It is high-quality to add foam board above the roof deck Despite the closed cell foam-board (what style?) on the interior. Roof decks are not able to dry to the outside as a result of 0.one for every shingles anyway, significantly because in zone five it's going to invest a significant length of time included in snow/dew/rain Together with the humidity generate heading inward, not outward.
It's really a code violation to put in an air-permeable insulation like fiberglass batts among unvented rafters. It is also a foul concept, simply because humidity can accumulate on the roof sheathing if you are attempting this technique, and you may end up getting sheathing rot.
I live in northern Vermont, and I haven't got adequate encounter with air-con to reply your dilemma about condensation on interior ducts.
BTW, with the foam form, I'm leaning toward XPS due to the fact one) I provide the impact that ISO is to some degree fragile, like if it receives at all damp, and a couple of) the possibility of long run outgassing with ISO. With any luck , any such outgassing would go upwards and outwards as an alternative to downwards into the house interior, but the chance that it will outgas into the interior definitely problems me.
When they have been venting the dryer within (code violation?) and also have an hooked up greenhouse I bet the partitions are moldy much too. Start out during the laundry space with its fantastic moisture position source "dryer".
humidity to flow out of one's ceiling. The point is to test to take care of any moisture that makes its way there in spite of
During the absence of an airtight ceiling, roof ventilation can perform additional damage than excellent, due to the fact air movement in rafter bays can stimulate indoor air to leak via ceiling cracks.
My feeling is that if we're worried about air leakage compromising the insulation's success, vent channels are problematic.
I are already utilizing rigid breadboard model expanded polystyrene in the rim joists and imagined the same could be set underneath the sheathing in between the rafter bays, and with any gaps sealed using a urethane spray foam such as Fill and Seal. Is there a high quality which makes spray foam satisfactory and rigid foam unacceptable?
Confident the instance shown is for just a minimal pitch (not flat) roof. But change it to the pitched roof a lot less than 6-12 and the small print are still a reference superb technique (I believe).
I previously sprayed and Slash cobbled four inch of closed cell. I'll redo the roof following yr, but I suppose now it is too late to think about eps/iso in addition to roof given that i currently unvented the attic.
I haven't got experience making while in the Carribbean or making metal structures, so I am not the very best particular person to remark. But here are some reflections:
If you intend to create a ventilated insulated sloped roof assembly, opt for Bonuses a variety of air flow baffle that may be put in within an airtight manner. Web site-built baffles are greatest.
If you need to do it appropriate, you should address air leaks, address your recessed can issue, and increase plenty of R-value to at the very least satisfy least code needs. It is many perform, but it's actually not rocket science. Fixing these troubles may be high-priced, however.