Gets maybe 4 hours of direct sun march-october.

This New Dawn actually had no direct sun at all. Occasional dappled sun at best.

I moved it today to see if it will take off in the spring.

I don't necessarily care if it's a rambler or a climber, I just want it to be able to handle the height.

I really like your Red Cascade. If I was sure it would eventually hit 20ft, my search might be over.

How about Dublin Bay? I don't grow it but based on comments I have it in the wishlist for next spring.

Souvenir du Dr. Jamain is in my wish list. It may be darker than the color you're looking for, but it's fragrant and does LOVE part shade especially in hot summer.

I am sure red cascade hits 20 feet here. Like 85 to 90 percent sure. I will take a picture of mine. It's still has bloom. It's one of my favorite roses. I have mine wrapped around a rebar tepee. I have a picture on houzz,I will look for. It's raining now, so won't go get a picture now.

I would choose the shade of red carefully given your red brick house. My instinct is to stay clear of the fire engine reds, like Dublin Bay or the fabulous Cascade above. Florentina is a deeper, true red, but I think its height is 10 feet or so. It's a beautiful house and a great idea!

https://www.houzz.com/discussions/4960195/trellis-on-a-budget

Sorty, thought the picture was on there,I must have emailed it to her. Here is one I just took, not the best picture , but it's pretty big, and gets better every year. I will have to take some pictures in Spring for you

I can't seem to get it to post. Sorry houzz isacting up.

I think red cascade would definitely hit that height, I have to super hard prune mine 2 times a year to keep it on the 8 feet obelisk because I did not know how big it would get when I planted it.

Florentina would probably fit the bill if it manages to be happy with the 4 hours of sun (no experience with her in part shade). Kordes that are rated to 3 feet like earth angel are 8 feet tall in our zones. Florentina should be very large size climber if she follows how most Kordes behave in the not terribly cold zones. I have struggled to keep Korde’s happy with less than 6 hours tho so it would be an experiment for sure.

As much as I love those large petal packed blooms a climber with less petals would be able to cope with the 4 hours of sunlight better. Petal packed= lots of fuel and 4 hours of sun in zone 7a are not like 4 hours of sun in California. I am growing iceberg successfully with 4 hours of sun here but I know she is the wrong color. Nothing else here has really been happy with 4 hours except once blooming ramblers like Veilchenblau

I'm not a red rose grower, but your description made me think immediately of Chevy Chase and Excelsa. I don't know if either would fit your needs. How tall is that post? And although you specified a petal packed rose, I think it might be a fabulous place for Dortmund (a single). Too bad about the lack of sunlight. You won't get any rose to perform to its full potential with that little sunlight. An experiment, for sure, as Dianela says.

My Super Excelsas is a magenta pink, not at all the deep red I expected.

I was really interested in Chevy chase but can’t find it anywhere.

I do like the idea of a dark red best.

Also the taller the plant gets, the more sunlight it will get. Single once bloomers are perfectly fine with me, too.

I didn’t see many that were solid red. most had white or yellow centers.

Vigor and coverage are most important to me.

I had Dublin Bay and it did grow very tall in less sunlight but it grows straight up! It is very stiff and I doubt you'd be able to get it to spread along the rails. It also would only bloom at the very tips of the canes and the rest was bare. I mean bare! As in leafless.

With only 4 hrs of sun you may find roses that will grow but they may not bloom much for you.

BTW, your home is beautiful!

Kitasei my excelsas are very deep pink also and not true reds. They are great for wrapping around things with how flexible they are.

Not many solid reds in my book either jc. I am going to look for the name of a dark red Cori Ann was growing mixed with Florentina and report back. I can’t remember how big it was.

edit: https://www.helpmefind.com/rose/l.php?l=21.290219

Bloomfield Courage is spectacular, but it does have some color in the center. I am afraid with your limited sunlight you may have have to compromise in more aspects than one.

Jc, thinking about New Dawn growing on those columns, I remembered a blog I used to read. This southern gardener also grew Don Juan, a large flowered dark red climber. She gives him high praise, even in part sun. https://thegracefulgardener.com/?s=don+juan+rose Best Don Juan photos are about half way down.

