Some decades ago along with modern design principles there came the widespread vogue of flat roofs and no roof overhangs.
Good roof overhang for sunny climates.
With fixed overhangs overheating in the fall months may still be a concern because by then the sun is lower in the sky while the outdoor temperatures may still be fairly high.
South facing windows can effectively be shaded with fixed overhangs because in the summer the sun is much higher in the sky than in the winter when that sunlight is beneficial for heating.
Metal roofs are extremely durable and can withstand large amounts of rain and wind with minimal need for repair.
Here the recommended overhang length can extend up to 12 inches for moderately rainy climates or up to 18 inches for climates that experience more frequent rainfall.
These kinds of roofs are rampant across the northern part of the us largely due to their ability to withstand cold climate elements like wind snow and heavy rain.
In moderate climates there is some damage of wood decay and a roof overhang is recommended.
In a cold climate the primary purpose of ventilation is to maintain a cold roof temperature to avoid ice dams created by melting snow and to vent any moisture that moves from the conditioned.
If durability is your primary goal a metal roof made from either steel or aluminum is an excellent option for your roof.
The intent of roof venting varies depending on climate but it is the same if you re venting the entire attic or if you re venting only the roof deck.
In general roof overhangs offer an effective solution for how to protect windows doors and entryways.
Best roof for rainy climate.
Cross index the 36 row and the mixed climate column and the recommended values are an overhang depth of 4 0 and a height above the window of 2 8.
Roof overhangs for summer shade and moisture protection.
For instance i think that in heavy snow country large overhangs can lead to ice dams forming on the overhangs snow melting.
And also to protect exterior walls doors and windows from rainwater while keeping the foundation dry.
Roof overhangs provide shade.
They are critical to shade windows from undesired solar heat.
Do not undervalue their importance.
See below i need to acknowledge there are some good reasons in some places to not have a large overhang.
In very hot climates many designers specify a hipped roof since a hipped roof with wide roof overhangs will keep the sun off the windows on all four sides of the house.
Much of the united states falls into this category especially along the coasts.
Overhangs are a key part of any home s design.
