How roof overhangs work.
Optimum roof overhang.
For instance several features of a window will influence gain of solar heat and shade.
Roof overhangs a roof overhang is a simple architectural feature which can be used on the south side of the house to block direct sunlight in summer without reducing the available sunlight in winter.
The optimum depth varies with the latitude and the type of climate.
Doing so keeps basements and crawlspaces dry and it also helps to.
Roof and overhang systems should be designed to resist wind uplift especially in hurricane prone regions.
Roof overhangs might look relatively routine but there is a lot of design thinking that goes into creating the optimal dimensions for each one.
With composite siding such as boral s truexterior siding over a ventilated rain screen and with properly executed flashing at the windows and doors the walls on the fhb house will be able to handle rain just fine.
An important component of passive solar design is calculating building openings doors and windows and roof overhangs.
They are essential for framing and shading windows reducing splashback and getting rain to fall far enough away from the foundation.
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If the building element bears more than about 30 off true south the effectiveness of an overhang as with any solar feature begins to decrease significantly.
Jonr senior member posts 5341.
Overhangs are most effective for south facing elements in the northern hemisphere and at midday.
Optimum overhang dimensions for energy saving 295 sun fig.
Those larger than 2 feet wide have to withstand very high uplift so they should be engineered.
Roof overhangs at the eaves and rakes protect the walls below from rain and sun.
Roof construction and materials considerations roof decking.
Oversized overhangs can increase the risk of roof or truss uplift.
For high wind resistance use 7 16 inch or 19 32 inch plywood or osb roof decking attached with nails not staples.
Figure 2 illustrates how this is possible.
Roof overhangs should be no more than 2 feet wide.
Geometry of overhang separated from top of window.
The size of the window width and height and the window s relationship to the roof the space above the window influences the direct.
Borst passive solar roof overhang design calculator.
But are they really necessary.
Because the sun travels a higher path in the sky in the summer than in winter the overhang blocks.
There isn t general rules to size an overhang.
