When we replaced the main wooden sup-structure structure on our part-brick greenhouse some months ago we used Coroline corrugated bitumen roof sheeting - we got the roof on and had to pause for a while before completing the walls:
At the time it seemed a good idea to throw a membrane (big plastic sheet) over the roof frame underneath the roof sheets - insurance against leaks and bugs. Now that we are thinking of insulating the roof between the rafters I am realising I may have shot myself in the foot since that would be a 'cold roof' which needs to breath.
Should I actually be concerned and is there a simple fix or a way to work around it (ventilation presumably)?
At the time it seemed a good idea to throw a membrane (big plastic sheet) over the roof frame underneath the roof sheets - insurance against leaks and bugs. Now that we are thinking of insulating the roof between the rafters I am realising I may have shot myself in the foot since that would be a 'cold roof' which needs to breath.
Should I actually be concerned and is there a simple fix or a way to work around it (ventilation presumably)?
