Good call on the attic check—been there myself and found a damp patch weeks later. One thing I've wondered about though: has anyone tried those vent caps with built-in screens to keep critters and debris out? Seems helpful, but I'm curious if they mess with airflow or cause other issues down the line...
I've installed a few of those screened vent caps for customers, and honestly, they're pretty handy for keeping out leaves and critters. Haven't seen any major airflow issues myself, but I have noticed that if the mesh is too fine, it can clog up with debris over time—especially if you're in an area with lots of trees or pollen. That buildup can restrict airflow eventually, so you might need to check and clean them periodically.
One homeowner I worked with had squirrels nesting in their vent stack (no joke), and after we put one of these caps on, problem solved. Just make sure you pick one that's designed specifically for plumbing vents—some generic ones might not have the right airflow design. Overall though, I'd say they're worth a shot if you're dealing with critters or debris regularly. Good luck with your DIY project...sounds like you're on the right track already!
I've seen those screened vent caps work well in some cases, but honestly, I'd be cautious about recommending them universally. While they do keep out critters and leaves, I've encountered situations where even moderate debris buildup caused noticeable airflow restriction. This can lead to slow drainage or even sewer gas backing up into the home—definitely not pleasant.
One homeowner I worked with had installed a fine-mesh cap himself, and within a year he was dealing with sluggish drains and weird odors. Turned out pollen and tiny leaf fragments had clogged the mesh almost completely. We ended up removing it altogether and switching to a vent cover with larger openings designed specifically for plumbing vents. It still kept out squirrels and birds, but allowed enough airflow without constant maintenance.
If you're set on using a screened cap, just make sure you're prepared to climb up there periodically to clean it out...otherwise you might end up creating more problems than you're solving.
Had a similar issue at one of my rentals a couple years back. Tenant kept complaining about slow drains and weird smells, and I couldn't figure it out until I climbed up and checked the vent. Sure enough, the mesh cap I'd installed was clogged with pine needles and dirt—total mess. Switched it out for one with bigger openings, problem solved. Honestly, unless you're cool with regular rooftop adventures, I'd steer clear of fine mesh covers altogether...
Yeah, those fine mesh covers seem like a good idea at first, but they're honestly more trouble than they're worth. I've seen a few setups where folks used them thinking they'd keep critters out, only to end up with venting issues because of debris buildup. If you're worried about animals or leaves getting in, maybe consider something with wider openings or even just regular check-ups—though climbing roofs isn't exactly my favorite pastime either... Better safe than sorry, right?
