and fascia wall. The sketch above illustrates the end profile of roof drip edge flashing and shows its placement on the roof.

This leads to a situation where there is an excess amount of shade and the exterior of the home appears dark and gloomy. An eave typically has a metal edge flashing and gutter that are attached to a wood fascia trim board. Only a 3 feet 1 meter overhang third image provides enough shade to protect the entire window for that position of the sun. The roof overhang does not extend far enough.

But the same overhang will not shade the entire window when the sun is lower second image. However the suggested width of an overhang is between 12 and 18 for eaves and no more than 8 for rakes. Metal is usually installed on rafters or strip sheathing rather than the solid decking used under other materials. Overhangs are extensions of the roof beyond the exterior wall i e the joists.

Some slight overhang is recommended in conjunction with a drip edge flashing to prevent water from getting under the roofing and onto underlying wood. Usually you won t see much of drip edge as it s under the roof shingles under the underlayment and behind the roof gutter. That said overhangs can extend as far as 2 without the need for external supports. Roof overhangs at the eaves and rakes protect the walls below from rain and sun.

Too little can allow water to seep into rake or fascia boards. A related problem is that the roof is actually at greater risk of wind damage. With composite siding such as boral s truexterior siding over a ventilated rain screen and with properly executed flashing at the windows and doors the walls on the fhb house will be able to handle rain just fine. In the first case the overhang is simply too big for the home.

When the sun is higher in the sky first image a 2 feet 60 cm overhang is long enough to shade the entire wall. But are they really necessary. This will protect a roof from most types of damage. Lengths of drip vary but typically it s sold in ten foot lengths 120.