First, get a big fan or a wind tunnel and push air the way a storm blows. Measure how much wind pressure the bark wall can hold before it starts to buckle or peel. Then, stack some stones on top of the wall and see how many you can put before the structure gives. That’s your real‑world load test. For numbers, a 20‑mph gale (about 9 m/s) gives roughly 250 N/m² of pressure. If your shelter is 10 m², you’re looking at about 2,500 N of force to stay solid. Aim to push that up by 50‑100 %—so design for around 3,500 N to be safe. Think of the bark as a living, flexible wall that needs to flex, not break, when the wind hits. Get a few practice storms and you’ll know when it’s ready.