How Far Should Roof To Wall Flashing Overhange The Eaves

Some slight overhang is recommended in conjunction with a drip edge flashing to prevent water from getting under the roofing and onto underlying wood.

How far should roof to wall flashing overhange the eaves.

Overhangs are extensions of the roof beyond the exterior wall i e the joists. In the first case the overhang is simply too big for the home. Roof overhangs can extend farther than 2 feet but beyond this length they begin to lose structural integrity and require external supports. A related problem is that the roof is actually at greater risk of wind damage.

Only a 3 feet 1 meter overhang third image provides enough shade to protect the entire window for that position of the sun. Usually you won t see much of drip edge as it s under the roof shingles under the underlayment and behind the roof gutter. Eaves are located at the down slope edge of a sloped roof and serve as the transition between the roof and fascia wall. 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.

Overhangs can vary from a few inches to a few feet depending on preference. Metal is usually installed on rafters or strip sheathing rather than the solid decking used under other materials. When the sun is higher in the sky first image a 2 feet 60 cm overhang is long enough to shade the entire wall. Lengths of drip vary but typically it s sold in ten foot lengths 120.

The edge of the shingles should hang over a roof between an inch and an inch and a half or between a half inch and three quarters of an inch if drip edge flashing is installed. Two feet is the general maximum length for a typical roof overhang. This leads to a situation where there is an excess amount of shade and the exterior of the home appears dark and gloomy. Too much overhang and the shingles could blow off in high winds.

An eave typically has a metal edge flashing and gutter that are attached to a wood fascia trim board. The sketch above illustrates the end profile of roof drip edge flashing and shows its placement on the roof. But are they really necessary. 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. This will protect a roof from most types of damage. Roof overhangs at the eaves and rakes protect the walls below from rain and sun. That said overhangs can extend as far as 2 without the need for external supports.