My roof valley is wider than this. I want light to pass in through. Is the polycarbonate I should use? Can I make a joint somewhere in the middle through the length with polycarbonate. I need some advice to get this done.
How to create a polycarbonate roof valley
jointsroof
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Call an architect. Seriously call one. Let them know what you'd like to do. Ask for some ideas. They can take the structure, age, other home styles in the area and give you a slew of options that are suitable and sound.
And it shouldn't cost that must either. They can suggest and sketch out rather quickly the style based on many factors including load weight, pitch, roof material you're going to use and more. There's modern materials, ways to get light in, sun roofs, venting, insulation that all factor in to a design.
A local architect is also in the know on building codes etc.
Looking around for ideas it's one thing but if you're serious about replacing the roof, an architect is the one to consult.
Solution I ended up with:
I extended the shingles well over the edge (not shown) and also added some kick out flashing (not shown) to further divert water away from the side wall and to the roof plane below.
Best Answer
You will have a difficult time getting approval for a non-traditional material in a roof assembly, code wise.
Additionally, polycarbonate has degradation problems with UV light: City Plastics
Acrylic or safety glass might be a better choice.
HOWEVER, the real fly-in-the-ointment is the structure necessary UNDER the roof valley, which is not transparent.
Stick with standard roof windows BETWEEN the framing members. It will be warrantied, accepted by your insurance and code authority, and easily installable by a journeyman roofer.