However in many situations the insulation may need to be primarily or entirely below the flat roof membrane and between the roof joists if so what are the best options.
No overhang flat roof.
I can understand not wanting one with a flat roof but the sloped roof without overhang i never understood.
Moderate climates in moderate climates there is some damage of wood decay and a roof overhang is recommended.
With the west east overhangs the main use is siding window protection and keeping rain snow from foundation.
Roof edge detail overhang extended to hide the thickness of the over roofing rigid insulation.
No roof leaks no problems.
Because there is so little danger of water damage there is no required overhang and overhang lengths are minimal and sometimes nonexistent.
A rake overhang is created by extending the roof beyond the gables of your shed.
In general roof overhangs offer an effective solution for how to protect windows doors and entryways.
We love the look of the no overhang scottish style roof line as well.
We will protect shade the west windows with cedar awnings grates.
Unvented flat roofs a technical discussion flat roofs have often been built with the insulation all on top of the vapor closed drainage plane as this avoids dew point condensation issues inboard of the roofing.
There is no good way to make that last.
Venting solutions for roofs with no overhang or soffit install special roof intake venting products that work at the lower edge of the roof decking underneath the first course of shingles.
There is also no gutter in the detail so you will be effectively routing rain down your wall.
There are two types of roof overhangs two consider.
Ways to frame the roof overhang.
No air leaks from underneath no problems.
You may want one or the other or both.
Installed a new fully adhered membrane to the top of the old board sheathing prior to adding all that rigid insulation.
If the roof overhang is not big enough then the only way to protect these windows doors and entryways is by recessing them into the thick exterior wall or by installing special casing and flashing for each door or entryway.
Overhangs add character and help your shed avoid that boxy flat look.
Framing the roof overhang is basically in line with the style and shape of your flooring.
With our house we are planning minimal east and west overhangs and ample south and north overhangs.
Types of roof overhangs.
As a rule there are two popular methods in framing it pant or flat roof overhang and gable roof overhang.
Additionally forming this needs to pay attention to the edge of your roof.