iaaeap

Hi All, I've read this thread with interest, in particular the bits about using counter battens to ventilate below a metal profile roof covering. I'm going to be doing this on a log cabin which has tongue and groove roof boards, but I'm using Cladco roof sheets rather than what the manufacturer offers, so I am trying to sort the detail myself. Cladco do not have details for installation with counter battens. I plan to install it something like the image below (not at all to scale, sorry). What I can't quite figure out is 1) how to finish the breathable membrane at the gutter end, 2) whether to have the metal sheet extend beyond the battens/wind board to prevent water running onto the battens, and 3) whether to/how to vent the ridge. On the first point, should I use some sort of strip nailed to the T&G to lap the membrane onto, so that what you see is a neat strip hanging into the gutter rather than a flap of membrane? Any suggestions for a product for this? On the second point, the counter battens and battens will be 25mm, raising the base of the roof covering 50 mm from the T&G, and owing to the 12.2 degree roof pitch also moving the lower edge of the roof covering 10mm out from the upper edge of the wind board, on which the gutter will be mounted. I'm slightly concerned that with the roof covering being at least 50 mm above the gutter and already being 10mm beyond the edge of the gutter, water is at risk of passing over the gutter, particularly if I extend the covering to prevent water running onto the battens. Any thoughts on this greatly received. I guess that if I move the lowest batten up slightly, and extend the roof covering say 10 mm beyond the line of the wind board, then the battens are safe, but am I still going to overshoot the gutter during heavy rain? Maybe that's something I have to live with? On the last point, I've seen reference to having the eaves open for ventilation (which I'll do) but to seal the ridge flashingto prevent wind driven rain. How is the roof ventilated if the ridge is sealed like this? Also, do people tend to leave a gap at the top of the roof sheets - or butt them up to each other? Any thoughts very gratefully received. Thank you.