Second floor of garage into a coop

[Scubamama]

Unfortunately, I have not received a single positive response or responses from people that have not read my detailed description. It has electricity and We are able to provide proper heating and cooling as necessary and the garage is basically unused except as a giant storage shed. No fumes and we’d only be in there for th birds so smell isn’t an issue. We were originally going to convert it to a studio apartment to rent before deciding this might be the best option for our current needs. If it’s suitable for human residence, other than the stair issue for the ducks, I don’t see why it’s not suitable for domestic fowl?

 

[DobieLover]

Unfortunately, I have not received a single positive response or responses from people that have not read my detailed description. It has electricity and We are able to provide proper heating and cooling as necessary and the garage is basically unused except as a giant storage shed. No fumes and we’d only be in there for th birds so smell isn’t an issue. We were originally going to convert it to a studio apartment to rent before deciding this might be the best option for our current needs. If it’s suitable for human residence, other than the stair issue for the ducks, I don’t see why it’s not suitable for domestic fowl?

You haven't gotten a positive response because the vast majority of members that visit this particular forum have years of experience keeping chickens and what you are describing isn't conducive to the well being of the flock or the keeper. Sorry. You asked for our opinions and they are what they are.
If you are only using the garage for storage, why not use the upper level for the storage and keep the birds on the ground? That make more sense to me. You would just need to address the ventilation issue to ensure there was a huge amount of fresh air circulating in the garage then you could simply attach a properly sized run for the birds outside.
You don't even have to convert the entire space into the coop. Just give the chickens about 4 sq ft per bird with around 1' per bird of roost space properly positioned in the coop and 1 nest box per 5 birds. You could even have a separate section for the ducks. It's just so much easier keeping the birds on the ground and storing all the items upstairs.

 

[~KH~]

In addition to the difficulty of properly venting that type of space, I would be concerned about a toxic dust composed of dust from the bedding, dust from the feathers, and dust from the dried poop infiltrating every crack and crevice and sifting down into the garage.

Wood plank floor is not watertight and if it's not watertight it's not tight against that kind of dust particle. Consider what you'd be breathing every time you went into your garage.

This is what would concern me. Brooding chicks in the garage for the short period of time required creates a *huge* mess just with all the dust they produce...I can't imagine keeping a flock in there. I never realized just how much dust chickens create til I owned them.

 

[3KillerBs]

... If it’s suitable for human residence, other than the stair issue for the ducks, I don’t see why it’s not suitable for domestic fowl?

If you were to inquire of agricultural scientists, you'd find that human houses are incredibly unsuited for the health and well-being of livestock. I've seen it quoted in an ag textbook that if you tried to raise calves in your living room they'd die from issues arising from bad air and insufficient ventilation.

An HVAC system simply doesn't provide the masses of fresh air necessary to maintain animals' health. Nor could the filters in that system cope with the animal dust.