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Should I make a wooden frame for the fencing and attach it to the wood porch support? How strong do I need for clematis?
I was thinking something like a wooden frame attached to the porch supports, and then attaching your trellis to the wooden frame. I can't tell from your picture where you want to extend the cattle panel trellis. but if you could extend a wood frame from one post to the other I think it would work.
Most trellis stuff is not all that strong. Usually thin lathes. The wood frame, if it spans a larger distance, might be better off with something like a 1X4 ripped in half or thirds. I would think that would be plenty strong as a frame. You could paint the frame the color of the siding or your trim to blend in better.
I would not want to put holes in vinyl siding. So, I think you are on the right track about building a wooden frame across that area and then attaching the trellis to the frame. it looks like you have lots of wood posts/supports/rails to build a frame system.
As far as the vertical under the porch roof is vinyl, as is everything on the right side, you might be able to make a wooden frame that is screwed into the wood on the left side vertical post and that top rail then making the top piece and right side a type of compression fit so you would not need to screw into the vinyl. For a trellis, I think it would be plenty strong.
