What are the dimensions of the deck? And the spacing of the posts? You cannot or should not just extend what is there 6'. You probably need to replace at least some posts.
What kind of a solid roof did you have in mind? If you just need shade, would something leaning toward a sailcloth or awning material work or do you need to frame something like a timber structure to stand up to wind, etc.
Do you have pictures?
What kind of a solid roof did you have in mind? If you just need shade, would something leaning toward a sailcloth or awning material work or do you need to frame something like a timber structure to stand up to wind, etc.
Do you have pictures?