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Thanks. I realise the ratio is low, but I have never handled 100mm insulated panels so have had to rely on others' comments which have mostlhy been how little they bend. I have a good idea how to proceed now, so thanks to all for the replies. :)

Yes, the idea is to pack up the purlins to suit, but was trying to work out by how much and that depends on their flexibility, hence my question. The manufacturers seem reluctant to quote any figures regarding how much they will flex and just stick to the "must be flat" line which is not...

So a 100mm insulated panel will bend 10mm in 1.2m? I'm surprised it will go that far, but good news if it does. You are sure about that?

Planning on using something like Kingspan panels for a workshop building, each panel about 5m long. How bendable are they? I realise they are pretty rigid, but how much can they actually bend over that length? The problem is that the eaves 'plate' is possibly 10mm higher than the plane of the...

Could you be more specific about the NRVs and relays. I know what they are, but would appreciate confirmation of their function in such a system. Also, 'thermoelectric actuators'? Not familiar with those.

Having had numerous problems with motorised valves in the past (mostly due to poor design IMO) I was delighted to read about the Grundfos Pump Plan that not only uses 2 pumps that I think is a great idea, but also eliminates the need for any motorised valves. But as many of you will be aware...