Solar Design Roof Overhangs

I used sketchup to help determine how the solar path would fall on the house i am designing.

Solar design roof overhangs.

Overhangs are most effective for south facing elements in the northern hemisphere and at midday. In passive solar home design exterior roof overhangs provide a practical method for shading building elements such as windows doors and walls. With the window heights and overhangs i used in the model at noon on june 21 the entire glazing of the south elevation windows are completely in shadow but just barely. In passive solar home design exterior roof overhangs provide a practical method for shading building elements such as windows doors and walls.

Here the panels are mounted on a steel structure that integrates the panels seamlessly into the roofline. 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. Solar overhang with glass on glass panels. How roof overhangs work.

At noon on january 21 the glass is completely exposed. 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. This beautiful modernist home in sarasota florida uses lumos solar glass on glass solar panels. Design solar altitude angle for full sun deg from passive solar altitude angle calculator build height of roof overhang from top of glass feet or leave blank build depth of roof overhang from glass feet or leave blank requested solution 0 full shade full sun 1 full shade 2 full sun.

How roof overhangs or other window overhangs work to control heat and solar gain.