Help me design a safe outdoor cat bridge from a second-floor balcony to a plum tree — 7.4 m span

Hello everyone,

I would like some practical advice on designing a safe outdoor walkway for my cat between my balcony and a plum tree.

The balcony is approximately 3–3.2 metres above ground level. I have not been able to measure the exact height yet because it is currently raining. The plum tree is approximately 7.4 metres horizontally from the balcony.

In the past, there was a grapevine growing between the balcony and the tree. My cat used to climb into the plum tree, and the grapevine provided a stable route/support between the building and the tree. The grapevine no longer exists, so I am looking for a simple replacement.

I am not trying to build a walkway for people. It would be used only by one domestic cat. However, I want it to be reasonably safe, weather-resistant, and able to tolerate wind and storms without damaging the tree or putting excessive force on the balcony.

My main questions are:

I don't have a lot, but , it is good to use some sintetic grass to staple around the stairs for grip? Like when it rains or snows the cat can walk safely. Thanks!

I am looking for a simple, low-cost design, but I do not want to save money by using unsuitable rope, weak hardware or an unsafe tree attachment.

Thank you in advance for any advice, criticism or alternative ideas.

The big engineering challenge will be how the tree moves. Think about that.

This is a huge engineering challenge and the cat has nothing to do with it. It will have to handle high wind loads, UV light degradation, the swaying of the tree....and if you have snow forget about it.

Pics or a drawn diagram would help.

Use a piece of the fabric they make fence privacy screens from, 8m long, to go from the balcony to the tree and about 1m wide. Along the long edges add grommets/eyelets, through which you can thread galvanized steel rope. Attach the ends of the rope to the balcony and the tree, 60-75cm apart, thereby creating a trough through which the cat can walk.

Since the fabric is like a mesh the cat can dig his claws into it for grip. When attaching the rope to the tree do it in a loop around stout branches so that it can move easily under wind load. It will catch snow but the mesh will allow the snow to melt through the material.

That would be my approach.

Put a high-angle roof on it as is traditional in snowy regions. You could design that to assist with support.
But the span, size, and materials you likely use make this a pretty big challenge. Then add how to mount it and allow for tree movement.
Plus if you do figure it out the cat will climb down the tree and run off.

I approve, with one modification to your recommendation: run the galvanized steel rope thru cut pieces of garden hose, then make the loops around the branches - so the rope loops done cut into the branches.

I would make it a tube of fabric or net so it's compliant against wind and tree movement

Use a good outdoor rope and hang it between the tree and your balcony. Everything will hang from that. The walkway is a series of boards approximately 25cm by 1m. Get some good outdoor fabric and cut it into sections that are the length of the board and approx. 60 cm wide. Those are going to hang over the rope then staple into the edges of the boards. Basically you'll get a series of 1m long tents with a wooden floor hanging from the rope by the fabric.

I'd probably just build a rope bridge for that distance.

Thanks for all the responses guys!

An excellent idea! I will admit that in my mind I was using pvc-coated galvanised wire for this project, which would render the garden hose somewhat superfluous, but there's nothing wrong with adopting a belt-and-braces approach.

something analogous to [this] (https://m.media-amazon.com/images/I/71xxT4ZodZL._AC_SY300_SX300_QL70_ML2_.jpg), quiet easy diy. Use plastic rope and hardwoord slats for weather resistance