Roof Overhang Shading

That might be desirable during winter months but very uncomfortable during hot summer months.

Roof overhang shading.

The depth of roof overhangs is crucial in cold and moderate climates where oversized overhangs will have negative side effects. For hot dry climates with some heating requirements gradually increase the overhang up to 50 of height full shading. An overhang or some sort of solar control or solar shading is a crucial element in passive solar design because it blocks the sun s heat energy when it is not desired. The shade is in 1 increments.

Using sketchup i just fiddled around with the overhang width window size and vertical placement until i got the desired shading effect. The roof overhang is too wide. Shade each data cell has the percentage of shade listed in addition to the background color as an indicator. In the first case the overhang is simply too big for the home.

How roof overhangs or other window overhangs work to control heat and solar gain. The sun is in 1 increments. Overhangs are most effective for south facing elements in the northern hemisphere and at midday. Overhang depth for solar heat gains and shade.

The roof overhang does not extend far enough. There are two common problems encountered with roof overhangs. A value of 73 for example indicates that the overhang is shading about 27 of the window area and 73 of the window is in the sun. This leads to a situation where there is an excess amount of shade and the exterior of the home appears dark and gloomy.

You may use wide overhangs and verandas in hot climates without a cold season and in hot wet climates with high levels of rainfall but oversized overhangs in other. For example if the roof s overhang does not shade the window during the hottest hours of the day direct and reflected sun light will heat the interior. Because the sun travels different paths across the sky in the winter low and summer high time an overhang can be constructed to utilize and manipulate the heat energy from the sun. The following snips show shading at noon on april 16 june 21 september 1 december 1 and february 1.