New Chicken coop

[3KillerBs]

depending on how many birds are going into his coop, he might not need that much venting. cross breezes between the covered gables might be sufficient.

if he needs the additional venting, then yes, overhangs on all sides are must haves.

Excellent ventilation is always good. There's no such thing as too much as long as it's draft free.

This diagram is from an article on cattle barns, but the principle holds:

You need to plan for BIG overhangs, more that usual. Get that water away from the chicken ground!

A good point.

Architecture in all rainy areas always features large roof overhangs.

 

[Windrider]

Okay, just remembered that you wanted a walk in coop. This is what I was thinking of as a modified Carolina Coop for your area. You could modify further by not raising the coop:

https://www.backyardchickens.com/threads/my-carolina-coop.1459400/#post-24304575

Look at those lovely overhangs!

 

[aart]

if he needs the additional venting, then yes, overhangs on all sides are must haves.

IMO/E any building without roof overhangs is ridiculous, it protects the sides of the building. For a coop anywhere, overhangs are a good thing.

 

[DickMidnight]

IMO/E any building without roof overhangs is ridiculous, it protects the sides of the building. For a coop anywhere, overhangs are a good thing.

they seem to be a much bigger deal on chicken coops than they are on houses.

is that just because of protection for open ventilation?

 

[aart]

they seem to be a much bigger deal on chicken coops than they are on houses.

is that just because of protection for open ventilation?

On coops it's definitely weather protected ventilation,
as well as protecting building sides, shunting roof run off away(gutters stink), shade...
...plus they look better.
Buildings without decent roof overhangs are just fugly
(obviously my own preferred aesthetics).

 

[DickMidnight]

Buildings without decent roof overhangs are just fugly
(obviously my own preferred aesthetics).

haha then you’re not invited over to my fugly house anytime soon.

 

[Alex S]

My biggest concern if I lived in your climate would be how to keep the coop and run as dry as possible. I mean, Seattle and its environs are the butt of weather jokes all the time:

What do you call two straight days of rain in Seattle? A weekend.
It only rains twice a year in Seattle: August through April and May through July.

"I can't believe it," said the tourist. "I've been here an entire week and it's done nothing but rain. When do you have summer here?"
"Well, that's hard to say," replied the local. "Last year, it was on a Wednesday."

All joking aside, your biggest priority will have to be keeping the chicken area dry and ventilated or you will get discouraged by how stinky they will be. It will be a challenge in your climate. You are on the right track to look at a coop with a covered run combo.

Something along the line of Carolina Coops would work for a small number of chickens, and some here on BYC have used that plan as inspiration and gone bigger or modified it for their climate. You need to plan for BIG overhangs, more that usual. Get that water away from the chicken ground!

Why the need for such big overhang? Why not just cover the vents with metal flashing/drip edge?

 

[DickMidnight]

Why the need for such big overhang? Why not just cover the vents with metal flashing/drip edge?

you want to be protected against wind-blown rain and snow.

plus, anything blocking your ventilation is working counter to what you’re trying to achieve.

 

[Alex S]

you want to be protected against wind-blown rain and snow.

plus, anything blocking your ventilation is working counter to what you’re trying to achieve.

Well, it's not blocking it, it just prevents rain from dripping in. And why not just put a slanted vent in? I don't have any fly rafters in my coop and water has never gotten in through the vents

 

[DickMidnight]

Well, it's not blocking it, it just prevents rain from dripping in. And why not just put a slanted vent in? I don't have any fly rafters in my coop and water has never gotten in through the vents

i looked into vents like this when i was figuring out how to vent my coop and keep the rain out but quickly found out that my square footage of ventilation was cut down to square inches.