My land and house location allows for strategic position to reduce sun exposure and use of the south-south west winds: we have a large tree on the west side and I plan to place rooms strategically using, for instance, bathrooms as insulation (acoustic and heat types) on the west side. Of course, there would be other air intake from other areas.
My concern is about venting a metalsheet roof (which seems positive for its inability to store heat after). (I would use a white coating and some foam for noise.) My builder tells me that ridge vents are not possible on a metalsheet roof. If so, I am concerned that other vents will not work to evacuate hot air in the absence of wind. True?
If that is true, I would like to add a cupola (another way to vent the heat out at the top). Not possible? If not, why can't they weld a cupola structure to the steel beams?
Any other ideas to allow the heat to rise and get out, apart from putting holes into my roof? LOL Electric fans do not seem to be so economical. There are passive metal vents and, from the pictures, they seem to be able to be fitting on metalsheet: link. I hear they eventually squeak. This would be the last resort.
If it is a negative, on all counts, I just have soffit and gable vents and loads of insulation on the roof floor or in a drop ceiling seem an option (things that I would do regardless). ( I read for soundproofing that a 15 cm air gap between two layers of fibreglass and then panels would be best, which should be possible, with some modification as we are talking hanging installation: link Soundproofing for planes, chicken calls, birds, frogs,...)
I would think that this soundproofing construction would be excellent for insulation as well (for ceilings/roofs) and vertical walls as well, with a range of products to be used. ACC don't seem to be available in Chiang Mai. Not sure of the ROI of different types of double walls material: bricks VS one of ACC .
But, back to roof, I think there are 2 basic shapes of roofs (apart from flat): A shape (cheapest/simplest to build) or pyramid shape. My builder/architect tells me A shape has only 2 soffit sides. If there is no ridge vents and cupola (and no metal round vent), focussing on insulation (drop ceiling AND floor roof layers) might be the best ROI/solution!
Thanks for your ideas and advice.