Catio - helping my cats not plunge to their demise
I have a terrace that I need to cat proof (7th floor) - the cats are cute, but their desire to survive until tomorrow appears to be limited.
The challange is that its open up top. (It's L shaped with the dimensions being - 'wdier' width 3.5m, one of the short walls 4.4m, long wall, 5.9m, 'narrow bit' width 1.9m, the other short wall 1.5m. The outer wall is about 1m tall. It has a bit of overhang metal sill, about 0.5-1cm so the beams would either needs to stand just tiny bit away, or Id need to cut the sill)
I came up with a rough idea of a 'pergola' like structure to put the net on. I attached the early 'design draft', but there a few things that I wonder about:
1. Stability- it is 7th floor and it can get windy at times. This desing would 'interlock' against the walls, but I presume that is enough. Securing it to the walls, would be the best bet (floor is concrete slabs laying on styrofoam base, so not quite ideal). The problem is that depending on what I intend to do the building coop might need to give me a permission and they are very relucatant to give permission for anything so the default is a no.
Is there any way I can build this safely without attaching it to the exterior of the building? Since I do not need permission to just put something on my terrace that just 'stands there'
Or at least can I argue reasonably that it does not need to be attached and then once I get permission or get told I do not need one, build it and bit later attach it in some inconspicuous manner. I have a strong suspicion that the coop likes the 'dont ask dont tell'. But the project is a bit too bit and too expensive to just ignore them altogether in case they ask me to dismantel it.
2. Cost / Complexity - the prices of any work done have gotten out of hand here and I'm concerned about how much it might cost to hire someone to do it. I am quite handy, but have not done that kind of projects yet - it does feel fairly straightforward with those metal joints https://a.allegroimg.com/s128/117f3b/f0a396c8423fbcf292ab88a15561/Lacznik-do-kantowek-belek-altan-pergoli-90st-naroznik-7x7cm-antracyt-Suki . The one challanging aspect would be keeping it level since terrace has a gentle slant to help with drainage. Am I right to think its something I could do myself, acquiring limited selection of tools? (I am considering going on a few day woodoworking course to help with that)
Would it perhaps make sense to build it myself and then hire someone to secure it just to be certain? Chemical anchors in concrete do not seem like a rocker science, but maybe there is more to it than I think?
3. Anything I am missing in the design? Its early draft and I know i might need cross beams to help with the net sagging etc. I'd also like to put in a curtain on the sides to provide shade etc. But generally any comments are welcome