Are overlapping surfaces of Weathering Steel a concern?

Yes, however, the unique design of Sierra Steeltiles virtually eliminates this condition as there is only a limited amount of edge contact that does not trap nor wick water. Normally overlapping surfaces, like side laps along a corrugated metal roofing panel, naturally siphons water up between the layers through capillary action, resulting in  “rust packs.”

It is advised that at flashing overlaps at valleys and wall flashings, etc., a sealant be applied along the joint to stop water intrusion by capillary action.