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Ceiling Construction Question

Hi all,

I read Rod Gervais' book, second edition. In the book, he discusses securing 2-3 layers of gypsum between the ceiling joists to add mass to the ceiling and then caulking around the gypsum panels to secure and seal. My questions are: should I use Green Glue caulk for the caulking around the panels or just regular caulk, and is there any benefit to using Greenglue compound between the panels as described for wall assemblies, but not here?

Thanks! Sorry if this question has come up before, I couldn't find it in a search.

HELP!, roof/ceiling venting plan, is this an isolation disaster?

I am having a back garden practice/recording cabin built. Structure will be (from outside to inside)

Concrete base with DPM
timber frame (total area 4x5m)
OSB with 18 mm shiplap cladding
4x2in wooden studs
100mm RW3
2 layers of 15mm acoustic plasterboard.

OSB covered with EPDM

I was quite concerned when I saw how the roof has been put up with roof joists on top of walls and a huge ventilation gap from one side of room to other(see pic).

Adjustable reflective ceiling

I'm building a live room for my studio. The room is a former bedroom and the dimensions are not ideal. (8'2" H x 12'1" x 12'9 1/2", plus a small alcove that was a closet with bifold doors. Doors have been permanently removed.) I do have the ability to completely rip it apart and rebuild it, but due to budget constraints, that will have to wait. For now, I'm working with what it is.

Primacoustic Nimbus Ceiling Cloud - Anyone Have One?

I was looking at these ceiling clouds by Primacoustics...they measure 24 inches x 48 inches x 2 inches

Perfect for the area I want to cover above my mix position

Has anyone out there had any experience with or used / currently using this one?

What attracts met to this particular one is not only the size, but its lightweight construction and ease to fit.

I'd be happy to hear from any members who may wish to chime in with their thoughts or ideas on how effective this particular type would be, or if there is something similar they could recommend.

Ceiling Fans & Feedback

Can a bank of ceiling fans being turned on or off mid-way through a venue cause a change in the way a room responds to or reflects/absorbs sound waves, thereby causing feedback problems?

Someone keeps blaming the fans for the sound troubles occasionally experienced at a church I attend. Is this a possibility? I want to give a "sound" and professional answer. I have a hard time believing the fans are truly the cause, but I've been wrong before.

Having trouble with low ceilings and vocals.

I moved my entire studio into a bedroom that has really low wood ceilings (7-8 feet). My vocals and acoustic guitars seem to have a lot of bass. I'm using a RODE ntk. Do you think I should move it to an area where there is vaulted ceilings? The room its in now is probably the quite room in the house. Would using an eq fix the problem?