Need advice on replacing an old leaky roof

Mixing vented and unvented isn’t always the boogeyman folks make it out to be, especially with older homes where you’re working with what you’ve got. I’ve been down this road - sometimes you just can’t get a perfect match across every roof plane. If you’re meticulous with air sealing and don’t cut corners at those tricky transitions, it can work out just fine. Honestly, patience and a sharp eye for detail go a long way. Don’t let anyone tell you there’s only one “right” way when it comes to retrofits like these... sometimes the hybrid route is the only one that makes sense.

I hear you on the hybrid approach, and yeah, sometimes you have to get creative with old houses. That said, I’ve seen a few jobs where mixing vented and unvented led to condensation headaches down the line - especially in spots where air sealing wasn’t up to snuff. Like you said, “

patience and a sharp eye for detail go a long way

“those transitions can be a pain to get right every time”

“ended up chasing down mystery drips for weeks. In hindsight, sticking to one system would’ve saved a lot of headaches”

That’s my worry, actually - if you go with just one approach, is it always possible with complicated framing? Or do you end up paying more trying to force it? I’m trying to keep costs down but don’t want to be patching leaks every year. Anyone ever regretted going “all in” on one system, or is it usually worth the upfront hassle?

“is it always possible with complicated framing? Or do you end up paying more trying to force it?”

I’ve wondered the same thing. Sometimes it feels like you’re just trading one headache for another. But honestly, I’d rather deal with a bit more hassle upfront than keep shelling out for patch jobs every year. My neighbor went all in on one system and hasn’t had a single issue... makes me think it’s worth the initial pain, even if the framing’s tricky.

“I’d rather deal with a bit more hassle upfront than keep shelling out for patch jobs every year.”

That’s pretty much my take too. Complicated framing can be a pain, but if you get the right system and install it properly, you’re saving yourself a lot of future headaches. I’ve seen people try to cut corners and it just leads to weird leaks in places you’d never expect. Sometimes it’s worth biting the bullet and doing it right, even if the framing’s a puzzle. Just make sure whoever’s doing the work actually understands the quirks of your roof - seen too many “pros” get tripped up by odd angles.

Honestly, I’ve seen more issues come from rushed jobs than from taking the time to work through tricky framing. If you’re dealing with odd roof geometry, it’s worth making sure the crew has experience with that type - some guys just aren’t used to anything but standard pitches and it shows in the details. Last place I worked on, we had to redo a section because someone tried to shortcut flashing around a dormer... ended up costing way more in the long run. Better to get it right the first time, even if it means a few extra days of work.

Title: Need advice on replacing an old leaky roof

That’s a solid point about not rushing, especially with weird roof shapes. I’ve seen crews try to “make it work” with non-standard valleys or dormers, and it just never holds up. Sometimes folks think they’re saving time or money by skipping a step, but water always finds the weak spot, right?

One thing I’ve learned - if you’re dealing with anything out of the ordinary, it pays to have someone walk through the plan step by step before anyone even touches a shingle. I usually ask for a quick mock-up or even just a sketch, just to make sure everyone’s on the same page. It might feel like overkill, but it’s way easier than fixing a leak after the fact.

You’re right, taking a few extra days upfront is nothing compared to the headache (and cost) of redoing it later. Even if it means the job stretches out a bit, it’s worth it for peace of mind.

Sometimes folks think they’re saving time or money by skipping a step, but water always finds the weak spot, right?

That’s the truth - water’s got a sixth sense for shortcuts. I’ve seen more than one “creative” solution on tricky rooflines come back to bite people, especially when you get into those oddball valleys or where two different roof pitches meet. It’s like the roof equivalent of a handshake that just doesn’t quite line up.

I do wonder sometimes if we overcomplicate things, though. I mean, there’s definitely value in mock-ups and sketches (I’m a fan of anything that avoids surprises), but I’ve also seen crews get bogged down in planning paralysis. There’s got to be a sweet spot between “measure twice, cut once” and just standing around with blueprints until the weather turns.

One thing I’ve picked up - if you’re dealing with an older house, sometimes the original framing isn’t square anymore. That can throw off even the best-laid plans. Had a project last year where nothing was level, and we ended up having to adjust on the fly... which is exactly when you want someone who knows their stuff.

And about stretching out the timeline: it’s true that a few extra days upfront saves headaches later, but man, I’ve had clients who start getting twitchy if they see scaffolding for more than a week. There’s always that tension between doing it right and keeping everyone happy. Maybe that’s just part of the game.

Curious if anyone here has actually found a way to make those weird dormers bulletproof? I’ve yet to see one that doesn’t need some TLC after a few seasons.

Those dormers are always the troublemakers, aren’t they? I’ve seen folks try every flashing trick in the book, but it seems like water always finds a way in after a few freeze-thaw cycles. Best luck I’ve had is with peel-and-stick membranes under the metal flashing - kind of a belt-and-suspenders approach. Not exactly cheap, but it’s saved me from callbacks more than once. And yeah, old framing that’s out of whack just adds to the fun... sometimes you just have to embrace a little creative problem-solving.

Those dormers are always the troublemakers, aren’t they? I’ve seen folks try every flashing trick in the book, but it seems like water always finds a way in after a few freeze-thaw cycles.

