Thanks for replies.
Having slept on it, I’m in two minds if I should put a membrane on or not now….Would it be better to have a bit of air flow to help with ventilation or is it better to seal it all off?
Tyvek is coming in around £100 for a 50m roll.
Seen THIS on ebay, would it be ok to use?
Re the insulation, I was thinking about getting the 40/50mm kingsan type seconds and leave an air gap between that and the membrane/boards. Would that be the way to go with that?
Shed will be around 4.5m x 3m and around 2.3m high pent roof at the highest point.
No pics yet, trying to work out the budget for everything and see what I can/cant afford!! Hope to start next week.
Next issue, is what roof covering…..see the threads about EDPM and that does look good but not sure if I can afford that over mineral felt…