I don't believe she posts anymore, but her gardens are something to behold and not just for roses. She's an artist combining evergreens, conifers and other shrubs.

Altissimo is a favorite with those who grow it.

I don't find red Cascade to be a fire engine red at all but rather a deep red that almost Fades to Black. Cadenza may also wrk depending how large it gets in your area. My experiences with Florentina is that it requires son the more the better. I had it in part shade and would get just a few blooms. I have very few roses that could do with that little Sun during the summer. One that comes to mind is Pink Ghislaine de Feligond. Chevy Chase is one of my favorite ones blooming Reds. The color is very unusual and hard to describe however. I would not call it a deep deep red.

That is how I find it as well Vaporvac.

Diane, I saw Bloomfield Courage somewhere (maybe HCR?). I think that one is the leader at the moment. I have a Don Juan growing up one of my cedar trees and while it's actively growing and the blooms are great, it doesn't flower much.

Can't tell if it's because it's shaded or because of all the root competition.

They have been in stock at local Walmarts as bare roots the last 2-3 years, so I might try to get another one just in case.

I have a Cl Crimson Glory under a cedar tree as well that isn't taking off much, either.

I that one vigorous enough to get some growth on the railings?

It's about 22ft from the soil to the 2nd level.

Vapor, I like the look of Cadenza, too.

I need to look into that one more.

If there is a white rose that would fit the bill, I'd be interested in those, too.

I'd prefer to stay away from any soft colors that might be too feminine.

If you would work with a white rose I would recommend Sombreuil rose from the antique rose emporium. The one that used to be sold under colonial white. It is supposed to do very well in partial shade and I know it can get large. I do not think it is too feminine by any means.

I wonder if Russell’s Cottage Rose would work? I don’t know what the sun requirement of this rose is, though.

If it is white and packed with petals you want, then Sombreuil might be the one you are looking for. It is thorny though, but so is New Dawn. Wonderfully fragrant.

https://www.houzz.com/discussions/2138607/sombreuil-od

If you are willing to settle for a semi-double, plant pathologist & garden writer Cynthia Westcott had the highest praise for the white rose City of York (aka Direktor Benschop). It has large, cupped, golden-centered blooms with a fragrance that carries, and beautiful dark green glossy foliage.

https://images.fineartamerica.com/images-medium-large-5/city-of-york-roses-living-color-photography-lorraine-lynch.jpg

https://www.helpmefind.com/rose/l.php?l=21.60162

https://twitter.com/PennAllenwrites/status/1257557336450830337?s=20 (picture has yellow cast)

I grew Chevy Chase for years. It is an intense, vibrant, cherry red. Every year it throws up numerous canes from the base rather than building growth on established structure. Think of a fan, everything from a central point with very little branching.

When it is in bloom (a month or so) it is simply stunning. When it is done, you will need to prune a couple times a season to keep it from being just a mess. No scent, but with its glorious color and (in my climate) impressive disease resistance, I found that easy to forgive.

In addition to color and habit, I should think another important trait to consider in such a close-up position is hygiene. You won't be able to deadhead it, will you? How do each of these roses look as their blossoms fade?

I’ll be able to deadhead.

But that does have me set on a once bloomer now haha

I am kind of rooting for 'City of York' because it would be beautiful festooning horizontally along the second storey, harmonizing with your restrained, formal white trim and black shutters. It is fragrant, and when not it bloom has healthy, shiny, dark green ornamental foliage. You wouldn't have to deadhead, because it has plentiful ornamental red hips in fall, and it grows and blooms well in shade. Photo from Garden State Roses blogspot http://gardenstateroses.blogspot.com/2012/05/ 
But I like other roses mentioned here, too, such as 'Red Cascade.'

monarda, I think you've talked me into it.

Roses Unlimited is the only nursery selling it that I recognize.

Is she open in 2021? Last I remember posters were nervous she might close soon.

She also has Bloomfield Courage, Heidelberg and Jules- those last two fit the bill but I've never heard of them.

Cori Ann grew BC and it was gorgeous. I'll see if I can find a link.

I figure if I'm ordering 1, I might as well get 4 since the shipping is the same.

I'm sure that makes sense.