- Couldn’t agree more - dormers are where all my roof headaches start. Even with solid craftsmanship, those weird angles and old lumber just seem to invite leaks.
- Peel-and-stick membrane under the metal is definitely the way to go. I’ve tried skipping it to save a few bucks, but every time, I end up regretting it. Water just loves to sneak in wherever it can.
- One thing I’d add: don’t skimp on prepping the wood underneath. If there’s any rot or soft spots around the dormer, even the best flashing won’t save you. I had to sister in some new rafters last time because the old ones were so out of square, nothing lined up right.
- For me, ice & water shield goes up at least 18" past every valley and dormer edge. Might be overkill, but after dealing with a nasty leak that ruined a bedroom ceiling, I’m not taking chances.
- If you’re working with old framing that’s out of whack, sometimes you just have to custom-bend your flashing on site. Pre-bent stuff rarely fits right on these old houses.
- One trick I picked up: run a bead of high-quality sealant (like NP1 or similar) behind the flashing where it meets siding or trim - not as a primary defense, but as backup if water ever gets past the metal.

Honestly, creative problem-solving is half the battle on these projects. Every roof’s got its own personality... and sometimes a bad attitude.

Yeah, you nailed it - dormers are a pain, and skipping the membrane is just asking for trouble. I’d add that using recycled or FSC-certified lumber when replacing rafters can help with sustainability, but only if it’s solid and dry. Also, I’ve found that venting around dormers is often overlooked. Without proper airflow, you’re just trapping moisture and speeding up rot. Not glamorous work, but it pays off in the long run.

Couldn’t agree more about venting - people focus on the flashy stuff and forget that airflow is what keeps everything from rotting out. I’d add, if you’re going for recycled or FSC lumber, double-check for old fasteners or hidden damage. Seen too many “green” projects get derailed by overlooked defects. Also, don’t skimp on flashing around those dormers... water finds every weakness, every time.

“don’t skimp on flashing around those dormers... water finds every weakness, every time.”

- Not sure I’m totally sold on the “more flashing is always better” angle. Seen a few high-end jobs where over-flashing actually trapped moisture and made things worse. Sometimes less is more, especially if you’re using modern membranes that do the heavy lifting.
- On the recycled/FSC lumber - yeah, defects are a risk, but honestly, I’ve had just as many issues with “premium” new stock warping or splitting after install. It’s not always about age or being green; sometimes it’s just luck of the draw.
- Venting is critical, but I’d argue insulation gets overlooked too. Too much airflow and you’re losing efficiency (and money). There’s a balance - tight envelope, smart venting, not just max airflow everywhere.
- One thing nobody mentions: gutters. If your roof leaks but your gutters are dumping water against the fascia, you’re fighting a losing battle.

Just my two cents from seeing a lot of “luxury” roofs go sideways for reasons nobody expected...

Funny you mention gutters - when I pulled off my old shingles, I found rot right where the downspout had been splashing back for years. Fixed the leak, but it was the gutter all along causing the mess.

I’ve also gone back and forth on the insulation vs. venting thing. Tried to max out attic insulation last time, but ended up with condensation issues because I didn’t leave enough airflow at the eaves. It’s a fine line.

Curious if anyone’s tried those newer self-adhering membranes under metal roofs? I’m debating if it’s worth the extra cost or just stick with the classic felt and ice & water shield combo.

Also - has anyone had luck with those gutter guards, or are they more hassle than they’re worth? My neighbor swears by them, but I’m skeptical...

NEED ADVICE ON REPLACING AN OLD LEAKY ROOF

That gutter rot story hits close to home - been there, and it’s wild how a little splashback can cause so much trouble. On the venting vs. insulation thing, I totally get the struggle. I once packed in extra cellulose, thinking more was better, but ended up with damp insulation and a musty attic. Had to pull some out and add baffles for airflow… lesson learned.

About the self-adhering membranes: I’ve used them under standing seam metal and found they really do help with ice damming, especially in our freeze-thaw cycles. The upfront cost stings a bit, but I slept better during storms knowing I had that extra layer. If you’re planning to stay put for a while, it might be worth it.

Gutter guards are a mixed bag. I tried a mid-range brand - less cleaning, but pine needles still sneak through. Not perfect, but better than nothing if you hate climbing ladders every fall.

NEED ADVICE ON REPLACING AN OLD LEAKY ROOF

Funny how we all learn the hard way about attic airflow... I thought stuffing more insulation in would be a win, but nope - just got soggy batts and that weird attic smell. On membranes, I’m with you: pricey but worth it if you’re in for the long haul. Gutter guards, though - I swear, squirrels treat mine like a buffet.

NEED ADVICE ON REPLACING AN OLD LEAKY ROOF

You’re not alone - attic airflow trips up a lot of folks. More insulation seems logical, but without proper ventilation, it just traps moisture. I’ve seen too many projects where that leads to mold or warped sheathing. Membranes are definitely an investment, but they do pay off in durability and peace of mind over time. As for gutter guards, I hear you... wildlife always finds a way. Sometimes the simplest mesh works better than the fancy stuff, honestly. Hang in there - it’s a learning curve, but you’re making smart calls.

Sometimes the simplest mesh works better than the fancy stuff, honestly.

That’s been my experience too. I tried those pricier gutter guards with all the bells and whistles, but squirrels still managed to shove acorns right through. Ended up switching to basic mesh from the hardware store - way cheaper and it actually worked better for me. As for attic airflow, I totally underestimated how much difference a couple of extra vents would make. Wish I’d known before adding insulation; had to go back and fix some spots where things got damp. Live and learn, I guess.

Yeah, I hear you on the airflow - venting gets overlooked way too often. I’ve seen folks pile on insulation thinking it’s always better, but without enough vents, it just traps moisture and causes headaches down the line. Funny thing, sometimes the “upgrades” end up being more trouble than they’re worth. I’m a fan of keeping things simple and focusing on good basics, especially with roofs and attics. Less to go wrong, honestly.