TRUE OAK Deep 21mm Zincalume The TRUE OAK 21mm Deep Zincalume corrugated profile is a profile designed and supplied by Revolution Roofing as their standard corrugated profile roof sheeting. Revolution Roofing designed this corrugated product at a 21mm depth to create a strengthened roof sheeting with deep curves using a standard .42 gauge BlueScope Steel Zincalume. … Continue reading True Oak Deep 21mm Zincalume