How do I destroy spiked walls most efficiently?
The Rust wiki said that Spike Walls are structures that can be placed on various terrains (no Foundations needed). A newly placed spiked wall has 375 HealthPoint (HP). Using that information the Rust wiki has made a small diagram containing how long it would take for melee weapons to break this.
This on its own would be an answer to your question however the game has a decay feature.
After 24 hours:
After 48 hours:
The only thing the wiki states is :
So if you place the spiked wall on the ground and login after two days you could simply repair it with a few pieces of wood.
Shooting the spiked wall with a bow does actually damage the wall since arrows count as melee damage. This however is a known bug since the player does actually take damage as he would when hitting it with a 'regular' melee weapon.
When on foundations or ceilings, spike walls do not decay as they're treated as part of the house.
As stated before Explosive charges (C4) can also destroy the spike walls. The damage and amount needed are not stated on the wiki so more research is needed.