However there is also an architectural purpose to them.
House roof overhang.
Roof overhangs are the amount that the roof hangs over the top of the siding in residential home construction.
With the west east overhangs the main use is siding window protection and keeping rain snow from foundation.
No only does a roof overhang protect a facade from the ravages of weather it also can act like an awning to shade a patio or deck.
Flashing a patio roof ledger.
The patio is essentially unusable on a sunny afternoon in the summer.
Overhangs are extensions of the roof beyond the exterior wall i e the joists rafters or trusses and the decking they support cantilever past the wall.
The length of the overhang depends primarily on the climate.
We love the look of the no overhang scottish style roof line as well.
A house with a generous roof overhang provides an extra layer of shelter and protection no wonder it looks more welcoming.
Do not undervalue their importance.
This video looks at a couple of design options including attaching the roof ledger below that of the existing eaves and setting the patio roof atop the existing roof.
They are critical to shade windows from undesired solar heat.
An eave is the edge of the roof that overhangs the face of a wall and normally projects beyond the side of a building.
And also to protect exterior walls doors and windows from rainwater while keeping the foundation dry.
Eaves form the overhang to distribute water clear of the walls.
Overhangs are common in most house designs providing protection against both wind and rain.
If the house had a 24 overhang and the total perimeter of a simple gable roof measured 200 feet 50 feet long gutter times two 25 up the rake times four the estimated cost of the overhang woud be 2 feet times 70 times 200 feet 2800.
They also help to frame windows on upper stories.
Overhangs can be open.
Existing patio is outside the dining room on the west side of the house.
An overhang protects the upper portion of the wall that it is attached to from rainfall and it also shades the windows under it from the sun.
We will protect shade the west windows with cedar awnings grates.
Unless it will be protected from rain by the house s eaves or a solid roof a roof ledger that is fastened directly to a house with wood siding should be capped with galvanized metal z flashing that tucks up under siding to prevent water from seeping in behind it.
I figure the cost of a standard overhang at 70 a linear foot of roof edge per 12 of overhang.
With our house we are planning minimal east and west overhangs and ample south and north overhangs.