Plumbing tips that change with the seasons

I get what you’re saying about drafts not being the whole answer, but I’m actually more nervous about using expanding foam or stuffing insulation in weird spots. I’ve read a few horror stories about folks accidentally trapping moisture and ending up with mold or rot. I’d rather have a little cold air than risk that, honestly. Maybe I’m just overly cautious, but it’s hard to know where to draw the line—especially when you can’t see what’s going on behind the walls.

Yeah, I totally get where you're coming from. That expanding foam can be a lifesaver for drafts, but if you go overboard or use it in the wrong spots, it really can trap moisture. I’ve seen a couple of older basements where someone tried to seal everything up tight and ended up with a mess—mold behind the walls, wood getting soft... not fun to fix.

Honestly, sometimes a little airflow isn’t the worst thing, especially in spots where pipes run through. It’s all about balance, I guess. If you do use foam, I’d just stick to obvious gaps and avoid anywhere you’re not sure about. And if you’re ever opening up a wall for plumbing work, it’s a good chance to check for any signs of moisture or old leaks before sealing things back up. It’s way easier to deal with problems when you catch them early rather than after everything’s closed up tight.

I get the concern about trapping moisture, but honestly, I think people sometimes overstate the risk with expanding foam—especially if you’re using the right type and applying it correctly. I’ve worked on plenty of houses where leaving those gaps for “airflow” just meant more cold drafts and higher heating bills, not to mention critters sneaking in. The real issue is when folks use open-cell foam in places that need closed-cell, or slap it on damp surfaces without letting things dry out first. That’s when you get mold and rot.

If you’re sealing around pipes, especially in exterior walls or rim joists, I’d argue it’s better to seal tight and then control ventilation elsewhere, like with a proper HRV system. Relying on random airflow through holes isn’t really a strategy—it’s just hoping for the best. Sure, check for leaks before you close things up, but don’t leave gaps just because you’re worried about moisture. Get the building envelope right, then manage humidity with proper ventilation. That’s my two cents, anyway...

Honestly, I think you’re spot on about sealing up tight around pipes. I’ve seen way more issues from drafts and critters than from moisture getting trapped—at least when folks use the right foam and don’t rush the job. The whole “let it breathe” thing gets tossed around a lot, but in practice, those gaps just end up letting in cold air and bugs.

That said, I have run into a few situations where someone sealed up everything without checking for leaks first, and then they had to rip it all out to fix a slow drip or condensation issue. That’s always a pain—so yeah, double check before you close things up. But leaving intentional gaps just to avoid moisture problems? Doesn’t really make sense to me either. Like you said, get your envelope sorted out and deal with humidity with proper ventilation or an HRV if you can swing it.

Anyway, I’d rather fix a bit of foam than deal with frozen pipes or mice chewing through insulation... Seen enough of both over the years.

Ever notice how “let it breathe” gets tossed around like it’s some magic fix?

The whole “let it breathe” thing gets tossed around a lot, but in practice, those gaps just end up letting in cold air and bugs.