Hello
I have a newly plastered wall, and it's made of old natural stone under the plaster, so the top of the wall is natural stone, which makes it difficult to drill/attach to. It looks like a roller coaster on top, as you can see in the picture next to the metal sheets on the left, but that's solved with the large metal sheet I plan to use, as you can see to the right of the small one. The question is how I can best attach the metal sheets given that there are different levels on top of the wall, making it difficult to attach. I was thinking if I lay a wooden batten all the way up top and level the entire way and attach it in the joints between the stones, then drill the sheet into it, so it hangs over the wall, what do you think?! How can I do it? Please zoom in on the pictures to see more of what I mean.
I have a newly plastered wall, and it's made of old natural stone under the plaster, so the top of the wall is natural stone, which makes it difficult to drill/attach to. It looks like a roller coaster on top, as you can see in the picture next to the metal sheets on the left, but that's solved with the large metal sheet I plan to use, as you can see to the right of the small one. The question is how I can best attach the metal sheets given that there are different levels on top of the wall, making it difficult to attach. I was thinking if I lay a wooden batten all the way up top and level the entire way and attach it in the joints between the stones, then drill the sheet into it, so it hangs over the wall, what do you think?! How can I do it? Please zoom in on the pictures to see more of what I mean.
Building conservationist
· Malmö
· 256 posts
Lay long boards vertically about 5mm above the highest point, tighten them as needed with screw clamps (available for rent), pour in mortar the same as you plastered with. Smooth it out with a short piece of board.
Since it looks like you're in a warmer country than Sweden, I'm not sure about the drying time. It also depends on how thick you need to lay it, but after about an hour, you can scrub it. Then you can wait 1-2 more hours and remove the boards. Now the mortar will be outside on the sides instead, but then you just scrape it off and add a little extra. Let it dry for 10-15 minutes and feather it into the old with a float board.
If you do it straight enough, it should be enough to glue the sheet metal as well.
Since it looks like you're in a warmer country than Sweden, I'm not sure about the drying time. It also depends on how thick you need to lay it, but after about an hour, you can scrub it. Then you can wait 1-2 more hours and remove the boards. Now the mortar will be outside on the sides instead, but then you just scrape it off and add a little extra. Let it dry for 10-15 minutes and feather it into the old with a float board.
If you do it straight enough, it should be enough to glue the sheet metal as well.
How thick is the wall... or have you chosen to forego the option of covering the top with tiles? Single-tile roofing is much more appealing than metal on such a wall (in my opinion). Then the top doesn't need to be completely horizontal either; having it undulate a little just looks nice!
Building conservationist
· Malmö
· 256 posts
What a miss 
it looked so Spanish and we haven't seen blue skies here down south for a while now. Nice asphalt too.
Ah well, we're doing fine here down south.
it looked so Spanish and we haven't seen blue skies here down south for a while now. Nice asphalt too. Ah well, we're doing fine here down south.
-RB- said:
Well, I think this is in northwestern Skåne. So yes, you're right. A bit warmer than in Sweden