Roof Overhang Passive Solar Design

Overhangs are most effective for south facing elements in the northern hemisphere and at midday.

Roof overhang passive solar design.

When sunlight strikes a building the building materials can reflect transmit or absorb the solar radiation. You can use the free software sketchup to draw the house and it will draw sun shadows for any date time at your location. How roof overhangs or other window overhangs work to control heat and solar gain. In passive solar home design exterior roof overhangs provide a practical method for shading building elements such as windows doors and walls.

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. For instance several features of a window will influence gain of solar heat and shade. An important component of passive solar design is calculating building openings doors and windows and roof overhangs. Work out the right window solar overhang required.

Cost effective passive solar design. Passive solar design refers to the use of the sun s energy for the heating and cooling of living spaces by exposure to the sun. Jonr senior member posts 5341. Borst engineering construction llc competence integrity and professionalism are integral to all that we do.

User 757117 jul 16 2012 05 54pm 3. Interactive online passive solar eaves calculator. Overhangs are most effective for south facing elements in the northern hemisphere and at midday. How roof overhangs work.

Erik not sure what kind of insolation you receive at your site but it might be worth it to consider the. Works worldwide by latitude or address. Borst passive solar roof overhang design calculator. In passive solar home design exterior roof overhangs provide a practical method for shading building elements such as windows doors and walls.

Here s a link to a free web based tool to help you size roof overhangs on a passive solar building. 24 dec 2012 02 45 pm. The size of the window width and height and the window s relationship to the roof the space above the window influences the direct and indirect gain of solar heat. Design the roof overhangs generally passive solar design requires overhangs that are sized to fully shade the south facing windows on the summer solstice june 21 and to allow full sunlight to enter on the winter solstice december 21.

I also urge you to read this article.