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I'd screw some wooden posts onto the concrete posts and then the trellis onto those.
Thanks,
I'm going to try and see if i can drill into the posts but as the trellis needs to go along the top of the wall and the posts are not at regular intervals, with one being at more than 6ft apart the other posts well under 6ft, it would mean chopping the trellis and they want the diamond privacy type.
James, awkward one, would it be feasible to drill two holes through the wall at say two inches between the holes , thread the wire through so that the two ends of the wire are on the side of the wall that you want to attach the trellis to and twist the wire around the trellis to retain, obviously you'd have to repeat the process several times. Appreciate the rebar inside the concrete but a little trial and error you should be able to drill enough holes and will find the location of the rebars and avoid them
There's no acces to the other side of the wall as there are next door's sheds most of the way along it! They want the privacy trellis to sit on top of the wall so that it hides the sheds next door.
Thanks
James
Drilling the concrete posts would likely cause them to shatter, or you may hit the reinforcing inside and ruin your drill bits.
My suggestion - and the way we have dealt with an identical situation before - wooden posts installed in front of the concrete posts to support trellis or whatever. The wooden posts were then used to train a very vigorous clematis Monata up - it flew up the posts and covered the trellis is 18 months or so.
A gap was left behind for pruning (enough to wave a long reach hedge cutter down) to ensure said clematis didn't escape into neighbouring gardens.
Side note - you state there are neighbours sheds behind - check your local planning legisation about how high you can construct a fence on a boundary.
I would lay the trellis all along the wall & then mark where the joins will be. I would attach vertical battens to the wall to act as posts & provide spacers to allow for the capping.
Run a wall plate flush with the top of the wall 2x6 or similar and that solves the problem with uneven centres.
If the posts are unstable for fixing use an epoxy fibre plug to stabilise.
Fix your posts direct to the plate remembering to not fix the trellis to side of the post not the front or it will ruin the profile.
I'd agree with Adam Pilgrim, set post into the ground as close to the wall as possible and fix the trellis to those, you could cover the wall as well then as it doesn't look too pretty.
Have you got any metal fabricator / forges nearby? They might be able to make you a frame to 'cradle' the top of the wall and attach the trellis to.
I've had similar jobs. I'd put in wooden fence posts into the ground in front of the wall 250mm away but not near the concrete posts . Then attach trellis to the front of the posts .
I agree with others drilling the posts would be a bad idea they'll just shatter...if you try it only use drill setting and not hammeraction
I don't know why you wouldn't try threaded concrete screws into the wall. Drill a pilot hole and fire a screw in . If you hit steel it won't matter just try another spot. Then afix timbers , drill timbers first place on wall and drill through the prefilled holes put screw in timber and run in with impact drill
Does that help 🤔
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