Ventilation in new builds - are we overlooking something important?

I’ve actually run into this exact thing on a job last month. We were up there checking the decking and found the bathroom vent just dumping warm, damp air right onto the insulation.

I get what you're saying, but I’ve seen some older houses where the venting was actually run into the attic intentionally - guess it used to be code in some places? Not saying it’s right, but sometimes it’s not just laziness or shortcuts. Still, with what we know now about moisture damage, there’s really no excuse for skipping proper venting.

Still, with what we know now about moisture damage, there’s really no excuse for skipping proper venting.

Couldn’t agree more. I’ve seen the aftermath of those old setups - moldy insulation, warped sheathing, you name it. Maybe it was “normal” back then, but these days, cutting corners on venting just isn’t worth the headaches down the road. I had to redo a bathroom ceiling last year because of this exact issue. It’s one of those things that’s easy to overlook until it’s a big mess.

Funny how often venting gets overlooked, even in new builds. I’ve lost count of the times I’ve pulled up a section of roof and found insulation that looked more like a wet sponge than anything else. Folks think “out of sight, out of mind,” but moisture always finds a way to remind you it’s there. Had one job where the homeowner swore their bathroom fan was fine - turns out it was venting straight into the attic. That smell? Unforgettable… and not in a good way. Proper venting might not be flashy, but it sure saves headaches (and noses) later on.

You’re not wrong - venting is the first thing to get skipped when budgets or timelines get tight. I’ve seen “high-end” new builds with zero soffit vents and ridge vents just for show. People forget that moisture doesn’t care how new the house is. It’ll rot out a roof deck just as fast, maybe faster, if there’s nowhere for it to go. And don’t get me started on those bathroom fans dumping steam into the attic... that’s a mold farm waiting to happen. Honestly, I’d rather see a cheap fixture with proper venting than fancy finishes covering up future problems.

You nailed it - ventilation gets treated like an afterthought way too often. I’ve seen “designer” roofs with zero airflow, and it’s wild how quickly that can turn into a nightmare. Have you noticed any builders actually prioritizing venting lately, or is it still mostly lip service? Sometimes I wonder if the push for energy efficiency is making things worse... tighter envelopes, but nowhere for moisture to go.