To keep the porch roof framing as simple as possible we installed a structural ridge supported by posts at each end with the common rafters landing on top of the ridge.
Picture of ridge line meeting a roof valley.
If you re saying they should be off center please explain.
In traditional house framing also called stick framing a basic roof frame consists of opposing pairs of sloping rafters that meet at their top ends at a ridge board or ridge beam.
The top end of each rafter is cut at an angle so that it meets flush with one broadside of the ridge board and the ridge is sandwiched between the rafters.
When deciding how to shingle a roof valley you will need to consider your materials the climate and the desired look of the roof.
Part 1 a guide to roof construction covers an overview of flat and pitched roofs.
Your observation is correct about the h v line meeting the inside corner of the fascia instead of the outside.
Part 3 of the four part guide to roof construction covers pitched roof detail.
To get the most out of it is helpful to also read parts 1 and 2.
Roof ridges and ridge tiles roof hips and hip tiles roof valleys roof verges and lead flashings.
The three methods to shingle a roof valley.
The hip valley members are 1 1 2 thick and my intent was to show the bottom surface of roof sheathing meeting at their centers.
Ridge boards and beams.
Such buildings may have more than four hips in the roofs and they form valleys at the inside corners.
Iko recommends that you install architectural shingles with the open valley method for the best roof performance.
Using a pitch measuring tool that i d made we also determined that the exact pitch of the shed roof was 3 1 2 in 12.
This recommendation includes iko s premium shingles.