Very good95/100
The marten defence belt is a simple way to block the animals' way to the roof. It costs only 16 euros (in a pack of two), generates no further costs and works permanently.
The climbing barrier is installed on outdoor drainpipes to effectively prevent martens from climbing onto buildings.
The system uses a climbing barrier made of mesh and spikes to create a purely mechanical block against climbing.
The guard can be flexibly adjusted to fit various pipe diameters and can be extended with additional sets for larger pipes.