YesFor a potato shed I've been told that wooden purlins are better due to condensation. However at 20 ft bays do I need to worry about sagging
What about the rest of the timbers further up the slopeA steel eaves rail on 20ft bays will prevent the wooden purlins sagging. Think ours is 9" x 5" rsj
What about the rest of the timbers further up the slope
The edges are not galvanised as the purlin when in flat form is slit from a wide coil so raw edges A well ventilated cattle shed with a high roof should not be a problem,in my opinion steel roof sheets and zeds are not the best combination as a lot of drilling swarf remains under the sheet on top of the zed and steel sheets tend to have a wide flat pan and trap moister in between the two most metal roofs that rust always start at the purlin line but not so with fibre cementDo steel purlins rust? Chatting a guy the other day who works for a local company and they never use timber now, unless it’s specifically asked for but I think some paper work is signed so they don’t come back crying looking for compensation if it sags etc.
Every Agriculture shed going out now is with steel purlins. I asked him about them rusting in an Agriculture environment and he replied with “they are galvanised” so shouldn’t and no one has complained about them rusting.
Isn’t that the whole point of galavinising or am I missing something?