It's not a fun place to work, especially if your roof is shallow pitched or if the roof timbers aren't very deep. We tend to go straight up through the roof via a multi-slate and a mush' cowled pipe.I'm trying find video or illustrations to assist without going up in the loft first
When you look at a typical eaves detail (without the battens and membrane), you'll see that there is not a lot of room to work the duct around. Some scenarios are better than others, depending how deep the roof timbers are...
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