(I've-done-a-search-disclaimer-with-apologies)
I've just bought an older butty, about 22 feet of interior space, currently empty inside, all windows and portholes are non-opening (but this will change eventually). I will be getting a stove but don't plan on having gas on the boat and won't have a shower. I'll soon be in possession of two mushroom vents, and was assuming that the best placement would be at the highest point of the roof, with one sort of in the middle of the front half of the boat and the other in the middle of the back half of the boat. (also no interior bulkheads on the horizon.)
I've been trying to look at other boats and in photos, and thought that my only concern would be how many would be 'correct', while wondering a bit at people's placing them at anything other than the highest point - where heat and (not condensation, but moist air...?) will be headed. However, I just got a copy of the Narrowboat Builder's Book, and his are all on the sides/edges, and he explains why (boiler, etc, and then not wanting a cluttered/chaotic looking roof).
Other than that sort of thing - equipment that must be vented and aesthetics - can anyone enlighten me about best practice with mushroom vent placement, with explanations of 'why'? Are people 8% more likely to slip off their roof if vents are down the centre, or does any one placement give better/worse ventilation or limit roof usage (if one were to use the roof as a crap-storage area or sundeck or whatever - or solar panel placement, stick-on or otherwise)? Opinions? Preferences? Word of God?
cheers.
(edited cos of inarticulateness issues.)